How to stop oscillation in power amplifier?

07 July 2019 1 3K Report

I am trying to bias Toshiba TIM1314-9L Power amplifier. When I start biasing up it shows short and I think oscillation is happening. How to prevent oscillation and bias this amplifier?

Alan Victor

There is a recommended gate R of 150 ohms. Are you incorporating this resistance in your gate BIAS TEE network? You must provide a low frequency gain reduction or stabilization network as low frequency gain is quite large. The drain bias tee network also requires low frequency gain suppression. Large decoupling C as well shunt inductance to supply drain voltage should be free of parasitic resonance.

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