Negative feedback, phase rotation, phase acquisition and trackin

Details Negative feedback, phase rotation, phase acquisition and trackin Negative feedback, phase rotation, phase acquisition and trackin

1987-10-08

1989-03-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 25, H03L 710

Patent

active

048167754

ABSTRACT:
A phase acquisition and tracking apparatus in which a phase difference between a reference signal and a signal to be acquired is rotated within a negative feedback loop so that such phase difference disappears is disclosed. In another embodiment, a baseband signal which is influenced by such a phase difference is rotated within a negative feedback loop so that the phase difference disappears. The phase rotated signal serves as an output signal from the phase acquisition and tracking apparatus, and this output signal faithfully and rapidly reproduces the input signal regardless of any particular value of such phase difference. Since a negative feedback loop is used to control the amount of phase rotation, non-linearities and other errors produced by multipliers, summing devices and combining circuits are automatically compensated for through the feedback.

REFERENCES:
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4359692 (1982-11-01), Ryan
patent: 4652834 (1987-03-01), McAdam

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