Circuit for protecting bipolar transistor against thermal damage has resistance connected to base of bipolar transistor and capacitor connected in parallel with resistance

摘要

The circuit has a resistance (R1-RN) connected to the base of the bipolar transistor (T1-Tn) and a capacitor (C1-CN) connected in parallel with the resistance. The bipolar transistor has a negative base-emitter threshold temperature coefficient and the circuit acts as a frequency-selective load circuit. AN Independent claim is also included for the following: an amplifier circuit with a bipolar transistor and an inventive circuit.