GA5G9

[China Jiliang University] Differential amplification circuit measuring instrument Little Bee (Yang Zhitao, Su Wanli, Shi Yonglin)

Overview

Topic requirements:

( 1 ) Build a triode differential amplifier circuit according to the circuit shown in Figure 2 , and debug it to make it work properly.

Work regularly. The transistor uses 9013 . ( 15 marks)

Figure 2 Transistor differential amplifier circuit

( 2 ) Design a differential signal source to test the performance of the amplifier produced, and generate 2

Test differential signals used ( 30 points). Meet the following requirements:

Common mode signal voltage range: 0V~1V , 10mV step.

Differential mode signal voltage range: amplitude ( 0-100mV ), 10mV step; frequency range

Range: 100Hz~1MHz , 100Hz step.

The common mode signal voltage and differential mode signal amplitude can be set, and the differential mode signal frequency can be set

Set.

The parameter indicators displayed by the tester are different from those observed through the oscilloscope measurement.

The parameter index error does not exceed 5mV .

( 3 ) Measure the magnification and display the record. ( 15

point)

Measure the voltage amplification factor of the amplifier A = / at 1KHz .

( 4 ) Input resistance measurement ( 15

point)

The input resistance of the amplifier was measured at 1KHz = / .

( 5 ) Measure the amplitude-frequency characteristics of the differential amplifier circuit and display it on the LCD screen to calculate the above

limited cutoff frequency.

Introduction to the work: This work uses AD9833 as the signal source, and uses microcontroller programming to control the amplitude and frequency steps. The signal source passes through a single-ended to differential circuit to generate differential mode signals and common mode signals, which are output to the adjusted differential amplifier circuit. The output signal is then converted from double-ended to single-ended and attenuated and boosted to generate a signal suitable for microcontroller measurement. In the measurement part, on the basis of realizing all the measurement indicators of the question, we also implemented a simple oscilloscope and spectrum analyzer based on stm32 to display data and waveforms.

Design Files

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