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New small-signal amplifying system with Sziklai pairs in triple-transistor topology

Authors: SachchidaNand Shukla;

New small-signal amplifying system with Sziklai pairs in triple-transistor topology

Abstract

A new small-signal amplifying system with Sziklai pairs in triple transistor topology is proposed and qualitatively analyzed for the first time. Proposed amplifier design may be used at preamplifier stage of EEG, Radio/TV receivers and other audible frequency range communication systems. Combination of Q1-Q2 transistors in the proposed design constitutes PNP Sziklai pair whereas Q2-Q3 together acts as NPN Sziklai pair. Circuit successfully amplifies audio range signals swinging in 1μV-10mV range. It produces high voltage gain (190.95), current gain greater than unity (7.208), 250.83 KHz bandwidth, low harmonic distortion (0.817%) and can be tuned in 41Hz-250KHz frequency range. Resistance RA in the design is essential to maintain its voltage/current amplification property whereas REX can be optionally used. Proposed circuit is free from the poor response problem of small-signal Darlington pair amplifiers at higher frequencies and narrow bandwidth restrictions of recently announced PNP and NPN driven small-signal Sziklai pair amplifiers. Tuning performance, variation of voltage gain with frequency and different biasing resistances, small-signal AC analysis, harmonic distortion, temperature dependency of performance parameters and input/output noises of the circuit are widely discussed.

Subjects by Vocabulary

Microsoft Academic Graph classification: Engineering Total harmonic distortion business.industry Amplifier Transistor Electrical engineering Biasing Topology law.invention Darlington transistor law Sziklai pair Equivalent circuit business Audio frequency

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    1
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average