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1. WO2012048034 - RÉSONATEUR COMPENSÉ EN TEMPÉRATURE EN BANDE LARGE ET OSCILLATEUR COMMANDÉ EN TENSION EN BANDE LARGE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is:

1. An apparatus comprising:

a first node;

a second node;

a first signal input conductor;

a second signal input conductor; and

a main varactor circuit comprising:

a first main varactor circuit portion comprising:

a first varactor having a first lead and a second lead, wherein the first lead of the first varactor is coupled to the first node;

a second varactor having a first lead and a second lead, wherein the first lead of the second varactor is coupled to the second node, and wherein the second lead of the second varactor is coupled to the second lead of the first varactor at a first control node; and

a first analog multiplexing circuit that couples a selected one of the first signal input conductor and the second signal input conductor to the first control node.

2. The apparatus of Claim 1, wherein a first analog control signal is present on the first signal input conductor, and wherein a second analog control signal is present on the second signal input conductor.

3. The apparatus of Claim 2, wherein the first analog control signal is a fine tuning control signal received from a loop filter, and wherein the second analog control signal is a signal that varies as a function of temperature.

4. The apparatus of Claim 1, further comprising:

a temperature compensation voltage generating circuit that supplies a Temperature Compensation Analog Voltage Control Signal (TCAVCS) onto the second signal input conductor, wherein the TCAVCS has a voltage that varies as a function of temperature.

5. The apparatus of Claim 4, wherein the voltage of the TCAVCS varies as a function of temperature in a first way if a digital control value received by the temperature compensation voltage generating circuit has a first digital value, whereas the voltage of the TCAVCS varies as a function of temperature in a second way if the digital control value received by the temperature compensation voltage generating circuit has a second digital value.

6. The apparatus of Claim 1, wherein the main varactor circuit further comprises:

a second main varactor circuit portion comprising:

a third varactor having a first lead and a second lead, wherein the first lead of the third varactor is coupled to the first node;

a fourth varactor having a first lead and a second lead, wherein the first lead of the fourth varactor is coupled to the second node, and wherein the second lead of the fourth varactor is coupled to the second lead of the third varactor at a second control node; and

a second analog multiplexing circuit that couples a selected one of the first signal input conductor and the second signal input conductor to the second control node.

7. The apparatus of Claim 6, wherein the apparatus is a Voltage Controlled Oscillator (VCO) that receives a multi-bit digital tuning word, wherein a first digital bit of the multi-bit digital tuning word controls the first analog multiplexing circuit, and wherein a second digital bit of the multi-bit digital tuning word controls the second analog multiplexing circuit.

8. The apparatus of Claim 1, wherein the apparatus is a Voltage Controlled Oscillator (VCO) that receives a Fine Tuning Analog Voltage Control Signal (FTAVCS) from a loop filter onto the first signal input conductor.

9. The apparatus of Claim 1, wherein the first lead of the first varactor is coupled to the first node by a first capacitor, and wherein the first lead of the second varactor is coupled to the second node by a second capacitor.

10. The apparatus of Claim 1, wherein the first lead of the first varactor is directly connected to the first node so that the first lead of the first varactor is a part of the first node, and wherein the first lead of the second varactor is directly connected to the second node so that the first lead of the second varactor is a part of the second node.

11. The apparatus of Claim 1, wherein the first analog multiplexing circuit comprises: a first transistor operative to be conductive so that it couples the first signal input conductor to the first control node when a digital control signal has a first digital value, and operative to be nonconductive when the digital control signal has a second digital value opposite the first digital value; and

a second transistor operative to be conductive so that it couples the second signal input conductor to the first control node when the digital control signal has the second digital value, and operative to be nonconductive when the digital control signal has a first digital value.

12. The apparatus of Claim 1, further comprising:

an auxiliary varactor circuit comprising:

a first auxiliary varactor circuit portion coupled to provide a first capacitance between the first node and the second node, wherein the first capacitance varies as a function of temperature.

13. The apparatus of Claim 12, wherein the auxiliary varactor circuit further comprises:

a second auxiliary varactor circuit portion coupled to provide a second capacitance between the first node and the second node, wherein the second capacitance varies as a function of temperature.

14. The apparatus of Claim 13, wherein the apparatus is a Voltage Controlled Oscillator (VCO) that receives a Fine Tuning Analog Voltage Control Signal (FTAVCS) from a loop filter onto the first signal input conductor, and wherein the FTAVCS is not supplied to the first auxiliary varactor circuit portion and is not supplied to the second auxiliary varactor circuit portion.

15. The apparatus of Claim 14, wherein the first auxiliary varactor circuit portion receives a first digital control bit that at least in part determines a magnitude of the first capacitance, and wherein the second auxiliary varactor circuit portion receives a second digital control bit that at least in part determines a magnitude of the second capacitance.

16. The apparatus of Claim 1, further comprising:

an auxiliary varactor circuit coupled to provide a digitally programmable temperature dependent capacitance between the first node and the second node, wherein the auxiliary varactor circuit receives a digital control value that at least in part determines a magnitude of the digitally programmable temperature dependent capacitance.

17. The apparatus of Claim 16, wherein the apparatus is a Voltage Controlled Oscillator (VCO) that receives a Fine Tuning Analog Voltage Control Signal (FTAVCS) from a loop filter onto the first signal input conductor, and wherein the FTAVCS is not supplied to the auxiliary varactor circuit.

18. The apparatus of Claim 1, further comprising:

a digitally programmable coarse tuning capacitor bank circuit coupled to provide a digitally programmable capacitance between the first node and the second node.

19. The apparatus of Claim 1, further comprising:

a digitally programmable coarse tuning capacitor bank circuit coupled to provide a digitally programmable capacitance between the first node and the second node, wherein the digitally programmable coarse tuning capacitor bank circuit comprises: a first capacitor bank circuit portion that is coupled to the first node and that is coupled to the second node and that receives a first digital control bit, wherein the first digital control bit at least in part determines a first capacitance provided by the first capacitor bank circuit portion between the first and second nodes; and

a second capacitor bank circuit portion that is coupled to the first node and that is coupled to the second node and that receives a second digital control bit, wherein the second digital control bit at least in part determines a second capacitance provided by the second capacitor bank circuit portion between the first and second nodes.

20. The apparatus of Claim 19, wherein the first capacitor bank circuit portion includes a first transistor that is on when the first digital control bit has a first digital value, wherein the first capacitance provided by the first capacitor bank circuit portion when the first digital control bit has the first digital value varies in a first way with temperature, wherein the first transistor is off when the first digital control bit has a second digital value opposite the first digital value, wherein the first capacitance provided by the first capacitor bank circuit portion when the first digital control bit has the second digital value varies in a second way with temperature.

21. The apparatus of Claim 20, wherein the varying of the first capacitance in the second way is at least in part due to a reverse biased diode in the first capacitor bank circuit portion, wherein the first capacitor bank circuit portion receives an analog voltage control signal that at least in part determines a capacitance of the reverse biased diode.

22. An apparatus that receives a Fine Tuning Analog Voltage Control Signal (FTAVCS) and a multi-bit digital control word, the apparatus comprising:

a main varactor circuit comprising a plurality of main varactor circuit portions that can be selectably enabled or disabled, wherein the main varactor circuit portions are coupled together in parallel, and wherein each of the plurality of main varactor circuit portions receives the FTAVCS;

an auxiliary varactor circuit comprising a plurality of auxiliary varactor circuit portions that can be selectably enabled or disabled, wherein the auxiliary varactor circuit portions are coupled together in parallel, wherein each of the plurality of auxiliary varactor circuit portions receives a Temperature Compensation Analog Voltage Control Signal (TCAVCS), wherein none of the auxiliary varactor circuit portions receives the FTAVCS; and

a digitally programmable coarse tuning capacitor bank circuit comprising a plurality of capacitor bank circuit portions that can be selectably enabled or disabled, wherein the capacitor bank circuit portions are coupled together in parallel, wherein none of the plurality of capacitor bank circuit portions receives the FTAVCS, wherein the multi-bit digital control word determines how many and which of the main varactor circuit portions, the auxiliary varactor circuit portions, and the capacitor bank circuit portions are enabled.

23. The apparatus of Claim 22, wherein a capacitance of any of the main varactor circuit portions that is not enabled is controlled as a function of temperature, wherein a capacitance of any of the auxiliary varactor circuit portions that is not enabled is controlled as a function of temperature, and wherein a capacitance of any of the capacitor bank circuit portions that is not enabled is controlled as a function of temperature.

24. The apparatus of Claim 22, wherein the TCAVCS received by the plurality of auxiliary varactor circuit portions is a second TCAVCS, the apparatus further comprising:

a first temperature compensation voltage generating circuit that supplies a first TCAVCS to each of the main varactor circuit portions, wherein the multi-bit digital control word determines how the first TCAVCS varies with temperature;

a second temperature compensation voltage generating circuit that supplies the second TCAVCS to each of the auxiliary varactor circuit portions, wherein the multi-bit digital control word determines how the second TCAVCS supplied to the auxiliary varactor circuit portions varies with temperature; and

a third temperature compensation voltage generating circuit that supplies a third TCAVCS to each of the capacitor bank circuit portions, wherein the multi-bit digital control word determines how the third TCAVCS supplied to the capacitor bank circuit portions varies with temperature.

25. The apparatus of Claim 22, wherein each of the main varactor circuit portions comprises a first varactor having a lead coupled to a control node, a second varactor having a lead coupled to the control node, and an analog multiplexing circuit coupled to supply a signal onto the control node.

26. The apparatus of Claim 25, wherein the multi-bit digital control word controls the analog multiplexing circuits of the main varactor circuit portions.

27. A method comprising:

receiving a Fine Tuning Analog Voltage Control Signal (FTAVCS) onto an input conductor of a Voltage Controlled Oscillator (VCO);

generating a Temperature Compensation Analog Voltage Control Signal (TCAVCS) having a voltage that changes as a function of temperature;

supplying a selected one of the FTAVCS and the TCAVCS onto a control node of a first main varactor circuit portion; and

supplying a selected one of the FTAVCS and the TCAVCS onto a control node of a second main varactor circuit portion, wherein the first and second main varactor circuit portions are coupled together in parallel and are parts of the VCO.

28. The method of Claim 27, further comprising:

receiving a multi-bit digital control word onto the VCO, wherein the multi-bit digital control word determines which one of the FTAVCS and the TCAVCS is supplied onto the control node of the first main varactor circuit portion, and wherein the multi-bit digital control word determines which one of the FTAVCS and the TCAVCS is supplied onto the control node of the second main varactor circuit portion.

29. The method of Claim 27, further comprising:

receiving a multi-bit digital control word onto the VCO, wherein the multi-bit digital control word determines how the TCAVCS changes as a function of temperature.

30. The method of Claim 27, wherein the first main varactor circuit portion comprises:

a first varactor having a first lead and a second lead, wherein the first lead of the first varactor is coupled to a first node;

a second varactor having a first lead and a second lead, wherein the first lead of the second varactor is coupled to a second node, and wherein the second lead of the second varactor is coupled to the second lead of the first varactor at a first control node; and

a first analog multiplexing circuit that couples a selected one of the FTAVCS and the TCAVCS onto the first control node, and

wherein the second main varactor circuit portion comprises: a third varactor having a first lead and a second lead, wherein the first lead of the third varactor is coupled to the first node;

a fourth varactor having a first lead and a second lead, wherein the first lead of the fourth varactor is coupled to the second node, and wherein the second lead of the fourth varactor is coupled to the second lead of the third varactor at a second control node; and

a second analog multiplexing circuit that couples a selected one of the FTAVCS and the TCAVCS onto the second control node.

31. The method of Claim 28, wherein the first and second main varactor circuit portions are parts of a main varactor circuit, the method further comprising:

supplying a second Temperature Compensation Analog Voltage Control Signal (TCAVCS) to an auxiliary varactor circuit, wherein the auxiliary varactor circuit is coupled in parallel with the main varactor circuit and is a part of the VCO, wherein the auxiliary varactor circuit does not receive the FTAVCS, wherein the auxiliary varactor circuit has a digitally programmable temperature dependent variable capacitance, and wherein the multi-bit digital control word at least in part determines a magnitude of the digitally programmable temperature dependent variable capacitance.

32. The method of Claim 28, wherein the first and second main varactor circuit portions are parts of a main varactor circuit, the method further comprising:

controlling a digitally programmable coarse tuning capacitor bank circuit coupled in parallel with the main varactor circuit, wherein the digitally programmable coarse tuning capacitor bank circuit is a part of the VCO, wherein the digitally programmable coarse tuning capacitor bank circuit has a digitally programmable capacitance, and wherein the multi-bit digital control word at least in part determines a magnitude of the digitally programmable capacitance.

33. An apparatus comprising:

a first signal input conductor for receiving a Fine Tuning Analog Voltage Control Signal (FTAVCS) from a loop filter;

a second signal input conductor for receiving a Temperature Compensation Analog Voltage Control Signal (TCAVCS), wherein the TCAVCS has a voltage that varies as a function of temperature; and

means for providing a first variable capacitance between a first node and a second node such that if a first digital control bit has a first digital value then the FTAVCS on the first signal input conductor is used to control the first variable capacitance whereas if the first digital control bit has a second digital value opposite the first digital value then the TCAVCS on the second signal input conductor is used to control the first variable capacitance.

34. The apparatus of Claim 33, further comprising:

means for providing a second variable capacitance between the first node and the second node such that if a second digital control bit has a first digital value then the FTAVCS on the first signal input conductor is used to control the second variable capacitance whereas if the second digital control bit has a second digital value opposite the first digital value then the TCAVCS on the second signal input conductor is used to control the second variable capacitance.

35. The apparatus of Claim 34, wherein the apparatus is a Voltage Controlled Oscillator (VCO), and wherein the means for providing the first variable capacitance and the means for providing the second variable capacitance are parts of a main varactor circuit of the VCO.

36. The apparatus of Claim 35, further comprising:

a temperature compensation voltage generating circuit that generates the TCAVCS such that if a digital control value received by means for generating has a first digital value then the voltage of the TCAVCS varies as a function of temperature in a first way, whereas if the digital control value received by the means for generating has a second digital value then the voltage of the TCAVCS varies as a function of temperature in a second way.

37. A processor-readable medium storing a set of processor-executable instructions, wherein execution of the set of processor-executable instructions by a processor is for: causing the processor to generate first control information for controlling a first main varactor circuit such that a selected one of a Fine Tuning Analog Voltage Control Signal (FTAVCS) and a Temperature Compensation Analog Voltage Control Signal (TCAVCS) is supplied onto a control node of the first main varactor circuit, wherein the FTAVCS is received from a loop filter of a VCO, wherein the TCAVCS has a voltage that varies with temperature, and wherein the first main varactor circuit is a part of the VCO.

38. The processor-readable medium of Claim 37, wherein execution of the set of processor-executable instructions is also for:

causing the processor to generate second control information for controlling a second main varactor circuit such that a selected one of the FTAVCS and the TCAVCS is supplied onto a control node of the second main varactor circuit, and wherein the second main varactor circuit is a part of the VCO.

39. The processor-readable medium of Claim 37, wherein execution of the set of processor-executable instructions is also for:

causing the processor to generate third control information for controlling a voltage generating circuit that generates the TCAVCS such that the voltage of the TCAVCS varies in a first way with temperature if the third control information has a first digital value whereas the voltage of the TCAVCS varies in a second way with temperature if the third control information has a second digital value.

40. A method of manufacturing an integrated circuit comprising:

fabricating a fine tuning analog signal input conductor;

fabricating a first varactor and a second varactor such that a lead of the first varactor is coupled to a control node and such that a lead of the second varactor is coupled to the control node;

fabricating an analog multiplexing circuit having an output coupled to the control node, and having a first input coupled to the fine tuning analog signal input conductor; and

fabricating a temperature compensation voltage generating circuit having an output coupled to a second input of the analog multiplexing circuit, wherein the fine tuning analog signal input conductor, the first varactor, the second varactor, the analog multiplexing circuit and the temperature compensation voltage generating circuit are all parts of the integrated circuit.