Logarithmic current-to-voltage conversion circuit with temperature compensation function

Abstract

The invention discloses a logarithmic current-to-voltage conversion circuit with a temperature compensation function. The circuit comprises a logarithm stream voltage transformation buffer unit, a positive temperature coefficient compensation unit and a self-heating unit, the logarithm stream voltage transformation buffer unit is provided with a reference circuit consistent with a basic logarithmcircuit, and a difference value Vbe between the output of the basic logarithm circuit and the output of the reference circuit correspondingly reflects a temperature coefficient; the positive temperature coefficient compensation unit is provided with a first-stage voltage-to-current circuit and a second-stage current mirror; a voltage Vout is output through an external resistor R2, the input end ofthe positive temperature coefficient compensation unit is connected with Vbe, a resistor R0 and an adjustable resistor R1 which are connected in series are arranged in the voltage-to-current circuit,and the value of the adjustable resistor R1 is adjusted to correct the temperature coefficient of (R1 + R0) / R2. By applying the circuit structure design, the temperature compensation is completely realized in a chip, so that a system applying the circuit can be integrated by a single chip, and the simulation result of the circuit shows that the output is more stable along with the temperature change.

Description

technical field [0001] The invention relates to a circuit design with temperature compensation function implemented in the form of an integrated circuit, in particular to a logarithmic current conversion circuit with temperature compensation function. Background technique [0002] With the rapid development of electronic application technology and the development of the hardware foundation, microelectronics is also constantly breaking through and developing in the face of emerging technical problems. In the microelectronic design of many application systems, especially on the basis of the photoelectric conversion hardware developed in the communication field, the current input to the microelectronic system after signal conversion is usually a current with a very large dynamic range, and it needs to be converted for further system operations is a voltage signal. Most of the existing traditional solutions use the architecture of operational amplifier combined with triode to r...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a logarithmic flow conversion circuit with temperature compensation function to solve the problem of temperature stability of logarithmic signal conversion devices

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