High-matching high-precision voltage difference generating circuit

Abstract

A high-matching high-precision voltage difference generating circuit comprises a control signal generating circuit and a voltage difference circuit. The control signal generating circuit comprises a clock chip and a control circuit, the clock chip comprises two input ports and a plurality of signal output ports, the signal output ports are connected with the control circuit, the control circuit receives electric signals of the signal output ports and distributes a power source into two output circuits to output through current output ports, and the two output circuits are unchanged in difference value. The current output ports of the control circuit are connected with the voltage difference circuit, and the voltage difference circuit comprises triodes used for forming voltage difference. The high-matching high-precision voltage difference generating circuit has advantages that voltage difference is formed by clock control signals for controlling a duty ratio and triode connection, eachcircuit of current is sampled, the voltage difference is only associated with the duty ratio of the clock control signals and parameters of the triodes, low process influences are realized, and the defect of current mirror mismatching is overcome.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a high-matching and high-precision voltage difference generating circuit. Background technique [0002] The existing voltage difference generation circuit generally adopts the working mode of the current mirror to copy a current to form a voltage difference between two ports connected with resistors. [0003] However, the current copied by the current differential voltage generation circuit through the current mirror is greatly affected by the process, and the mismatch is obvious. Contents of the invention [0004] Based on this, it is necessary to provide a high-matching and high-precision differential voltage generating circuit for the problem that the current copied by the current mirror is greatly affected by the process and the mismatch is obvious in the current differential voltage generating circuit. [0005] A high-matching and high-precision voltage difference gener...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a high-matching and high-precision differential voltage generating circuit for the problem that the current copied by the current mirror is greatly affected by the process and the mismatch is obvious in the current differential voltage generating circuit.

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