AMPLIFIER CIRCUIT

PURPOSE:To obtain stable characteristics at the time of applying a signal of a single frequency level to one TR to execute differential amplification by applying a signal obtained by inverting the phase of an input signal to the other transistor(TR) of the differential pair. CONSTITUTION:The amplifier circuit for applying a signal of a single frequency to one TR of the differential pair constituted of two TRs 30, 40 and differentially amplifying and outputting the signal is constituted so as to apply a signal obtained by inverting the phase of the input signal to the other TR. Thereby, the fluctuation of the potential of an inductance terminal due to a bonding wire connecting the collectors of these TRs 30, 40 can be canceled. Consequently, stable signals can be outputted from the collectors of the TRs 30, 40.