Sziklai-kobling

Indenfor elektronik er en Sziklai-kobling (også kendt som en "complementary feedback pair" forkortet CFP) er en sammensætning af to bipolare transistorer, der minder om Darlington-koblingen.^[1] Koblingen er navngivet efter dens tidlige populariserer George C. Sziklai.

I modsætning til Darlington-koblingen har Sziklai-koblingen én NPN og én PNP transistor - og Sziklai-koblingen kaldes nogle gange også en "komplementær Darlington". Strømforstærkningen svarer stort set til Darlington-koblingens, som ca. er produktet af strømforstærkningerne af de to transistorer.

Sziklai-koblingen har typisk mere end 20dB (10 gange) lavere harmonisk forvrængning end Darlington-koblingen. Herudover er effektudgangstrin baseret på Sziklai-koblingen betydeligt mere termisk stabile end Darlington-koblingen.^[2]

Se også

Darlington-transistor

Kilder/referencer

^ Horowitz, Paul; Winfield Hill (1989). The Art of Electronics. Cambridge University Press. ISBN 0-521-37095-7.
^ Rod Elliott: Compound Pair Vs. Darlington Pair Arkiveret 1. juli 2015 hos Wayback Machine Citat: "...Quite obviously, the compound pair [Sziklai-kobling] (green trace) has fewer harmonics above the -120dB noise floor, and they are all at a lower level - by 20dB or more!...The temperature dependence of the two circuits in Figure 5 is shown in Table 1. Because it is much easier to keep the driver transistors at a consistent temperature, it is apparent that it will be far easier to maintain a stable bias current using the compound pair [Sziklai-kobling] than can ever be the case with a Darlington pair..."

Eksterne henvisninger

U.S. Patent 2.762.870 Push-pull complementary type transistor amplifier. G.C.Sziklai, September 11, 1956
U.S. Patent 2.791.644 Push-pull amplifier with complementary type transistors. G.C.Sziklai, May 7, 1957
ECE 327: Procedures for Output Filtering Lab — Section 4 ("Power Amplifier") discusses design of a BJT-Sziklai-pair-based class-AB current driver in detail.

[TAoE-1] Horowitz, Paul; Winfield Hill (1989). The Art of Electronics. Cambridge University Press. ISBN 0-521-37095-7.

[2] Rod Elliott: Compound Pair Vs. Darlington Pair Arkiveret 1. juli 2015 hos Wayback Machine Citat: "...Quite obviously, the compound pair [Sziklai-kobling] (green trace) has fewer harmonics above the -120dB noise floor, and they are all at a lower level - by 20dB or more!...The temperature dependence of the two circuits in Figure 5 is shown in Table 1. Because it is much easier to keep the driver transistors at a consistent temperature, it is apparent that it will be far easier to maintain a stable bias current using the compound pair [Sziklai-kobling] than can ever be the case with a Darlington pair..."

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