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Cascade amplifier circuit

2015-01-28 01:28  
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Cascade amplifier circuit
Cascade amplifier is as shown in the figure. The amplifier uses two transistors (both JFET). Q1 is common source configuration and Q2 is a total gate configuration. These two tubes are direct-coupled with each other. The input and output is tuned by a pair of LC filter. (L2C1Ct and L3C2). To avoid the occurrence frequency oscillation in the circuit, a capacitor (C3) 9 is connected to LC filter between the input end of Q1 and the output end of Q2. figure: Cascade amplifier circuit