![]() The LTC6911 also has a relatively low input impedance as well which you might need to be careful of.Ī “traditional” voltage controlled amplifier (VCA) is another option. You need to read datasheets of such devices carefully though to make sure they meet your needs with respect to common mode input voltage range, bandwidth and noise, for example. You can buy programmable gain amplifiers such as the Linear Technology LTC6911 which will give selectable gains of 0dB to 20dB. The cut off frequency can be 10kHz to 150kHz and the gain 0dB to 24.1dB. There are some specialized solutions such as the LTC1564 which is a digitally controlled anti-aliasing filter with 4 bit programmable gain amplifier which might be useful as the stage preceding an analog to digital converter (ADC). ![]() If you circuit doesn’t use an instrumentation amplifier or you need some adjustable gain after an instrumentation amplifier then you need to look at alternatives. The AD8557 has an adjustable gain using digital potentiometers and a programmable offset using a digital to analog converter (DAC). If you need a digitally adjustable instrumentation amplifier then there are ready-made solutions such as the analog devices AD8557 from Analog Devices. When you need the adjustment under digital control then it becomes more complicated. ![]() If the adjustment is manual then it is pretty straightforward - you can use a potentiometer. ![]() It is not uncommon to need an adjustable gain in an analog signal processing chain. ![]()
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