High accuracy 90.degree. phase shift circuit error detection

Details High accuracy 90.degree. phase shift circuit error detection High accuracy 90.degree. phase shift circuit error detection

1998-06-25

2000-04-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327240, 327249, 327253, 375261, H03K 513

Patent

active

060548835

ABSTRACT:
A phase shift circuit includes a CR phase shifter for receiving an input signal to output a pair of first signals having a 90.degree. phase difference therebetween, a pair of variable-gain amplifiers for receiving the first signals to output a pair of second signals, an adder for adding both the second signals to output a sum signal, a subtracter for outputting a difference signal between the second signals, and a phase error detector for detecting the phase difference between the outputs from the adder and the subtracter to output a pair of gain control signal based on the phase difference. The gain control signal is fed-back to the variable-gain amplifier to control the ratio between the gains of the variable-gain amplifiers.

REFERENCES:
patent: 4109102 (1978-08-01), Yoshida et al.
patent: 5886584 (1999-03-01), Tanai et al.

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