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1. WO1996042136 - VOLTAGE CONTROLLED OSCILLATOR WHICH IS INSENSITIVE TO POWER SUPPLY VOLTAGE NOISE

Publication Number WO/1996/042136
Publication Date 27.12.1996
International Application No. PCT/US1996/010366
International Filing Date 13.06.1996
Chapter 2 Demand Filed 19.12.1996
IPC
H03K 3/0231 2006.01
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 2006.01
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 3/0231
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
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
Applicants
  • ADVANCED MICRO DEVICES, INC. [US]/[US]
Inventors
  • LING, Kuok, Y.
Agents
  • BROOKS & MARTIN
Priority Data
08/487,25113.06.1995US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) VOLTAGE CONTROLLED OSCILLATOR WHICH IS INSENSITIVE TO POWER SUPPLY VOLTAGE NOISE
(FR) OSCILLATEUR COMMANDE EN TENSION INSENSIBLE AU BRUIT DE LA TENSION D'ALIMENTATION
Abstract
(EN)
A voltage controlled oscillator circuit with a high power supply rejection ratio is described. The oscillator circuit 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.
(FR)
Cette invention concerne un circuit d'oscillateur commandé en tension qui possède un taux élevé d'atténuation de la source d'alimentation. Ce circuit d'oscillateur comporte un transistor de fixation de niveau à chaque borne de sortie, lequel limite l'excursion du signal de ladite borne de sortie. Cette excursion de tension limitée permet d'effectuer des mouvements relativement importants dans les tensions de la source d'alimentation et à la masse, sans engendrer pour autant des modifications importantes dans la fréquence des signaux de sortie. Un circuit d'oscillateur de ce type peut être incorporé dans un circuit intégré qui possède des conducteurs d'alimentation et de masse bruyants. Il est également possible de créer plusieurs versions temporisées de la fréquence de sortie à l'aide d'un circuit de décalage de niveau et d'un circuit tampon. Ce circuit d'oscillateur réagit relativement rapidement aux modifications de la tension de commande, ajustant la fréquence d'oscillation dans un intervalle de temps relativement court.
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