JFET gate grounding preamplifier circuit diagram

Published:2011/9/15 1:38:00 Author:Rebekka | Keyword: JFET gate grounding preamplifier | From:SeekIC

Figure 1-1 is the example of joint types FET 2SK125(SONY) grounded gate amplifier. So when you use the gate grounding circuit, you could separate the input and output by using the grounding gate electrode on printing copper foil. The power gain of the circuit is about 10~12dB, NF is about 2dB. The LC value in the circuit change with frequency. You should choose table 1-1, and L1, L2 are at toroidal core amine line of poly resin. The diameter is about 0.3mm. It should insert in the substrate directly to avoid producing stray capacitance. You could Adding a source of resistor where you want to adjust and keep the drain current being about 10mA. In addition, adjusting trimmer condenser can get the highest sensitivity.



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