Switching quadrature detector

Details Switching quadrature detector Switching quadrature detector

1980-05-06

1982-03-23

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329122, 329167, H03D 300

Patent

active

043215491

ABSTRACT:
A quadrature detector wherein the I and Q quadraturely related signals are roduced and processed in the same channel rather than parallel channels. A local oscillator feeds a 90.degree. phase splitter which produces a pair of quadrature signals. These are alternately fed to a balanced modulator for mixing with an input R.F. signal. The sum and difference frequency signals are fed through a low-pass filter which passes only the I and Q difference-frequency signals. These are then separated to provide two output signals corresponding to quadrature components of the input R.F. signal.

REFERENCES:
patent: 4119926 (1978-10-01), Frosch et al.
patent: 4241312 (1980-12-01), Barnes et al.
patent: 4259744 (1981-03-01), Junod et al.

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