PM and AM noise in nonlinear BJT amplifier

Author

Kuleshov, V.N.

Author_Institution

Power Eng. Inst., Moscow, Russia

Volume

2

fYear

1999

fDate

1999

Firstpage

1180

Abstract

An approach to nonlinear BJT amplifier PM and AM noise calculation is presented. Polyharmonic presentation of voltages and currents is used and periodical nonstationarity of BJT noise sources due to their modulation by periodic signal is taken into consideration. Due to these effects one has to introduce different “noise factors” for PM and AM noise calculation (if one expands the formulae obtained for linear mode of operation to nonlinear one), and these noise factors depend on the input signal level. Common emitter (CE) amplifier with both bypassed and unbypassed resistors in emitter circuit is considered in detail. Power spectral densities of AM and PM noise are calculated as functions of signal amplitude. An influence of bypassed and unbypassed emitter resistor on PM and AM noise is investigated

Keywords

amplifiers; bipolar transistor circuits; circuit noise; nonlinear network analysis; AM noise; BJT noise sources; PM noise; bypassed resistors; input signal level; nonlinear BJT amplifier; periodical nonstationarity; polyharmonic presentation; power spectral densities; unbypassed resistors; Broadband amplifiers; Circuit noise; Feedback circuits; Impedance; Low-frequency noise; Noise level; Power amplifiers; Resistors; Voltage; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European

Conference_Location

Besancon

ISSN

1075-6787

Print_ISBN

0-7803-5400-1

Type

conf

DOI

10.1109/FREQ.1999.841551

Filename

841551