Zero intermediate-frequency demodulator

Details Zero intermediate-frequency demodulator Zero intermediate-frequency demodulator

1986-06-26

1988-07-05

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 78, H03D 300

Patent

active

047557613

ABSTRACT:
A zero intermediate-frequency (IF) demodulator includes a pair of mixers receiving a quadrature local oscillator signal, for converting the FM-modulated input signal to an in-phase I baseband signal and a quadrature-phase Q baseband signal; each I and Q signal is then delayed and the I and Q signals and the delayed I.sub.d and Q.sub.d signals are arithmetically processed to generate first and second modulation-related signals, which are summed to provide the recovered modulation as an output signal. The arithmetic processing may use additive and/or multiplicative operations.

REFERENCES:
patent: 4612509 (1986-09-01), Betts et al.
patent: 4647864 (1987-03-01), Rafferty et al.
"Noise Consideration in an Integrated Circuit VHF Radio Receiver", J. K. Goatcher et al., p. 49 et seq., Conference on Radio Receivers and Associated Systems, University of Leeds, Jul. 1981.
"Differential Detection of MSK with Non-Redundant Error Correction", T. Masamura et al., pp. 912-918, IEEE Transactions on Communications, vol. Com. 27, No. 6 (Jun. 1979).

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