DocumentCode
649144
Title
Source follower: A misunderstood humble circuit
Author
Filanovsky, I.M. ; Jarvenhaara, J. ; Tchamov, N.T.
Author_Institution
Univ. of Alberta, Edmonton, AB, Canada
fYear
2013
fDate
4-7 Aug. 2013
Firstpage
185
Lastpage
188
Abstract
The paper demonstrates that the source follower is the core of such seemingly disparate circuits as the wideband amplifier, crystal oscillator and emitter-coupled multivibrator. It is shown that the input impedance of the follower loaded by a capacitor has a negative real part. This part compensates partially or completely the resistive component of the signal source impedance. The compensation develops a strong overshoot in the step-signal transmission; in case of inductive component in the source impedance the circuit may operate as well as oscillator. The oscillators can be also obtained coupling two source followers; this may result in new oscillator circuits.
Keywords
amplifiers; capacitors; oscillators; capacitor; crystal oscillator circuits; emitter coupled multivibrator; humble circuit; input impedance; signal source impedance; source follower; step signal transmission; wideband amplifier; Analog Electronics; Santos Chrystal Oscillator; Source Follower; Source-Coupled Multivibrators; Wideband Amplifier;
fLanguage
English
Publisher
ieee
Conference_Titel
Circuits and Systems (MWSCAS), 2013 IEEE 56th International Midwest Symposium on
Conference_Location
Columbus, OH
ISSN
1548-3746
Type
conf
DOI
10.1109/MWSCAS.2013.6674616
Filename
6674616
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