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research article
Common-mode Oscillation in Capacitive Coupled Differential Colpitts Oscillators
2007
A simple approach to the realisation of a differential Colpitts oscillator is to connect the grounded capacitor in the feedback network of two single-ended Colpitts oscillators together in series. As the output signals are expected to be differential, it is proved in this Letter that, this is not always the case. In certain circumstances, this topology exhibits a common-mode output signal, or even worse, a combination between differential-mode and common-mode waveforms. Design criteria for avoiding these undesirable oscillating behaviours are derived by considering the start-up characteristic of the oscillator.
Type
research article
Authors
Publication date
2007
Published in
Volume
43
Issue
21
Start page
1127
End page
1128
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
June 24, 2010
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