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Programmable gain amplifier principle explained

Programmable Gain Amplifier (PGA)

Programmable Gain Amplifier is an amplifier with digital control of gain through MCU. Most of the programmable gain amplifiers nowadays are relatively expensive and generally have small bandwidth.

So we make a simple programmable gain amplifier by a simplified way. The following figure.

We can see from the above figure that we control the gain by adjusting the size of the feedback resistor. The feedback resistance is adjusted by relay, there are only two cases in the figure, if there are more feedback resistors and more relays, then it can achieve multi-range adjustment. vg2 is the analog MCU control relay.

We can see by the above diagram that the theory matches the reality, and in the case of very few gain ranges, we can achieve it in this way, and the same can be achieved by using MCU with voltage control amplifier.

This design can not only achieve the desired effect, but also low cost, high accuracy, and with different amplifiers can get a larger bandwidth, but at the same time this way when too many gears are controlled, the gear switching speed is slower if using relays as switches.

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