522 5-T OTA
522 : 5-T OTA
- Author: S Mishra
- Description: A simple 5-Transistor operational amplifier with external bias current
- GitHub repository
- Clock: 0 Hz
How it works
Apply a VDD of 1.8V and VSS ground. Then apply a 1uA current to BIAS pin. Then apply 0.9V to MINUS pin, while applying a voltage of 0-1.8V on PLUS pin in 10mV steps. Observe the DIFFOUT pin and check that DIFFOUT shoots up to 1.8V when PLUS is greater than MINUS by 10mV.
How to test
Observe the DIFFOUT pin and check that DIFFOUT shoots up to 1.8V when PLUS is greater than MINUS by 10mV.
External hardware
Power Supply, Sourcemeter for currents, Multimeter to measure voltage.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | |||
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B4 | 10 | DIFFOUT |
| 1 | B1 | 7 | BIAS |
| 2 | B3 | 9 | MINUS |
| 3 | B2 | 8 | PLUS |