Accession Number : ADA082527


Title :   Nonlinear System Analysis in Bipolar Integrated Circuits.


Descriptive Note : Phase rept. Sep 77-Oct 79,


Corporate Author : SYRACUSE UNIV NY


Personal Author(s) : Fang,Ta-Fang ; Whalen,James J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a082527.pdf


Report Date : Jan 1980


Pagination or Media Count : 267


Abstract : Since analog bipolar integrated circuits (IC's) have become important components in modern communication systems, the study of the Radio Frequency Interference (RFI) effects in bipolar IC amplifiers is an important subject for electromagnetic compatibility (EMC) engineering. The investigation has focused on using the nonlinear circuit analysis program (NCAP) to predict RF demodulation effects in broadband bipolar IC amplifiers. The audio frequency (AF) voltage at the IC amplifier output terminal caused by an amplitude modulated (AM) RF signal at the IC amplifier input terminal was calculated and compared to measured values. Two broadband IC amplifiers were investigated: (1) a cascode circuit using a CA3026 dual differential pair; (2) a unity gain voltage follower circuit using a micro A741 operational amplifier (op amp). Before using NCAP for RFI analysis, the model parameters for each bipolar junction transistor (BJT) in the integrated circuit were determined. Probe measurement techniques, manufacturer's data, and other researcher's data were used to obtain the required NCAP BJT model parameter values. An important contribution included in this effort is a complete set of NCAP BJT model parameters for most of the transistor types used in linear IC's.


Descriptors :   *INTEGRATED CIRCUITS , *NONLINEAR SYSTEMS , *BIPOLAR SYSTEMS , *TRANSISTOR AMPLIFIERS , *OPERATIONAL AMPLIFIERS , RADIOFREQUENCY INTERFERENCE , ELECTROMAGNETIC COMPATIBILITY , CIRCUIT ANALYSIS , AMPLITUDE MODULATION


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE