Fuse calibration unit circuit of current steering DAC

Abstract

The invention discloses a fuse calibration unit circuit of a current-steering DAC (Digital-to-Analog Converter), which belongs to the field of integrated circuits and comprises a first D trigger, a second D trigger, a third D trigger, an OR gate, a first AND gate, a second AND gate, a fuse resistor, a first PMOS (P-channel Metal Oxide Semiconductor) tube, a first NMOS (N-channel Metal Oxide Semiconductor) tube, a second NMOS tube, a buffer and a second PMOS tube, wherein the Q end of the first D trigger is connected with the OR gate and the first AND gate, and the QN end is connected with the first AND gate; the QN end of the second D trigger is connected with the OR gate and the first AND gate; the Q end of the third D trigger is connected with the first AND gate and the second AND gate; the output end of the OR gate is connected with the gate end of the second PMOS tube; the source end of the second PMOS tube is connected with the power supply VDD, and the drain end is connected with the output end of the buffer; the output end of the first AND gate is connected with the gate end of the first PMOS tube, and the output end of the second AND gate is connected with the gate end of the first NMOS tube; the fuse resistor is respectively connected with the source end of the first PMOS tube and a power supply VDD, the drain end of the first PMOS tube is connected with the drain end of the first NMOS tube and is input to the buffer, and the source end of the first NMOS tube is connected with the ground GND.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a fuse calibration unit circuit of a current steering DAC. Background technique [0002] The current steering DAC usually includes a decoding circuit, a switch array, and a power source array. The decoding circuit decodes the input digital signal to obtain a switch signal, and controls the opening and closing of the current source in the current source array, so as to obtain the corresponding input signal. Output analog current value. Among them, the power source array of the current steering DAC is composed of independent current sources with different weights, and the theoretical value of each current source is usually in a corresponding proportional relationship according to the actual design. However, in the actual device production process, the nonlinear mismatch caused by process deviation is inevitable, resulting in a large deviation between the actual value o...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a fuse calibration unit circuit of a current steering DAC, to solve the problem that in the production process of the actual device, the nonlinear adaptation caused by the process deviation causes the actual value of the current source to deviate from the theoretical design value, thereby The problem of device performance deterioration

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