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Offset control circuit

A bias control and voltage control technology, applied in artificial gain control, radio/induction link selection arrangement, electrical components, etc., can solve the problems of wasting power, small output impedance, etc., achieve simple structure, suppress useless power consumption, The effect of reducing waste current

Inactive Publication Date: 2002-10-09
MOBILE COMM TOKYO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, according to the bias control circuit composed of such a current Miller circuit and having a very small output impedance, a large current flows through the transistor 4 of the bias control circuit, and this current is waste that does not contribute to the base input current of the transistor 2. current, which becomes the main cause of wasted power

Method used

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Embodiment Construction

[0022] A bias control circuit according to an embodiment of the present invention will be described below.

[0023] The bias control circuit is for the high-frequency power amplifier (corresponding to image 3 The high-frequency power amplifier shown above) is used for variable control of the output. For example, it is composed of a heterojunction bipolar transistor (HBT) formed on a GaAs compound semiconductor substrate, and is integrated with the transistor circuit that constitutes the high-frequency power amplifier. circuitized.

[0024] GaAs-HBT does not have a p-pit like Si bipolar transistors in the device structure, and is only composed of npn transistors, and the maximum base-emitter voltage is, for example, 1.4V. In the transistor integrated circuit that constitutes the bias control circuit, between a DC voltage source such as a battery and the ground, GaAs-HBTs are stacked in up to two stages, thereby facilitating the integration of the bias control circuit, and at t...

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PUM

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Abstract

The bias control circuit includes a voltage conversion circuit, the voltage conversion circuit includes a differential amplifier composed of two pairs of transistors and inputs a control voltage to an inverting input terminal, and performs low-impedance conversion on a non-inverting output terminal of the differential amplifier and converts The output voltage obtained after that is used as the bias control voltage of the high-frequency power amplifier to output the output transistor. The voltage conversion circuit realizes such a low output impedance voltage follower circuit, which fully feeds back the output voltage of the output transistor to the non-inverting input terminal of the differential amplifier, and feeds back the inverting output voltage of the differential amplifier to the differential amplifier the inverting input terminal.

Description

technical field [0001] The present invention relates to a bias control circuit for high-frequency power amplifiers, in particular to a bias current suitable for controlling high-frequency power amplifiers to control the output power of high-frequency power amplifiers and the transmission of mobile phones equipped with such high-frequency power amplifiers. Bias control circuit for variable output control. Background technique [0002] The transmission output of the mobile phone does not necessarily maintain the highest level. If the distance to the base station of the other party is short, the transmission output can be reduced. Under normal circumstances, the transmission output of about 1 / 10 of the highest level can fully and stably use the mobile phone. This reduces the transmission output, prevents waste of power, effectively utilizes the capacity of the rechargeable battery as the driving source of the mobile phone, and ensures the long-term use of the mobile phone. ...

Claims

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Application Information

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IPC IPC(8): H03F1/30H03F3/24H03F3/45H03G3/02
CPCH03F1/302H03F3/45085H03F2203/45498H03F2203/45622
Inventor 四宫义隆中川准一
Owner MOBILE COMM TOKYO