ADAPTIVE LINEAR AMPLIFIER

Abstract

The present invention relates to an amplifier and, more particularly, to an adaptive linear amplifier with low power consumption and a high linearity. The adaptive linear amplifier according to the present invention comprises amplification means and a bias controller. The amplification means comprises a main transistor and an auxiliary transistor unit. The main transistor and the auxiliary transistor unit are coupled to each other. The bias controller controls a bias voltage applied to the main transistor and the auxiliary transistor unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a circuit diagram of a conventional amplifier;

FIG. 2 is a circuit diagram of an adaptive linear amplifier according to an embodiment of the present invention; and

FIG. 3 is a graph showing output power regions of the adaptive linear amplifier according to an embodiment of the present invention.

Claims

1. An adaptive linear amplifier, comprising: amplification means comprising a main transistor and an auxiliary transistor unit, the main transistor and the auxiliary transistor unit being coupled to each other; anda bias controller for controlling a bias voltage applied to the main transistor and the auxiliary transistor unit.

2. The adaptive linear amplifier of claim 1, wherein the main transistor and the auxiliary transistor unit are coupled in parallel.

3. The adaptive linear amplifier of claim 1, wherein: the auxiliary transistor unit comprises a first auxiliary transistor and a second auxiliary transistor, andthe first auxiliary transistor and the second auxiliary transistor are coupled in parallel.

4. The adaptive linear amplifier of claim 1, wherein the bias controller generates the bias voltage with reference to a Look Up Table (LUT).

5. The adaptive linear amplifier of claim 4, wherein the LUT comprises bias data for a low output power and bias data for a high output power.

6. The adaptive linear amplifier of claim 1, wherein: the main transistor operates in a saturation region, andthe auxiliary transistor unit operates in a sub-threshold region.