US 2010/0148871 A1 · SYSTEMS AND METHODS FOR AN ADAPTIVE BIAS CIRCUIT FOR A DIFFERENTIAL POWER AMPLIFIER

Abstract

Systems and methods for providing an adaptive bias circuit that may include a differential amplifier, low-pass filter, and common source amplifier or common emitter amplifier. The adaptive bias circuit may generate an adaptive bias output signal depending on input signal power level. As the input power level goes up, the adaptive bias circuit may increase the bias voltage or bias current of the adaptive bias output signal. A power amplifier (e.g., a differential amplifier) may be biased according to the adaptive bias output signal in order to reduce current consumption at low power operation levels.

Claims20

Dependent claims

An adaptive bias circuit for controlling an operations of an amplifier, comprising:

a differential amplifier that receives differential input signals and generates amplified differential input signals;
a current mirror that converts the amplified differential input signals into a single-ended signal;
a low-pass filter that filters out one or more high-frequency components of the single-ended signal to generate a filtered single-ended signal;
and
a common-source amplifier or common-emitter amplifier that receives the filtered single-ended signal and generates an adaptive bias signal for operating a power amplifier.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/620,462Filed 17 Nov 2009

Priority

11 Dec 2008

Published

17 Jun 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

H03F 3/45179
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using MOSFET transistors as the active…
H03F 2203/45394
Indexing scheme relating to differential amplifiers: the AAC of the dif amp comprising FETs whose sources are not coupled, i.e. the AAC being a…
H03F 2203/45541
Indexing scheme relating to differential amplifiers: the IC comprising dynamic biasing means, i.e. controlled by the input signal
H03F
Amplifiers

Systems and methods for an adaptive bias circuit for a differential power amplifier

Life of this patent

Systems and methods for an adaptive bias circuit for a differential power amplifier

Life of this patent

Abstract

Claims20