Doherty amplifier utilizing adaptive bias control

A Doherty amplifier, a technology of amplifiers, applied in the directions of amplifiers, improving amplifiers to improve efficiency, components of amplifying devices, etc., can solve the problems of high capacity of amplifiers and insufficient improvement of functional linearity

Inactive Publication Date: 2004-09-08
POSTECH ACAD IND FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, although the original Doherty amplifier achieved higher efficiency and higher output power than Class AB amplifiers while maintaining the same lev

Method used

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  • Doherty amplifier utilizing adaptive bias control
  • Doherty amplifier utilizing adaptive bias control
  • Doherty amplifier utilizing adaptive bias control

Examples

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Embodiment Construction

[0022] Detailed description of the preferred embodiment

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Fig. 2 shows a preferred embodiment of the present invention, wherein the UHF Doherty amplifier utilizing self-regulating bias control includes a coupler 10, an envelope detector 20, a first envelope shaping circuit 30, a second envelope shaping circuit 40. Input Doherty network 50, carrier amplifier 60, peak amplifier 70, output Doherty network 80 and delay line 90.

[0025] A portion of the input signal to the Doherty amplifier is extracted from the coupler 10 and supplied to the envelope detector 20 . The remaining input signal is provided to input Doherty network 50 via delay line 90 .

[0026] The envelope detector 20 detects the envelope voltage of the input signal. The envelope voltage is supplied to each of the first envelope shaping circuit 30 and the second envelope sha...

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PUM

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Abstract

An amplifier circuit using an adaptive bias control comprises an envelope detector for detecting an envelope of an input signal from a coupler, envelope shaping circuits for transforming of the envelope voltage from the envelope detector. The one transformed envelope voltage is applied to a drain bias for the peaking amplifier and the other is add by VDC to be applied to a gate bias for the carrier amplifier. In the Doherty amplifier, the gate voltage of the peaking amplifier and the drain voltage of the peaking amplifier are controlled in accordance with the input signal envelope to maximize efficiency with a desired linearity.

Description

technical field [0001] The present invention relates to amplifier circuits; in particular, the present invention relates to a Doherty amplifier utilizing adaptive bias control to maximize efficiency while improving its linearity to a desired level. Background technique [0002] It is well known in the art that a Doherty amplifier is a highly efficient amplifier capable of input and output impedance matching. Doherty amplifiers generally employ two amplifiers: a carrier amplifier and a peaking amplifier, and control the load line impedance of the carrier amplifier by changing the amount of current supplied by the peaking amplifier into a load according to the power value of the input signal. In order to obtain this high-efficiency performance over a wide input signal bandwidth, the Doherty amplifier employs the technique of connecting the carrier amplifier and the peaking amplifier in parallel with each other by a quarter-wave transmission line (λ / 4 line). [0003] Doherty a...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/07
CPCH03F1/0288H03F1/0266H03F1/07
Inventor 金汎晚车正贤慎范宰
Owner POSTECH ACAD IND FOUND
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