problem with mosfet amplifier circuit

rakirajueee08 · Sep 20, 2013

I have a problem with my amplifier circuit.My input to gate of mosfet is 2Mhz from microcontroller and bias voltage is 30v.when I measure voltage at the terminal of the dc blockin capacitor as i have given in the following picture it shows voltage low close to zero and the frequency about 300 khz.what is the problem ?Because according to the principle it should give amplified voltage and frequency the same at the input is 2 Mhz.please help me someone.

chuckey · Sep 21, 2013

From the data sheet ( https://www.futurlec.com/Transistors/IRF510.shtml ) you need at least a +4V input to the gate to switch the fet s drain current on, are you getting this at the gate? - which should have a DC return to the drain (100K ?)
frank

erikl · Sep 22, 2013

chuckey said:
... gate? - which should have a DC return to the drain (100K ?)
frank

Hi frank, you probably meant

... return to the source

I think ..
erikl

rakirajueee08 · Sep 22, 2013

yes i geeting that required current .now i am giving the 2mhz signal from a signal generator .it is not working ? what can i do and what could be the problem?

chuckey said:
From the data sheet ( https://www.futurlec.com/Transistors/IRF510.shtml ) you need at least a +4V input to the gate to switch the fet s drain current on, are you getting this at the gate? - which should have a DC return to the drain (100K ?)
frank

problem with mosfet amplifier circuit

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