Abstract— A New circuit model of two-stage small-signal
amplifier using Darlington and Sziklai pairs is proposed for the
first time. Proposed circuit is obtained by cascading a smallsignal Darlington pair amplifier with that of Sziklai pair based
small-signal amplifier with minor modifications. Proposed
amplifier essentially uses two additional biasing resistances in its
design. It crops considerably high voltage and current gain
(345.523 and 464.357 respectively) with audible range bandwidth
of 43.363 KHz for AC input signals swinging in 10-30mV range
at 1KHz or lower frequency. Proposed circuit-architecture
successfully removes the poor response problem of conventional
Darlington pair amplifiers at higher frequencies and narrow
bandwidth problem of recently announced (by authors) circuits
of small-signal Sziklai pair amplifier. Variations in voltage gain
with frequency and various biasing components like biasing
resistances, DC supply voltage and coupling capacitors are
discussed in length. Temperature sensitivity of performance
parameters, THD and small-signal AC equivalent circuit analysis
of the proposed circuit are elaborately studied. Proposed design
can be implemented in cascadable gain blocks for receivers,
715Hz-44KHz frequency range power sources and in the circuits
where reproduction of signal with simultaneously high voltage
and current gain is the prime requirement