Direct conversion receiver and transceiver

Details Direct conversion receiver and transceiver Direct conversion receiver and transceiver

2006-02-28

2006-02-28

Matar, Ahmad F. (Department: 2642)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S323000, C375S322000, C375S329000

Reexamination Certificate

active

07006814

ABSTRACT:
A receiver of the direct conversion system by which problems arising from interference between a reception signal and a local signal used by a quadrature demodulator on the reception side are moderated. Where the carrier frequency of a transmission signal is represented by ftand the carrier frequency of a reception signal by frwhile the frequency interval between the transmission and reception carrier frequencies is represented by fs(=fr−ft), first and second local oscillators generate first and second local signals fLO1, fLO2having frequencies fLO1≈ft−fsand fLO2≈2·fs, respectively. A mixer mixes the first and second local signals to generate an internal local signal which is a sum frequency component. The internal local signal is supplied to a quadrature demodulator of the reception side. The mixer and a band-pass filter are formed in the same LSI chip as the quadrature demodulator.

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