Title :
Noise characteristics of current mirror sinks/sources
Author :
Bilotti, Alberto ; Mariani, Eduardo
fDate :
12/1/1975 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1975.1050652
