US 10,079,574 B2 · Wideband adaptive bias circuits for power amplifiers

Abstract

Methods and apparatus for providing adaptive biasing to power amplifiers. Adaptive bias circuits are configured to provide sharp turn on and/or current clamping to improve the efficiency of a power amplifier over a wide input signal bandwidth. Sharp turn on may be achieved using a subtraction technique to subtract outputs from multiple detectors. Clamping may be achieved using MOSFET device characteristics to pull the device from the triode region into the saturation, subtraction techniques to subtract the outputs from multiple detectors, and/or by using circuit devices, such as diodes.

Claims12

Dependent claims

An adaptive bias circuit, comprising:

a first detector circuit configured to output a first current based on an input power, wherein the first detector circuit is configured to clamp the first current at a first input power level;
and
a second detector circuit configured to output a second current based on the input power, wherein the second detector circuit is configured to clamp the second current at a second input power level lower than the first input power level;
wherein the first detector circuit and the second detector circuit are arranged to provide an output current that subtracts the second current from the first current.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/019,409Filed 9 Feb 2016

Published

US 2017/0230006 A110 Aug 2017

Granted

18 Sep 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification29 codes

H03F 1/0222
Continuous control: by using a signal derived from the input signal
H03F 1/0261
In transistor amplifiers: with control of the polarisation voltage or current, e.g. gliding Class A
H03F 1/0266
With control of the polarisation voltage or current, e.g. gliding Class A: by using a signal derived from the input signal
H03F 1/0277
In transistor amplifiers: selecting one or more amplifiers from a plurality of amplifiers

Wideband adaptive bias circuits for power amplifiers

Life of this patent

Wideband adaptive bias circuits for power amplifiers

Life of this patent

Abstract

Claims12