Bias circuit with mode control and compensation for voltage and temperature

摘要

An amplifier bias system. The amplifier bias system includes a battery voltage supply coupled with an amplifier transistor to be biased; an output node coupled with a gate of the amplifier transistor; and a current source coupled with the battery voltage supply, wherein the current source provides a current to a node in response to the battery voltage supply. The amplifier bias system further includes a first transistor coupled between the battery voltage supply and the output node, the first transistor having a gate coupled with the first node; a second transistor coupled with the first node, the second transistor having a gate coupled with the output node; and a current load coupled with the output node.