Predistortion circuit for Doherty linear microwave amplifier

A technology of pre-distortion circuit and amplifier circuit, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, amplifier combinations, etc., and can solve problems such as increasing internal modulation distortion

Inactive Publication Date: 2003-01-15
TRW INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While gain extension and phase compression can be achieved by operating the amplifier in Class B and Class C, this operation adds internal modulation (IM) distortion

Method used

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  • Predistortion circuit for Doherty linear microwave amplifier
  • Predistortion circuit for Doherty linear microwave amplifier
  • Predistortion circuit for Doherty linear microwave amplifier

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Embodiment Construction

[0016] The present invention relates to a predistortion circuit for a Doherty amplifier, which precompensates the gain compression and phase expansion of the downlink Doherty power amplifier. The predistortion circuit can be configured as a Doherty amplifier, but operates at a bias point that provides gain expansion and phase compression to counteract the gain compression and phase expansion of the downstream Doherty PA while reducing internal modulation (IM) distortion .

[0017] The microwave power amplifier used in the present invention is represented by reference numeral 20 and is described in figure 1 shown in . The microwave power amplifier 20 includes a carrier amplifier 22 and a peak amplifier 24 . The carrier amplifier 22 and the peaking amplifier can be formed from heterojunction bipolar transistors (HBT) 22 and specifically as pre-matched 1.5*30μm 2 *4 Refers to InP DHBT devices with a total emitter area of ​​180μm 2 . An example of such a device is found in "...

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Abstract

The patent relates a predistortion circuit for application of the doherty amplifier as linearizing microwave amplifiers, and more particularly to predistortion circuit configured as a Doherty amplifier. The predistortion circuit is adapted to be coupled to a downstream Doherty amplifier to precompensate for the gain compression and phase expansion of the downstream Doherty amplifier as the input power level is increased while simultaneously reducing the intermodulation (IM) distortion. In order to provide precompensation, the precompensation circuit is operated at bias level to provide gain expansion and phase compression to cancel out the gain compression and phase expansion of the downstream Doherty amplifier to provide a higher overall linear power added efficiency (PAE).

Description

[0001] Cross References to Related Applications [0002] This application is related to Kevin Kobayashi's commonly-owned pending patent application No. XXX: "HEMT-HBT Doherty, Microwave Amplifier," filed concurrently with this application, Attorney Docket No. 12-1107, and Kevin W. Kobayashi, Application No. XXX, "Asymmetrically Biased Highly Linear Balanced Amplifier," filed concurrently with this application, Attorney Docket No. 12-1110. technical field [0003] The invention relates to a power amplifier, especially a microwave power amplifier topology, which can provide predistortion to precompensate the gain compression and phase expansion of the downlink power amplifier. Background technique [0004] RF and microwave communication systems place increasing demands on the linearity and efficiency of power amplifiers. Unfortunately, conventional power amplifiers operate at optimum efficiency when they are at or near saturation, so systems using conventional power amplifier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/60H03F1/02H03F1/32H03F3/68
CPCH03F1/3241H03F1/0288H03F1/32
Inventor 凯文·W·科巴亚西
Owner TRW INC
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