Log amplifier with temperature compensation function
A logarithmic amplifier and temperature compensation technology, applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as poor accuracy, small detection range, and complicated steps , to achieve the effect of suppressing the influence of
Inactive Publication Date: 2012-09-12
东南大学无锡分校
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Problems solved by technology
Although received signal strength detection can be implemented in the digital domain, the steps are complicated, the detection range is small, and the accuracy is poor
At present, the received signal strength detection is mainly realized by the method of analog circuit, but the detection result of the received signal strength detector implemented by most analog circuits is linear with the input signal amplitude
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[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] The present invention provides a temperature compensation method that does not require off-chip components. This method utilizes the characteristic that the bias current of the bipolar transistor in the bandgap reference is proportional to the absolute temperature, and the on-resistance of the PMOS transistor operating in the linear region is only controlled by its gate-source voltage, so that the basic logarithmic amplifier The temperature drift characteristic of the coefficients of the resulting logarithmic signal is compensated.
[0023] The invention provides a logarithmic amplifier with temperature compensation function. In order to implement it in the form of an integrated circuit, the characteristic that the bias current of the bipolar transistor in the bandgap reference is proportional to the absolute temperature and the gate-source voltage on the workin...
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The invention provides a log amplifier with a temperature compensation function. The log amplifier comprises a basic log circuit, a temperature compensation circuit, a temperature compensation auxiliary circuit and a P-channel metal oxide semiconductor (PMOS) transistor grid voltage control loop, wherein the basic log circuit performs log conversion on an input signal, and the log signal has a coefficient which is directly proportional to absolute temperature; the temperature compensation circuit is used for eliminating a temperature coefficient of the log signal; the temperature compensation auxiliary circuit is used for eliminating direct current offset of the temperature compensation circuit along with temperature change in the process of eliminating the temperature coefficient and finally obtaining a log signal which is not changed along with the temperature; and the PMOS transistor grid voltage control loop is used for controlling temperature of the temperature compensation circuit and the temperature compensation auxiliary circuit. Therefore, the system complexity caused by the traditional off-chip thermistor and digital correction so as to eliminate the influence of temperature change is avoided, and the integration level of an application system is improved.
Description
technical field [0001] The invention relates to a logarithmic amplifier with temperature compensation function implemented in the form of an integrated circuit. Taking advantage of the fact that the on-resistance of metal-oxide transistors operating in the linear region is mainly controlled by their gate-source voltage, the absolute temperature-proportional nature of the bias current from the bandgap reference and the basic logarithmic amplifier The characteristic that the coefficient is proportional to the absolute temperature is offset, and the subtractor is used to eliminate the DC offset that is proportional to the absolute temperature introduced by the above compensation method, and the temperature compensation is completely realized on-chip. Background technique [0002] Logarithmic amplifiers have always played an important role in signal compression and computing. Even though digital integrated circuits have almost entirely replaced log amps in computing application...
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Inventor 吴建辉白春风陈超赵强王旭东张理振温俊峰王陈浩
Owner 东南大学无锡分校