Single-end to double-end differential analog circuit

Abstract

The invention discloses a single-end to double-end differential analog circuit, which comprises a transistor differential cascade amplification / attenuation circuit, an AC compensation circuit, a high-frequency compensation circuit, an emitter following feedback circuit and a constant current source circuit, wherein the transistor differential cascade amplification / attenuation circuit respectively reverse a single-end input signal through different transistors and generates double-end differential positive end and negative end signals, the amplitudes of the double-end differential signals are the same and the phase difference is 180 degrees; DC bias is superposed by an input end at the other end of the transistor differential cascade amplification / attenuation circuit, the AC compensation circuit and the high-frequency compensation circuit respectively provide corresponding AC compensation and high-frequency compensation for the transistor differential cascade amplification / attenuation circuit, common mode voltage is overlapped at an output end of the transistor differential cascade amplification / attenuation circuit through the emitter following feedback circuit, the constant current source circuit provides a constant current source, and the analog circuit controls limit voltage of the output differential signal. The circuit has the advantages of low cost, high cost performance, high device universality and the like.

Description

technical field [0001] The invention relates to the field of measuring instruments and meters, in particular to a single-end to double-end differential analog circuit. Background technique [0002] Measuring instruments usually require high-speed, high-bandwidth input signal processing capabilities in order to meet the actual application requirements of the product. The high-speed, high-bandwidth signal processing also puts forward higher requirements for circuit design. ADC chips are usually used inside measuring instruments to digitally convert input analog signals, and current high-speed ADC chips all use double-ended differential analog inputs. However, the analog signal input by the instrument is a single-ended input, which requires a circuit to realize the conversion from single-ended to double-ended differential without distortion of the signal. [0003] At present, the circuit function of single-ended to double-ended differential is usually implemented by imported ...

AI Technical Summary

Problems solved by technology

However, the op amp chip itself is expensive, and the procurement channels are often limited, which restricts the application design of the product and the improvement of cost performance to a certain extent.

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