Direct conversion receiver

Details Direct conversion receiver Direct conversion receiver

2006-11-07

2006-11-07

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S317000, C455S324000

Reexamination Certificate

active

07133656

ABSTRACT:
A direct conversion receiver is disclosed wherein a received RF signal is mixed in a mixer with a local oscillation signal having a frequency the same as a desired central frequency, and is down-converted to a base band signal. The receiver comprises a divider for dividing the received RF signal; an adder provided at a received RF signal input side of the mixer; a phase shifter provided before the input of the mixer, for shifting a phase of the divided signal of the received RF signal; and a gain adjustable amplifier provided after the divider, and before or after the phase shifter, for amplifying the divided signal to supply the phase-shifted and amplified signal to the adder. Accordingly a DC offset due to the direct conversion can be removed and an adverse effect due to transient response when the DC offset changes can be prevented.

REFERENCES:
patent: 4944025 (1990-07-01), Gehring et al.
patent: 5119399 (1992-06-01), Santos et al.
patent: 5918167 (1999-06-01), Tiller et al.
patent: 2001-119316 (2001-04-01), None
patent: 2002-076976 (2002-03-01), None
Supplementary European Search Report dated May 25, 2005.
International Search Report dated Jul. 9, 2002.

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