Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1992-09-21
1993-12-14
Mis, David
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
329308, 375 80, 375 86, H03D 300, H04L 2722
Patent
active
052706656
ABSTRACT:
For processing a multiplied signal into a modified signal in a demodulator circuit, an adder (34) sums up a first, a second, and a third processed signal into a sum signal for use as the modified signal. A first processing circuit (31) processes the multiplied signal into the first processed signal. A second processing circuit (32) processes the multiplied signal into the second processed signal in accordance with a conjugate complex clock and a complex local signal. A third signal processing circuit (33) processes the multiplied signal into the third processed signal in accordance with a complex clock and a conjugate complex local signal. The complex clock signal represents a first complex number. The complex local signal represents a second complex number. The conjugate complex clock signal represents a complex conjugate of the first complex number. The conjugate complex local signal represents a complex conjugate of the second complex number.
REFERENCES:
patent: 5170415 (1992-12-01), Yoshida et al.
Mis David
NEC Corporation
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