Patent ID: 7843229
Filing Date: 2010-11-30
Classification: H03F

Abstract:
1. A signal output circuit comprising: a first transistor of an emitter follower configuration, the first transistor receiving an input signal; a second transistor of an emitter follower configuration, the second transistor receiving the input signal and having an emitter connected to an external load; a comparator circuit having an input pair for receiving emitter outputs of the first and the second transistors and comparing the received emitter outputs of the first and the second transistors; first and second current sources; a first current mirror circuit having an input connected to an output of the first current source, and having an output connected to the emitter of the first transistor; and a second current mirror circuit having an input connected to a connection node of an output of the second current source and an output of the comparator circuit, and having an output connected to the emitter of the second transistor.