A Dual Power Amplifier Circuit

Abstract

The invention discloses a dual-power power amplifier circuit, comprising an input circuit, a bias circuit, and an output circuit. The bias circuit is formed by a NPN transistor V4, resistors R2-R4, a capacitor C3, and a digital bias circuit. The digital bias circuit comprises a field-programmable gate array FPGA, a opto-coupler isolation circuit, and a programmable digital potentiometer D1. Two output ends of the programmable digital potentiometer D1 are respectively connected with the other end of the resistor R2 and the other end of the resistor R3. The field-programmable gate array FPGA is used to generate a control signal of the programmable digital potentiometer, and the programmable digital potentiometer generates required variable resistance, to form a VBE expansion circuit, so as to adjust bias voltage of a power tube. The dual-power power amplifier circuit realizes digital design of a bias circuit, prevents crossover distortion, and realizes automatic calibration.

Description

technical field [0001] The invention relates to the related technical field of semiconductor device analysis, in particular to a dual power supply power amplifier circuit. Background technique [0002] With the development of semiconductor device manufacturing technology, power electronics technology and the demand for complex automatic testing, conventional voltage-current (IV) measurement and capacitance-voltage (CV) measurement can no longer meet the needs of semiconductor device testing, and high-precision high-current pulses are required source to test its dynamic performance characteristics. [0003] The block diagram of a commonly used DC input high current pulse source is as follows: figure 1 shown. Composed of DC-DC conversion, pulse generation, control circuit, drive isolation circuit, sampling circuit, auxiliary power supply and man-machine interface, there are three key circuits in the block diagram: DC-DC conversion, pulse generation and control circuit, espec...

AI Technical Summary

Problems solved by technology

When using diodes for bias compensation, the bias voltage is not easy to adjust, so it is not often used

Designers typically use V BE Expand the circuit for bias compensation, and calibrate the bias voltage before the product leaves the factory. However, when analyzing and testing semiconductor devices, due to the different test environments, especially the influence of ambient temperature, the characteristics of the power tube of the dual-supply power amplifier circuit will change. , the bias voltage needs to be automatically calibrated, otherwise there will be crossover distortion

Images