Voltage Controlled Voltage Source

  
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The disadvantage of the circuit above is that the supply of the op-amp is tied to the HV supply. Most op-amps are limited to around 30V on the supply, so the circuit wont work for higher output voltages. The circuit below avoids this this problem by inserting a n-channel mosfet, which can be fully controlled within the range of the op-amps power s
Voltage Controlled Voltage Source - schematic

upply. The output voltage is directly proportional to the control voltage. R1 and R4 should be chosen such that Vgs(max) of Q2 is never exceeded. Likewise Q2 should have an Idss greater than VHV. The circuit below is a voltage controlled voltage reference. The output voltage is directly proportional to the control voltage. Note that the control voltage and feed back input of the op-amp is swapped. The capacitor stops oscillation, and should only be placed on the output. The circuit will tend to oscillate if a capacitor is placed across the feedback network, for example across R9. Do you need help with an electronics design Daycounter provides contract electronics design services. Contact us to give you a quote on your electronics design project.



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