DC OFFSET CORRECTION FOR DIRECT CONVERSION TUNER IC
摘要
The present invention discloses a method and apparatus for correcting the DC offset caused by self-conversion of the oscillator signal in an RF-to-baseband converter. The circuit comprises: a subtractor for subtracting an amplified DC offset signal from a filtered mixer signal to generate a corrected signal; a baseband amplifier coupled to the subtractor to receive the corrected signal to generate a baseband output signal; a low-pass filter coupled to the baseband amplifier to generate a DC offset signal representative of the DC offset; and a DC offset amplifier coupled to the low-pass filter and the subtractor to generate the amplified DC offset signal.
申请公布号
WO9946852(A1)
申请公布日期
1999.09.16
申请号
WO1999US03843
申请日期
1999.02.22
申请人
MAXIM INTEGRATED PRODUCTS, INC.
发明人
WILLIAMS, SCOTT, L.;MARSH, JAMES, W., H.;TOMASZ, MARTIN