Frequency synthesizer for frequency agile modem

Details Frequency synthesizer for frequency agile modem Frequency synthesizer for frequency agile modem

1989-08-15

1991-08-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331117R, 331177V, 375 8, 455 75, H03L 799, H03B 512

Patent

active

050399560

ABSTRACT:
A diode tuned resonant circuit (42) with an inductor (L1) a first variable reactance diode (VAR1) connected in parallel with the inductor (L1), and a second variable reactance diode (VAR2) connected in series with the parallel combination of the inductor (L1) and first diode (VAR1) is used in an oscillator circuit. The resonant frequency of the circuit may be adjusted over a relatively broad frequency range while maintaining a relatively constant Q-factor by applying a biasing voltage to the first and second diodes (VAR1, VAR2).

REFERENCES:
patent: 3370254 (1968-02-01), Keller
patent: 3400338 (1968-09-01), Ishman
patent: 3959728 (1976-05-01), Yamazaki et al.
patent: 4229822 (1980-10-01), Bench
patent: 4317227 (1982-02-01), Skerlos
patent: 4484153 (1984-11-01), Borras et al.
patent: 4703286 (1987-10-01), Muterspaugh
patent: 4734657 (1988-03-01), Somer
Rohde, U. L. "Diode Tuned Resonant Circuits", in: Digital PLL Frequency Synthesizers (Englewood Cliffs, N.J.; Prentice-Hall Inc.) pp. 170-173.

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