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1. WO2012138781 - SHAPER DESIGN IN CMOS FOR HIGH DYNAMIC RANGE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

What is claimed is:

1. An analog filter, comprising:

a chain of filter stages, each filter stage having an input node and an output node, and the output node of each filter stage in the chain of filter stages being connected to the input node of an immediately succeeding filter stage through a resistor, and each filter stage comprising an amplifier and a capacitor;

a first feedback resistor for providing a negative feedback, the first feedback resistor having a first end and a second end, the first end being connected to the output node of a last filter stage along the chain of filter stages, and the second end being connected to the input node of a first preceding filter stage; and

a feedback capacitor for providing a positive feedback, having a first end and a second end, the first end being connected to the output node of one of the chain of filter stages and the second end being connected to the input node of a second preceding filter stage.

2. The analog filter of claim 1, further comprising a second feedback resistor for providing a negative feedback, the second feedback resistor having a first end and a second end, the first end being connected to the output node of the filter stage immediately preceding the last filter stage and the second end being connected to the input node of a third preceding filter stage.

3. The analog filter of claim 1 , wherein the first end of the feedback capacitor is connected to the output node of the last filter stage, and the second end of the feedback capacitor is connected to the input node of the filter stage immediately preceding the last filter stage.

4. The analog filter of claim 1, wherein the input node of a first filter stage in the chain of filter stages is coupled to a current source.

5. The analog filter of claim 1 , wherein the output at the output node of the last filter stage is voltage.

6. The analog filter of claim 1 , wherein the last filter stage further comprises a first resistor and the filter stage immediately preceding the last filter stage further comprises a second resistor.

7. A method for filtration of a signal, comprising:

filtering the signal through a chain of filter stages, wherein each filter stage has an input node and an output node, and the output node of each filter stage in the chain of filter stages is connected to the input node of an immediately succeeding filter stage through a resistor;

feeding the signal at the output node of a last filter stage along the chain of filter stages to the input node of a first preceding filter stage through a first negative feedback loop; and

feeding the signal at the output node of one of the chain of filter stages to the input node of a second preceding filter stage through a positive feedback loop.

8. The method of claim 7, wherein the feeding of the signal at the output node of the last filter stage to the input node of the first preceding filter stage through a first negative feedback loop comprises feeding the signal at the output node of the last filter stage to the input node of the first preceding filter stage through a resistor.

9. The method of claim 7, further comprising feeding the signal at the output node of the filter stage immediately preceding the last filter stage to the input node of a third preceding filter stage through a second negative feedback loop.

10. The method of claim 9, wherein the feeding the signal at the output node of the filter stage immediately preceding the last filter stage to the input node of a third preceding filter stage through a second negative feedback loop comprises feeding the signal at the output node of

the filter stage immediately preceding the last filter stage to the input node of the third preceding filter stage through a resistor.

1 1. The method of claim 7, wherein the feeding of the signal at the output node of one of the chain of filter stages to the input node of a second preceding filter stage through a positive feedback loop comprises feeding the signal at the output node of the one of the chain of filter stages to the input node of the second preceding filter stage through a capacitor.

12. The method of claim 7, wherein the feeding of the signal at the output node of one of the chain of filter stages to the input node of a second preceding filter stage through a positive feedback loop comprises feeding the signal at the output node of the last filter stage along the chain of filter stages to the input node of the filter stage immediately preceding the last filter stage through a capacitor.