Electronic – Function Generator Voltage and Current handling

currentfunction generatormosfetvoltage

I am using this Function Generator

My circuit :

enter image description here

FG input : 5V peak to peak. 1kHz. 1ms time period. 90% duty.

I want to understand the below questions :

  1. Is it safe to do this connection?

  2. I have read that we need to take care whether the input BNC channel output of the FG should be capable of handling the voltage and current? Which is the voltage it must handle and what is the sink current?

  3. How to check in the datasheet of the FG regarding this?

Actually, the FG output BNC channels only produce output voltage right? How to check how much of input voltage that they can handle when they are impressed on those channels?

Best Answer

  1. No. This will burn out your MOSFET as there is nothing to limit the current from drain to source. This should not harm your function generator, since the MOSFET's gate will not draw current other than to satisfy its capacitance.

  2. This unit has a 50 Ω output capable of ±20 V into high impedance or open circuit (±10 V if the frequency is > 25 MHz). Into a 50 Ω load it can do ±10 V (±5 V if the frequency is > 25 MHz). You can use Ohm's Law to derive the currents if that is of interest to you.

  3. Output impedance and voltage range is listed on page 4 of your datasheet under "General Characteristics - Amplitude".

Related Topic