Voltage-to-current circuit and device

Abstract

The invention provides a voltage-to-current circuit and device. The voltage-to-current circuit and device comprises a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a first current mirror and a second current mirror, wherein the first amplifier is used for receiving positive phase voltage signals of differential voltage signals, the second amplifier is connected with the first amplifier to form a first feedback loop and used for converting the positive phase voltage signals into first current signals, the third amplifier is used for receiving negative phase voltage signals of the differential voltage signals, the fourth amplifier is connected with the third amplifier to form a second feedback loop and used for converting the negative phase voltage signals into second current signals, the first current mirror is used for copying the first current signals by the ratio and outputting positive phase currents, and the second current mirror is used for copying second current signals and outputting negative phase currents, wherein the positive phase currents and the negative phase currents are combined into differential currents. A cascade amplifier and a common-source amplifier are adopted to form the feedback loops, the two feedback loops use the same current source, so that output currents are stabilized at a constant value, and linearity and accuracy are improved.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and relates to analog signals or mixed signals, specifically a voltage-to-current circuit and device with high linearity and high input impedance. Background technique [0002] In integrated circuit design, involving high-performance analog / mixed-signal integrated circuits such as digital-to-analog converters, phase-locked loops, and clock duty ratio adjustment circuits, it is necessary to linearly convert voltage signals into current signals. [0003] However, the current voltage-to-current circuit has the disadvantages of complex structure, occupying too much chip area and power consumption. When it is necessary to meet the requirements of a simple structure, it is necessary to introduce too many nonlinear electronic devices, which cannot convert voltage into current. High linearity. [0004] For example, the voltage-controlled oscillator (VCO) in the phase-locked loop circuit usually uses a...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a voltage-to-current circuit and device for solving the problem that high linearity and high input impedance cannot be satisfied at the same time in the prior art

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