Integrated oscillator and radio telephone using such an oscillat

Details Integrated oscillator and radio telephone using such an oscillat Integrated oscillator and radio telephone using such an oscillat

1997-10-07

1999-08-10

To, Doris H.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455264, 455318, 331177V, 331108C, 331108R, H04B 110

Patent

active

059373407

ABSTRACT:
The invention relates to an oscillator OSC intended to provide an output signal having a frequency which is variable as a function of a tuning voltage Vtun. The oscillator OSC includes a passive part having two series-arranged variable capacitances Cs, biased by the tuning voltage Vtun, and connected to a power supply VCC via two inductances Lext, and an active part having a first transistor T1 and a second transistor T2 whose collectors are connected to the output terminals C1 and C2 of the passive part, the base of one transistor being connected to the collector of the other transistor via a coupling capacitor Cfb. According to the invention, the passive part includes two high-pass filters, each being inserted between one of the output terminals S1 or S2 and one of the variable capacitances Cs, which allows a reduction of the active part's sensitivity to low-frequency noise.

REFERENCES:
patent: 5231361 (1993-07-01), Smith et al.
patent: 5486796 (1996-01-01), Ishikawa et al.
patent: 5629652 (1997-05-01), Weiss
"A Monolithic GaAs IC for Heterodyne Generation of RF Signals" by Mr. Rory L. Van Tuyl, published in IEEE Transactions on Electron Devices, vol. ED-28, No. 2.

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