Small Signal Amplifier with P-Type Sziklai Pair

Abstract

Significant modification is done in PNP Sziklai pair based small signal amplifier by modeling of paired device and deletion of a prominent biasing resistor from the circuit. This culminates into two discrete amplifier designs, proposed for the present studies. Both the proposed amplifiers simultaneously produce high voltage and current gain. However, bandwidth of one of the proposed amplifiers is found wider (195.603KHz) with higher THD whereas it is narrower (2.747KHz) for the other amplifier with lower THD. Qualitative behavior of proposed amplifiers is also analyzed on various scales like temperature dependency, noise dependency, impact of various biasing parameters on amplifier performance etc. The proposed amplifiers are found suitable to use in that kind of receiver/transmitter circuits where the band requirement limits between 2KHz to 195KHz.