Frequency modulator having a modulation varactor coupled to outp

Details Frequency modulator having a modulation varactor coupled to outp Frequency modulator having a modulation varactor coupled to outp

1995-05-01

1996-10-08

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4551972, 455264, 455333, 331 74, 331177V, 332141, H04B 126

Patent

active

055641008

ABSTRACT:
A frequency modulator (100) is provided which includes a VCO (200) having a modulation varactor (122) coupled to its output (128). The VCO (200) includes a resonator stage (112) coupled to an amplifier stage comprising a transistor (118). Coupling of the varactor (122) and the resonator stage (112) is provided via the phase collector capacitance (C.mu.) of the transistor (118).

REFERENCES:
patent: 4458215 (1984-07-01), Huang et al.
patent: 4494090 (1985-01-01), Popeck et al.
patent: 4721927 (1988-01-01), Aota et al.
patent: 5160902 (1992-11-01), Saeki et al.
patent: 5258997 (1993-11-01), Fraser

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