Image rejection mixer for broadband signal reception

Details Image rejection mixer for broadband signal reception Image rejection mixer for broadband signal reception

2006-01-10

2006-01-10

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S266000, C455S307000, C455S323000

Reexamination Certificate

active

06985710

ABSTRACT:
An image rejection mixer includes an input terminal for receiving an input radio frequency (RF) signal, a mode selector coupled to the input terminal generating an output signal for either high side mixing or low side mixing, a first mixer coupled to receive the input RF signal and a signal from a local oscillator providing a signal having a local oscillator frequency, a phase converter coupled to convert the phase of the signal from the local oscillator, a second mixer coupled to receive the output signal from the mode selector and the phase-converted local oscillator signal, and a tunable polyphase filter coupled to receive output signals from the first mixer and the second mixer, the tunable polyphase filter providing an output signal having a variable intermediate frequency. In one embodiment, the variable intermediate frequency the tunable polyphase filter is implemented as a switchable intermediate frequency.

REFERENCES:
patent: 5060297 (1991-10-01), Ma et al.
patent: 6127962 (2000-10-01), Martinson
patent: 6226509 (2001-05-01), Mole et al.
patent: 6766178 (2004-07-01), Damgaard et al.

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