Patent ID: 7724039

Claim:
A conversion circuit for converting a differential signal into a single-phase signal, comprising: an in-phase output amplifier which amplifies a first differential signal of a pair of differential signals with opposite phases, and outputs a first output signal in-phase; an inverted-output amplifier, capacitively coupled with the in-phase output amplifier, which amplifies the second differential signal of the differential signals and inverts the phase of the second differential signal to output a second output signal; a circuit which adds the first output signal to the second output signal to output a single-phase signal; and a phase adjuster, connected to the drain side or the source side of the source-grounded amplifier, or the output side of the source-follower amplifier, which adjusts the phase difference of the first output signal or the second output signal, or a gain adjuster, connected to the drain side or the source side of the source-grounded amplifier, which adjusts the gain of the first output signal or the second output signal.