OPA192: Howland current source loop stability simulation of OPA192

li cunxu

Part Number: OPA192

Hi TI expert

The attachment shows the function of Howland current source amplification. How to simulate loop stability in this form? Thank you!

opa192 howland+mos.TSC

1 month ago

+1 Art Kay 1 month ago

TI__Mastermind 29258 points

Li,

The best method to test this circuit is described in Operational Amplifier Stability Theory and Compensation Methods section 3.3. Below is the test done on your circuit. The phase margin is 77deg, so the circuit is very stable. Even though the circuit is stable, I do recommend adding two feedback capacitors. The feedback capacitors help reduce noise and improve stability.