LEVEL DISCRIMINATING CIRCUIT

摘要

PURPOSE:To compensate the negative temperature coefficient of the transistor (TR) of the final stage by making the current density of plural TRs of the pre-stage different so as to provide a positive temperature coefficient among base-emitter voltages. CONSTITUTION:The current density of a current flowing to TRs Q1, Q2 is made different so as to give the positive temperature coefficient between base-emitter voltages of the two TRs. Thus, the negative temperature coefficient of a TR Q3 is compensated so as to keep the threshold voltage of the TR Q3 viewed from the terminal No.1 constant independently of the ambient temperature of an IC.