1x, 10x, 100x, 1000x Switched-Gain Instrumentation Amplifier

A programmable Switched-Gain Instrumentation Amplifier is analyzed in this analog circuit design video. How does the circuit work? and what are the programmable gain values that can be realized using two control bits. This is the 206th analog circuit video. For more example see the analog video playlist • Electrical Engineering... . This Switched-Gain amplifier is implemented with three Op Amps, two analog multiplexers (analog switches) sharing common two-bit control and few resistors. All Op Amps are properly biased with dominant negative feedback that enforces virtual short. The programmable gain of this analog amplifier is computed and shown to be 1, 10, 100 and 1000 depending on the four positions of the analog switch.

[@user-wj8vl7co1g]

your videos are awesome.

[@STEMprof]

You're very welcome! Glad you like my videos. Thank you!

[@pikaonyoutube2139]

Nice explaination 😊

[@STEMprof]

Thank you! Glad that you liked the analysis and explanation in this amplifier video. 🙏

[@ahmedmoustafa6829]

Perfect video
Do you know any IC which can provide switched gain?

[@STEMprof]

You are welcome. Glad that you liked this video. For Analog Multiexer (switch), Intersil HI-509 or HI-508 are good choices. BTW, new smaller playlists are now in my channel focused on specific analog circuit topics. I hope this is helpful.

[@STEMprof]

A programmable Switched-Gain Instrumentation Amplifier is analyzed in this video. Here are few more examples:
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For more example see the analog video playlist ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html I hope these Circuit design and analysis videos are interesting.