科研之友
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摘要
This paper proposes the application of an electronically controlled current-mode for a level shifted multi-carrier PWM generator. The proposed circuit consists of two multiple-output current follower transconductance amplifiers (MO-CFTAs) for the multiple-output triangular generator and four current follower transconductance amplifiers (CFTAs) for the signal comparator. The characteristics of the circuit are as follows: the current output can be controlled by bias current, the maximum amplitude deviation due to temperature variation is less than 1.37 % and the power consumption is approximately 0.744 mu W, at +/- 1.5 V supply voltages. The proposed PWM has been verified through PSpice simulation results which are in consistent with the theoretical analysis.
- 出版日期2013-9
