Study of Novel Small-Signal JFET Amplifiers in Sziklai pair Topology

In this paper, novel circuit designs of small-signal amplifiers with JFETs in Sziklai pair topology under common-source and source-follower modes are demonstrated for the first time. With low transconductance, proposed amplifiers produce highest current gain of 1735.90, moderate voltage gain of 3.99, widest bandwidth of 2.17 GHz, highest power gain of 37.53 dBWatt and lowest THD of 1.4S% and gives better results than previously announced JFETs small-signal amplifier in Darlington pair topology. Simulation results collaborated with theoretical analysis and proper reasoning justify our work. Analysis of the proposed amplifiers suggest their wide applicability in FET based constant current sources, Radio/TV receivers, High-pass filters, Low-pass filters, current amplifiers, voltage buffer amplifiers and impedance matching.