Pilot signal detection circuit and semiconductor integrated circuit equipping the circuit
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United States of America Patent
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N/A
Issued Date -
Jul 26, 2007
app pub date -
Feb 22, 2005
filing date -
Mar 9, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The purpose of the present invention is to improve a detection accuracy of a pilot signal detection circuit. A pilot detection signal voltage is input to a differential amplifier circuit 16 and a reference voltage generated by a reference signal generation circuit 17 is input to a differential amplifier circuit 19. A pilot signal is compared with the reference voltage by the differential amplifier circuits 16 and 19. Output currents of the differential amplifier circuits 16 and 19 are converted into voltages by a current-to-voltage conversion circuit 21. And an input to the current-to-voltage conversion circuit 21 is fed back with a voltage proportionate with an offset voltage of the circuit and the offset voltage of the pilot signal detection circuit is cancelled.
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