A Novel Cascode Differential Amplifier

The Differential Cross-Connected Cascode - a novel cascode circuit - is proposed and
investigated. Its fundamental distinction from the Differential Ordinary Cascode consists in the input signal voltage being applied simultaneously to the inputs of common emitter/source and common base/gate stages, and besides the inputs of CE/CS and CB/CG being cross-coupled. We show that the input signal is amplified in the input circuit, furthermore the input impedance and the current gain increase considerably and the bandwidth is essentially expanded. Simulation results of such a cascode designed with IBM BJT transistors are presented. The predicted and actually obtained bandwidths roved to be more than twice as wide as compared with the usual cascode: 8.6 - 18.7 GHz.

By: Y. Bruck, G. Burdo, M. Zelikson, L. Boreysha

Published in: H-0217 in 2004


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