High accuracy 90.degree. phase shift circuit error detection

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input

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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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