Discrete-time amplitude control of voltage-controlled...

Details Discrete-time amplitude control of voltage-controlled... Discrete-time amplitude control of voltage-controlled...

2005-06-21

2005-06-21

Mis, David (Department: 2817)

Oscillators

Amplitude control or stabilization

Automatic

C331S109000, C331S1170FE, C331S186000

Reexamination Certificate

active

06909336

ABSTRACT:
Periodically, sensed amplitude for the output signal of a voltage-controlled oscillator is compared to a reference and biasing of the voltage-controlled oscillator is correspondingly set, thereby controlling amplitude of the voltage-controlled oscillator output signal. Process and temperature dependencies of the amplitude are eliminated while achieving low phase noise and large signal-to-noise ratio in the output signal, and consequently low phase noise.

REFERENCES:
patent: 3621465 (1971-11-01), Beaty
patent: 4058809 (1977-11-01), Chudleigh, Jr.
patent: 5001649 (1991-03-01), Lo et al.
patent: 6667663 (2003-12-01), Ozawa
Margarit, Mihai A., et al, “A Low-Noise, Low-Power VCO With Automatic Amplitude Control for Wireless Applications,” IEEE Journal of Solid-State Circuits, vol. 34, No. 6, Jun. 1999, pp. 761-771.
Rogers, John W.M., et al., “A Study of Digital and Analog Automatic-Amplitude Control Circuitry for Voltage-Controlled Oscillators,” IEEE Journal of Solid-State Circuits, vol. 38, No. 2, Feb. 2003, pp. 352-356.

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