Phase locked loop frequency synthesizer using multiple dual modu

Details Phase locked loop frequency synthesizer using multiple dual modu Phase locked loop frequency synthesizer using multiple dual modu

1980-02-13

1982-02-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328 14, 328 42, 328 46, 328 48, 331 16, 331 25, H03K 2136, H03L 718

Patent

active

043161510

ABSTRACT:
An improved frequency synthesizer suitable for use in mobile and portable radio applications using multiple dual modulus prescalers to achieve high frequency operation and low current drain. A first high speed prescaler of limited size is used in conjunction with a second prescaler to avoid the use of one large high speed prescaler to attain high frequency operation. Consequently, the frequency synthesizer can be constructed using only a minimum amount of high speed, high current drain logic thereby reducing costs and power consumption.

REFERENCES:
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 3811092 (1974-05-01), Charbonnier
patent: 3849635 (1974-11-01), Freedman
patent: 3959737 (1976-05-01), Tanis
patent: 3976946 (1976-08-01), Schroder
patent: 4033633 (1977-07-01), Miller et al.
patent: 4053739 (1977-10-01), Miller et al.
patent: 4121162 (1978-10-01), Alberkrack et al.
patent: 4184068 (1980-01-01), Washburn

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