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Amplifier circuit having an extended Wilson current-mirror self-bias boosting circuit

An amplifier circuit, current mirror technology, applied in amplifiers, high-frequency amplifiers, improving amplifiers to reduce temperature/power supply voltage changes, etc. The effect of current reduction

Active Publication Date: 2009-07-29
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme is able to achieve high power-adding efficiency while maintaining linearity, it uses rather complex circuitry and introduces a rather high noise level to the output stage

Method used

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  • Amplifier circuit having an extended Wilson current-mirror self-bias boosting circuit

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Embodiment Construction

[0016] A schematic diagram of the amplifier circuit 1 is represented in this single figure of the drawings. This amplifier circuit consists of amplifying transistors and coupled to the amplifying transistor through resistor R1 Base DC bias circuit 2. This bias circuit 2 includes bipolar transistors Q2 and Q3 coupled in series between Vcc and a common terminal (Gnd), the common point of these two transistors is coupled to the transistor base. The basic circuit structure is completed by the input coupling capacitor C0, which is used to couple an input (Input) to the amplifier transistor the base of the transistor, where the Connected as common emitter structure and coupled between Vcc and Gnd through inductor L1. The output of the power amplifier circuit 1 (Output) is taken from the transistor through the capacitor C1 collector.

[0017] With respect to the circuits shown, it is understood that although the active components are shown as bipolar transistors for illu...

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PUM

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Abstract

An amplifier circuit ( 1 ) includes an amplifying transistor (QØ) and a dc bias circuit ( 2 ) for biasing the amplifier transistor (QØ) to obtain a conduction angle of at least about 180°. The dc bias circuit ( 2 ) includes a self-bias boosting circuit which has a Wilson current-mirror (Q 4 , Q 5 , Q 6 ) integrated with a cascode current-mirror circuit (Q 2 , Q 3 ) to form an extended Wilson current-mirror circuit (Q 2 -Q 6 ) having an output coupled to a control terminal of the amplifying transistor (QØ) by a resistor (R 1 ), and a capacitor (C 2 ) coupled from the extended Wilson current-mirror circuit (Q 2 -Q 6 ) to a common terminal (Gnd).

Description

technical field [0001] The invention belongs to the field of transistor amplifier circuits, and particularly relates to a power amplifier circuit with an extended Wilson current mirror self-bias boosting circuit. Background technique [0002] Amplifiers of this general type are frequently used in high frequency RF amplifiers, such as in telecommunications applications, but also in audio amplifiers and other applications. To obtain a linear input-output relationship and high operating efficiency, such amplifiers are typically operated with a conduction angle of about 180° (Class B) or slightly larger (Class AB) to avoid crossover distortion. [0003] Typically, this type of amplifier requires a DC bias circuit to establish a quiescent bias current in the amplifier circuit to ensure operation in Class B or Class AB mode. In the prior art, the bias is typically provided by a fixed current source (as shown in US Patent No. 5,844,443), or alternatively by an external power suppl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30H03F3/189
CPCH03F1/302H03F3/189H03F2200/108H03F2200/18
Inventor S·罗
Owner NXP BV
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