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1. US5585764 - High-speed voltage controlled oscillator which is insensitive to changes in power supply voltage

Office United States of America
Application Number 08487251
Application Date 13.06.1995
Publication Number 5585764
Publication Date 17.12.1996
Grant Number 5585764
Grant Date 17.12.1996
Publication Kind A
IPC
H03L 1/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
1Stabilisation of generator output against variations of physical values, e.g. power supply
H03B 5/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
5Generation of oscillations using amplifier with regenerative feedback from output to input
02Details
04Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
H03K 3/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
H03K 3/0231
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
02Generators characterised by the type of circuit or by the means used for producing pulses
023by the use of differential amplifiers or comparators, with internal or external positive feedback
0231Astable circuits
H03K 3/03
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
02Generators characterised by the type of circuit or by the means used for producing pulses
027by the use of logic circuits, with internal or external positive feedback
03Astable circuits
CPC
H03K 3/0322
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
02Generators characterised by the type of circuit or by the means used for producing pulses
027by the use of logic circuits, with internal or external positive feedback
03Astable circuits
0315Ring oscillators
0322with differential cells
H03K 3/0231
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
02Generators characterised by the type of circuit or by the means used for producing pulses
023by the use of differential amplifiers or comparators, with internal or external positive feedback
0231Astable circuits
H03K 3/03
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
3Circuits for generating electric pulses; Monostable, bistable or multistable circuits
02Generators characterised by the type of circuit or by the means used for producing pulses
027by the use of logic circuits, with internal or external positive feedback
03Astable circuits
Applicants Advanced Micro Devices, Inc.
Inventors Ling Kuok Y.
Agents Daffer; Kevin L. Conley, Rose & Tayon
Title
(EN) High-speed voltage controlled oscillator which is insensitive to changes in power supply voltage
Abstract
(EN)

A voltage controlled oscillator circuit with a high power supply rejection ratio incorporates a clamping transistor with respect to each output terminal which limits the signal swing of the output terminal. The limited voltage swing allows relatively large movements in the power supply and ground voltages without causing significant changes in the frequency of the output signals. Such an oscillator circuit may be incorporated into an integrated circuit characterized by noisy power supply and ground conductors. Additionally, multiple delayed versions of the output frequency may be created using a level shifter circuit and a buffer circuit. The oscillator circuit is relatively quick to react to changes in the controlling voltage, adjusting the oscillation frequency in a relatively short time interval.

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