Adaptive bias circuit

摘要

An amplifier arrangement for amplifying an alternating signal, comprising an amplifier and an adaptive biasing circuit, the amplifier configured to receive an alternating signal for amplification and a bias signal for biasing the amplifier from the adaptive biasing circuit, the adaptive biasing circuit comprising a PTAT circuit wherein the PTAT circuit is configured to receive the alternating signal and modulate the bias signal based on the alternating signal.

主权项

1. An amplifier arrangement comprising:
an amplifier; and an adaptive bias circuit configured to provide an adaptive bias signal to the amplifier, the adaptive bias circuit comprising a Proportional to Absolute Temperature (PTAT) circuit configured to modulate the adaptive bias signal based on an alternating signal for amplification by said amplifier, wherein the PTAT circuit further comprises:
a first transistor and a second transistor, each comprising a base terminal, a collector terminal and an emitter terminal;a first isolating resistor located between a base connection node and the base terminal of the first transistor;a second isolating resistor located between the base connection node and the base terminal of the second transistor;a first capacitor, wherein the base connection node is coupled to a first plate of the first capacitor and a second plate of the first capacitor is coupled to ground; and a sampling capacitor having a first plate and a second plate, the first plate coupled to an output of the amplifier for receiving the alternating signal and the second plate coupled to the base terminal of the second transistor.