| Electronics > Projects, Designs, and Technical Stuff |
| Common source amplifier and resistor values |
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| Frederico Acardi:
Hi. I want to design a Common Source Amplifier. I will be using an lnd_150 : http://ww1.microchip.com/downloads/en/DeviceDoc/LND150-LND250-N-Channel-Depletion-Mode-DMOS-FETs-Data-Sheet-20005454A.pdf I need to get the most gain out of the mosfet. Yet, I don't understand how to choose the q-point for the lowest distortion (symetrical amplification) when you start from scratch with this circuit. What do I have to choose first ? Rd value, Id value, Gate voltage bias value ... ? The only thing I know is VDD=320Vdc. The Input signal will be 1.74Vpeak +4dbu. The load is 470K. And I have read "Allow 1/3VCC across Rd, Vds and R2". I could allow 1/3 VDD=107V to the gate with a 3M//1M (R1//R2). But why 1 third ? I am lost, can someone help me with a step by step how to do it, with real world numbers, not only formulas please. I will use this circuit : If you need more information I will add them. Sorry for this but I am still learning and never took an electronic class. Thank you. |
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