DC offset cancel circuit

Details DC offset cancel circuit DC offset cancel circuit

2008-01-08

2008-01-08

Le, Thanh Cong (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S296000, C375S346000

Reexamination Certificate

active

07317904

ABSTRACT:
A DC offset cancel circuit includes an analog adder1to whose one input a baseband analog signal output from a high-frequency reception section is input and to whose other input an analog correction signal output from a D/A converter7is input, and which corrects the reference voltage value of the baseband analog signal analogically to cancel a DC offset, an adder3which has the output of the A/D converter2as its one input and subtracts the lower bits of a sample value stored in a memory6to be described later as a DC offset value from the input value and outputs the resultant value, a control circuit5which outputs an output digital value of the A/D converter2as a sample value to the memory6,and a D/A converter7which converts a digital value of the upper bits of a sample value stored in the memory6to an analog correction signal and outputs the analog correction signal to the analog adder1.

REFERENCES:
patent: 6459889 (2002-10-01), Ruelke
patent: 2003/0086622 (2003-05-01), Klein Gunnewiek et al.
patent: 9-274539 (1997-10-01), None
patent: 9-331257 (1997-12-01), None

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