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
CN1527478AInactive Publication Date: 2004-09-08POSTECH ACAD IND FOUND
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
POSTECH ACAD IND FOUND
Publication Date
2004-09-08
Estimated Expiration
Not applicable · inactive patent

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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.
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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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