V/I convertor with temperature compensation
A temperature compensation and converter technology, applied in the field of electrical signal conversion, can solve problems such as temperature drift, inaccurate voltage and current conversion, and achieve the effect of solving temperature drift
Active Publication Date: 2014-12-17
SHENZHEN ZHENHUA MICROELECTRONICS
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[0003] The purpose of the embodiment of the present invention is to provide a V / I converter temperature compensation circuit, which aims to solve the problem of inaccurate voltage and current conversion due to temperature drift in the V / I converter composed of operational amplifiers
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[0013] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0014] The invention provides a temperature compensation circuit capable of adjusting temperature variation, and compensates the V / I conversion circuit so that the output current temperature stability of the V / I converter is less than 1uA / °C or a certain set variation. The temperature compensation circuit of the present invention has the characteristic of adjustable temperature variation.
[0015] Such as figure 1 As shown, the basic principle diagram of the V / I converter with temperature compensation provided by a preferred embodiment is shown. For the convenienc...
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The invention provides a V / I convertor with temperature compensation. The V / I convertor is suitable for electrical signal conversion and comprises a first operational amplifier, a reference resistor, a differential ratio operational circuit and a zero setting and temperature compensation circuit. Voltage signals to be converted are connected into the first operational amplifier. The reference resistor outputs converted current signals. The differential ratio operational circuit provides feedback voltage signals for the first operational amplifier. The zero setting and temperature compensation circuit comprises a transistor, and outputs compensation voltage signals to the reverse phase input end of the first operational amplifier, and the compensation voltage signals comprise temperature compensation voltage signals and adjustable zero setting voltage signals output according to the voltage drop temperature characteristic of the transistor. The output of a reverse phase summator is adjusted according to the forward voltage drop temperature characteristic of the transistor, the temperature compensation quantity value of a V / I conversion circuit can be adjusted, the output of the reverse phase summator is adjusted through zero setting voltages, and the conversion precision error of the V / I convertor circuit caused by the offset voltage of the operational amplifier, resistor precision and other reasons is compensated.
Description
technical field [0001] The invention belongs to the field of electric signal conversion, in particular to a temperature compensation circuit of a V / I converter. Background technique [0002] The voltage-current conversion circuit (V / I converter) is a very common unit circuit in sensor signal processing or precision instrumentation circuits. At present, the V / I converter circuit composed of operational amplifiers is widely used, but the temperature characteristics of the operational amplifiers and other resistance devices that constitute the V / I converter cause the V / I converter to have a certain temperature offset. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a temperature compensation circuit for a V / I converter, aiming at solving the problem of inaccurate voltage and current conversion due to temperature drift in a V / I converter composed of an operational amplifier. [0004] The embodiment of the present invent...
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IPC IPC(8): G05F1/56
Inventor 李旋球赵勇张磊钟成黄晓伟
Owner SHENZHEN ZHENHUA MICROELECTRONICS