Integrated phase locked loop local oscillator

Details Integrated phase locked loop local oscillator Integrated phase locked loop local oscillator

1993-03-12

1994-05-10

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 18, 331108C, 331117R, 331175, 455260, 455314, H03B 512, H03L 708, H04B 128

Patent

active

053111494

ABSTRACT:
An embodiment of the present invention is a single-chip GPS receiver front-end comprising a radio frequency amplifier, a voltage-controlled oscillator operating at a first local oscillator frequency, a divide by seven and one-half counter for deriving a second local oscillator frequency from the first and a first and second mixer. The local oscillator frequency is mid-way between two carrier frequencies of interest that may be received by the radio frequency amplifier and the first mixer produces a first intermediate frequency. The second local oscillator frequency is then beat with the first intermediate frequency in the second mixer to produce a second intermediate frequency. A dual-conversion super heterodyne configuration is therefore employed in which the first and second local oscillator frequencies are derived from a single oscillator and the first local oscillator frequency is seven and one-half times the second local oscillator frequency.

REFERENCES:
patent: 4851787 (1989-07-01), Martin
patent: 4856032 (1989-08-01), Klekotka et al.
patent: 5034706 (1991-07-01), Betti et al.
patent: 5187450 (1993-02-01), Wagner et al.
patent: 5210484 (1993-05-01), Remillard et al.

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