Matshushita Electric Industrial Co., Ltd.

Tomio Aida

Yasutaka Uramoto

Masatoshi Matsushita

A DC offset cancel circuit includes an analog adderto 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 converteris input, and which corrects the reference voltage value of the baseband analog signal analogically to cancel a DC offset, an adderwhich has the output of the A/D converteras its one input and subtracts the lower bits of a sample value stored in a memoryto be described later as a DC offset value from the input value and outputs the resultant value, a control circuitwhich outputs an output digital value of the A/D converteras a sample value to the memoryand a D/A converterwhich converts a digital value of the upper bits of a sample value stored in the memoryto an analog correction signal and outputs the analog correction signal to the analog adder

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Tokyo, Japan

Tomio Aida