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cascode amplifier active preselector circuit

2015-01-31 15:37  
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cascode amplifier active preselector circuit
The following picture shows the circuit with a cascode VHF pre-amplifier formed by two pieces of JFET. (It means that Q1 is the direct coupling between the input common-source connection and the output gate connection Q2). In order to avoid the occurrence of self-oscillation circuit, the capacitor (NEUT) is inducted. Capacitance value is tuned to ensure that oscillation would not occur in any frequency circuit of the band-pass. In general, the circuit can be adjusted to a single channel through L2/C1 and L3/C3.