Triode amplification circuit characteristic parameter measuring instrument

Abstract

The invention relates to the technical field of teaching instruments and equipment, in particular to a triode amplification circuit characteristic parameter measuring instrument which comprises a microcontroller, a DDS, a voltage-controlled attenuator, an input impedance network, a multi-channel voltage-controlled amplifier, a multi-channel detector, a high-precision ADC, a high-speed ADC and an output impedance network. The microcontroller controls the DDS to generate a voltage signal; the programmable attenuator, the input impedance network and the output impedance network are controlled toadjust input and output signals of the tested triode amplification circuit; output signals of the three modules are sent to a multi-channel programmable amplifier, the high-speed ADC, the multi-channel detector and the high-precision ADC to obtain an A / D sampling value, and the microcontroller analyzes the sampling value through an algorithm to obtain characteristic parameters of a tested circuitand sends the characteristic parameters to a serial port screen and a network module. Parameters such as input and output impedance, magnification times, frequency response, harmonic distortion and the like of the amplification circuit can be rapidly and accurately measured, a remote interaction function is realized, and the instrument can be used as a college experiment teaching instrument.

Description

Technical field [0001] The invention relates to the technical field of teaching instruments and equipment, in particular to a measuring instrument for characteristic parameters of a triode amplifier circuit. Background technique [0002] In the current teaching of electronic circuit courses in colleges and universities, it is often necessary to measure the input and output impedance, magnification, frequency response, harmonic distortion and other characteristics of the triode amplifier circuit, and it involves three configurations of common emission, common base and common collection. Measurement teaching. However, in current teaching, it is generally necessary to use signal generators, oscilloscopes and other instruments to measure. The measurement process is very cumbersome, time-consuming, and measurement accuracy is average. More importantly, the cumbersome measurement process will affect students’ learning. Enthusiasm leads to lower enthusiasm for learning and poor teachin...

AI Technical Summary

Problems solved by technology

[0004] However, it still has the problem of slow measurement speed and poor accuracy, which seriously affects the quality of teaching and the enthusiasm of students for learning; it cannot satisfy the need to treat different parameters differently. For example, for parameters with high measurement speed requirements, the measurement speed is given priority , for parameters with higher precision, give priority to its precision

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