Oscillators – Amplitude control or stabilization – Automatic
Reexamination Certificate
2005-01-04
2005-01-04
Mis, David (Department: 2817)
Oscillators
Amplitude control or stabilization
Automatic
C331S109000, C331S1170FE
Reexamination Certificate
active
06838952
ABSTRACT:
An amplitude control device for a signal output by an oscillator includes a rectification circuit for rectifying the output signal, and a differential amplification circuit for generating a biasing current control signal for the oscillator. The biasing current control signal is based upon the output signal from the rectification circuit and a reference voltage. A dividing bridge and an adder are designed so that only a fraction of the reference voltage is used to define the amplitude of the oscillations. The contribution made to the oscillator phase noise by the reference voltage noise is considerably reduced.
REFERENCES:
patent: 4999588 (1991-03-01), Koch
patent: 2909814 (1980-09-01), None
Margarit et al., A Low-Noise, Low-Power VCO with Automatic Amplitude Control for Wireless Applications, IEEE Journal of Solid-State Circuits, IEEE Inc., New York, US, vol. 34, No. 6, Jun. 1999, pp. 761-771, XP000913030.
Zanchi et al., Automatic Amplitude Control Loop for a 2-V, 2.5 GHz LC-Tank VCO, Proceedings of the IEEE 2001 Custom Integrated Circuits Conference, San Diego, CA, May 6-9, 2001, IEEE Custom Integrated Circuits Conference, New York, NY, vol. CONF. 23, May 6, 2001, pp. 209-212, XP010546881.
Zanchi et al., A 2-V 2.5 GHz—104—dBc/Hz at 100 kHz Fully Integrated VCO with Wide-Band Low-Noise Automatic Amplitude Control Loop, IEEE Journal of Solid-State Circuits, vol. 36, No. 4, Apr. 4, 2001, pp. 611-619, XP002231063.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Jorgenson Lisa K.
STMicroelectronics SA
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