271 Tiny Opamp

271 : Tiny Opamp

  • Author: argunda
  • Description: Super simple two stage opamp without miller compensation
  • GitHub repository
  • Clock: 0 Hz

How it works

This opamp has VDD=1.8V and VSS=0V. It's input common mode range is not very good so make sure your AC input signal is centered around 0.9V. The opamp is internally biased so you just need to apply a differential input.

It should be able to hit 60dB gain at low frequencies. Please do not connects loads requiring more than a few mA.

How to test

Power up the chip, test opamp in closed loop configuration only. VOUT is analog pin 0. PLUS is a differential input on analog pin 1. MINUS is a differential input on analog pin 2.

External hardware

At the bare minimum a resistor at the output is needed to test the opamp as a source-follower. Use multimeter or oscilloscope to probe the output.

IO

#InputOutputBidirectional
0pauseblue
1new_gamegreen
2down_keyred
3up_keyhsync
4vsync
5speaker
6col0
7row0

Analog pins

uaanalogDescription
011VOUT1
16PLUS1
210MINUS1
37VOUT2
49PLUS2
58MINUS2

Chip location

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