Image rejection curcuit
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United States of America Patent
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N/A
Issued Date -
Aug 2, 2007
app pub date -
May 25, 2005
filing date -
Jun 3, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In order to provide an image rejection circuit that can reject an image signal without being affected by manufacturing variations in circuit elements such as resistors, condensers, or the like, an image rejection circuit is provided which comprises a first mixer unit 2 for mixing a signal received by a receiver device with a first local oscillation signal generated by a local oscillator 1, a second mixer unit 3 for mixing the received signal with a second local oscillation signal obtained by shifting the local oscillation signal generated by the local oscillator 1 by 90.degree., a polyphase filter circuit 4 including condensers C1 and switched capacitors, and a composition/output unit 5 for composing and outputting the IF signals output from the polyphase filter circuit 4.
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