Circuit for settling DC offset in direct conversion receiver

Details Circuit for settling DC offset in direct conversion receiver Circuit for settling DC offset in direct conversion receiver

2011-04-26

2011-04-26

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S324000, C327S552000, C327S559000

Reexamination Certificate

active

07933575

ABSTRACT:
The present invention discloses a circuit for settling DC offset and controlling RC time-constant in a direct conversion receiver. The circuit includes a variable resistive unit for providing a continuously or non-continuously variable resistance in the direct conversion receiver. The variable resistive unit can provide the variable resistance by utilizing a controllable transistor or a plurality of resistors. Accordingly, the variable resistive unit can be coupled to a capacitor for constituting a high pass filter, which is capable of rapidly settling DC offset in a direct conversion receiver.

REFERENCES:
patent: 6784727 (2004-08-01), Cao et al.
patent: 2003/0224752 (2003-12-01), Rawlins et al.

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