Patent ID: 9614496
Date: 2017-04-04
CPC Classifications: H03H

Claim:
1. A wideband filter circuit with local feedback, comprising: a resistor-capacitor network having an input to receive an input signal; an emitter follower transistor, coupled to the resistor-capacitor network, wherein a collector of the emitter follower transistor has a collector current, an emitter of the emitter follower transistor has an emitter current, and the filter circuit has an output to provide an output signal from the emitter of the emitter follower transistor; a current source to provide a constant reference current; and a current-buffering servo loop circuit, coupled to the emitter follower transistor and the current source, including a current buffer and a controlled current sink to maintain the collector current equal to the constant reference current and the emitter current equal to the constant reference current.