A circuit for adjusting voltage based on temperature
A technology for adjusting voltage and reference voltage, applied in the field of electronics, can solve the problems of not being able to meet the needs of different bias voltages for power amplifiers, and unable to maintain good performance, etc.
Inactive Publication Date: 2016-02-10
广州钧衡微电子科技有限公司
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Problems solved by technology
[0004] However, in the above-mentioned technology of using LDO to control the power amplifier, because the material of the power amplifier is highly sensitive to temperature, different temperatures require different bias voltages. Therefore, using LDO to provide a bias voltage with a fixed temperature coefficient The design of the voltage cannot meet the technical problem that the power amplifier needs different bias voltages due to its own different temperatures, so that the power amplifier cannot maintain good performance at high temperature or low temperature.
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[0041] An embodiment of the present invention provides a circuit for adjusting voltage based on temperature. The first voltage and the second voltage are predetermined by preset temperature nodes, and then the first voltage and the reference voltage are output to the comparison module for voltage value comparison, and according to The comparison result outputs a signal corresponding to the result to control the logic switch to output the first voltage or the second voltage, which realizes the function of the power amplifier switching different bias voltages according to different preset temperatures, thereby further ensuring the working performance of the power amplifier .
[0042] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the pr...
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The embodiment of the invention discloses a circuit for adjusting voltages based on the temperature. A first voltage and a second voltage are determined in advance according to a preset temperature node, the first voltage and a reference voltage are output to a comparison module to carry out the voltage value comparison, a signal corresponding to the result is output according to the comparison result to control a logic switch to output the first voltage or the second voltage, and therefore a power amplifier can switch different bias voltages according to different preset temperatures, and work performance of the power amplifier is better guaranteed. The circuit comprises a band-gap reference module, the logic switch and the comparison module, the band-gap reference module outputs the first voltage and the second voltage to a first input end and a second input end of the logic switch, outputs the reference voltage and the first voltage to the comparison module to be compared and outputs a control signal to the logic switch.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a circuit for adjusting voltage based on temperature. Background technique [0002] A power amplifier (poweramplifier) refers to an amplifier that can generate maximum power output to drive a load under a given distortion rate condition, especially when the power amplifier is used in today's 3G technology, the control circuit of the power amplifier often uses voltage The control mode controls the linearity and gain of the power amplifier. [0003] The existing power amplifier voltage control technology usually provides a bias voltage with a fixed temperature coefficient to the first stage and the second stage of the power amplifier through an LDO (linear regulator), so that the power amplifier can work normally. [0004] However, in the above-mentioned technology of using LDO to control the power amplifier, because the material of the power amplifier is highly sensitive to...
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IPC IPC(8): G05F1/46
Inventor 刘威
Owner 广州钧衡微电子科技有限公司