Slow acting phase-locked loop with external control signal

Details Slow acting phase-locked loop with external control signal Slow acting phase-locked loop with external control signal

1979-10-26

1983-05-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 27, 332 19, H03L 708

Patent

active

043822347

ABSTRACT:
A modulator for controlling the frequency of the power applied to a gyroscope to rotate the seismic mass (wheel) of the gyro so as to compensate for movement of the gyro case about the spin axis of the gyro is disclosed. The modulator includes a slow acting phase-locked loop that includes: a high frequency (e.g., 20 MHz) crystal controlled voltage controlled oscillator (VCXO); a divider for dividing the VCXO frequency down by several orders of magnitude (e.g., six); a phase comparator for comparing the relatively low frequency output of the divider with a low frequency reference signal; a loop filter for filtering the output of the phase comparator so as to give the loop its desired dynamic response chacteristic and bandwidth; and, a summing amplifier for summing the output of the phase comparator with a rate signal having a voltage level linearly related to the rate of movement of the gyro case about its spin axis. The rate signal is obtained from a second gyro mounted so as to sense movement about the spin axis of the gyro whose power frequency is being modulated. The power frequency control signal is derived from the output of the VCXO via a divider, which may form part of the divider of the slow acting phase-locked loop.

REFERENCES:
patent: 3414842 (1968-12-01), Broadhead, Jr.
patent: 3579281 (1971-05-01), Kam et al.
patent: 3673430 (1972-06-01), Donoghue
patent: 4009455 (1977-02-01), Ishigaki et al.
patent: 4052672 (1977-10-01), Enderby et al.
patent: 4068181 (1978-01-01), Clark et al.

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