LETTER
Wide-range high-linearity current-controlled pulse-width/delay circuits
Keywords:
PWM circuit,
delay circuit
2005 Volume 2 Issue 7 Pages 217-220
Details
2005 Volume 2 Issue 7 Pages 217-220
A wide-range high-linearity current-controlled pulse-width/ delay circuit suitable for current-mode controlled techniques is presented in this paper. The proposed circuit has been fabricated with 0.35µm CMOS 2P4M processes. The chip area is only 0.33mm × 0.12mm. The experimental results show the variation of the output frequency within ±0.2%, the tolerance of duty cycle is less than 0.2%. The current-controlled pulse-width/delay circuit is supply independent and can be operated at 2.5V. The linear range of input current is from 4µA to 277µA, and corresponding duty cycle of pulse-width output is from 1.59% to 97.2%. The experimental results agreed with the theoretical analysis are presented in this paper.
