Electronic system, RF power amplifier and output power compensation method thereof

摘要

A radio frequency (RF) power amplifier is disclosed. The power amplifier includes an output stage circuit, an exponential type bias circuit and a voltage-current transformation circuit. The output stage circuit receives a first system voltage and outputs an output current. The exponential type bias circuit receives a bias current, wherein a relationship between the bias current and output current is exponential, and when the bias current is zero current, and the output current is zero current. The voltage-current transformation circuit transforms the first system voltage into a second current so that the bias current is in proportion to the first system voltage, and thus the relationship between the output current and the first system voltage is exponential. The bias current is equal to times of the sum of the first current and the second current.

主权项

1. A RF power amplifier, comprising:
an output stage circuit, receiving a first system voltage, and outputting an output current; an exponential type bias circuit, coupled to the output stage circuit, receiving a bias current through being coupled to a second system voltage, wherein the relationship between the bias current and output current is exponential, and when the bias current is a zero current, the output current is a zero current; and a voltage-current transformation circuit, coupled to the exponential type bias circuit to receive a first current, transforming a first system voltage received into a second current so that the bias current is in proportion to the first system voltage, and thus a relationship between the output current and the first system voltage is exponential, wherein the bias current is equal to times of a sum of the first current and the second current.