NDLI: A Bridge for Measuring Audio-Frequency Transistor Parameters

Content Provider	IEEE Xplore Digital Library
Author	Cooper, B.F.C.
Copyright Year	1931
Abstract	A bridge is described which measures the small-signal parameters of point contact and junction transistors at a frequency of 1 kc. The impedance parameters of point-contact transistors are measured for the grounded-base connection, while a set of parameters representing a compromise between the impedance parameters and the h parameters is measured for junction transistors operating in either the grounded-base or grounded-emitter connections. This set includes the short-circuit input impedance h11, the short circuit current amplification factor h2l, a paralleled resistance r22 and capacitance C22 representing the open-circuit output impedance, and two feedback resistances r12 and r12' which in the particular case of the grounded-base connection represent the "low-frequency" base resistance rb and the "high-frequency" base resistance rb' respectively. It is also shown that the ¿ cut-off frequency of junction transistors can be calculated with good accuracy from the bridge measurements.
Starting Page	796
Ending Page	805
Page Count	10
File Size	2987489
File Format	PDF
ISSN	00968390
Volume Number	43
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1955-07-01
Access Restriction	Subscribed
Rights Holder	The Institute of Radio Engineers, Inc. (IRE)
Subject Keyword	Bridge circuits Frequency measurement Impedance measurement Electrical resistance measurement Semiconductor device measurement Transistors Circuit testing Cutoff frequency Electronic equipment testing Admittance
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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