Note: Since the accuracy of the circuit is not very accurate, the final output has a certain error. It is possible that the waveform amplitude cannot reach 10Vpp, and there may be problems such as waveform clipping. These are normal conditions.. Waveform

Note: Since the accuracy of the circuit is not very accurate, the final output has a certain error. It is possible that the waveform amplitude cannot reach 10Vpp, and there may be problems such as waveform clipping. These are normal conditions.

五、 Waveform display

Note: Due to the influence of the amplitude-frequency characteristics, the amplitude of the waveform will decrease as the frequency increases.

六、 Analog-to-digital conversion (AD) circuit

As shown in the hardware structure diagram, the AD circuit consists of a high-speed AD chip, an attenuation circuit, and a signal input interface.

The high-speed AD chip we use is an 8-bit version from AD, with a maximum sampling rate of 32MSPS.

AD9280 chip. The internal structure diagram is shown below

According to the configuration shown below, we set the AD voltage input range to: 0V~2V.

Before the signal enters the AD chip, we built an attenuation circuit with an

The input range of the interface is -5V~+5V (10Vpp). After attenuation, the input range satisfies the input range of the AD chip

(0~2V). The conversion formula is as follows:

When the input signal Vin = 5 (V), the signal input to AD Vad = 2 (V);

When the input signal Vin=-5(V), the signal input to AD Vad=0(V);

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