Noise characteristics of current mirror sinks/sources

Author

Bilotti, Alberto ; Mariani, Eduardo

Volume

10

Issue

6

fYear

1975

fDate

12/1/1975 12:00:00 AM

Firstpage

516

Lastpage

524

Abstract

General expressions of the limiting and excess noise currents generated by a current mirror sink/source are derived. The analysis, restricted to low and audio frequencies, shows the effect of the transistor base resistance and the noise reduction due to the external emitter degeneration. By means of a computer-aided design (CAD) analysis, spectral density frequency plots are computed, and the total noise content in the audio band calculated for the case of a typical 1/f excess noise generator. The noise characteristics of other current source topologies are compared and shown to be quite similar to the basic current mirror. Noise measurements of current mirrors implemented with IC transistor pairs showed a good correlation with the previous analytical and CAD results.

Keywords

Bipolar transistors; Computer-aided circuit analysis; Linear integrated circuits; Monolithic integrated circuits; Noise; Semiconductor device models; bipolar transistors; computer-aided circuit analysis; linear integrated circuits; monolithic integrated circuits; noise; semiconductor device models; Design automation; Frequency; Genetic expression; Integrated circuit noise; Mirrors; Noise generators; Noise measurement; Noise reduction; Spectral analysis; Topology;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.1975.1050652

Filename

1050652