Frequency synthesizer with VCO output control

Details Frequency synthesizer with VCO output control Frequency synthesizer with VCO output control

1993-09-07

1994-08-02

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455260, 455265, 455343, 331 14, 331 17, 331 25, H04B 116

Patent

active

053353650

ABSTRACT:
A frequency synthesizer circuit, having first and second modes of operation, comprises a voltage-controlled oscillator (VCO) (64), a low-pass filter (74), a phase-locked loop (PLL) (67), an analog-to-digital converter (50), a digital-to-analog converter (56), a controller (48), and a VCO input switch. During the first mode, the VCO input switch couples the control input of the VCO to a control signal produced by the PLL, and the analog-to-digital converter measures the control signal and provides it to the controller which stores the control voltage measured by the analog-to-digital converter. During the second mode, the VCO input switch couples the control input of the VCO to the digital-to-analog converter which applies the stored control to the control input of the VCO.

REFERENCES:
patent: 4521918 (1985-06-01), Challen
patent: 4625180 (1986-11-01), Itaya et al.
patent: 4631496 (1986-12-01), Borras et al.
patent: 4667169 (1987-05-01), Matsuura et al.
patent: 4673892 (1987-06-01), Miyashita et al.
patent: 4743864 (1988-05-01), Nakagawa et al.
patent: 4893094 (1990-01-01), Herold et al.
patent: 4955075 (1990-09-01), Anderson
patent: 5103192 (1992-04-01), Sekine et al.

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