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[Move]: 0.4 V supply voltage cmos circuit to control the duty cycle of square wave...

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Debasish_Halder

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Friends I need a 0.4 V supply voltage cmos circuit to control the duty cycle of square wave...
I have a perfect square of 50% duty cycle with 0.4 V amplitude 150Hz frequency.I want to control the duty cycle from 0-50% by keeping the frequency same....kindly tell me how can I do that...
 

erikl

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Why would you need a 0.4V supply voltage to change the duty cycle of a 0.4V square wave? Could you explain?
 

BradtheRad

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I was ready to suggest a capacitor-resistor-diode arrangement, to modify the waveforms.

However a diode does not act below 0.4 V. This appears to be an exercise in thinking up ways to do the job without using a diode.
 

Debasish_Halder

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Why would you need a 0.4V supply voltage to change the duty cycle of a 0.4V square wave? Could you explain?

Sir it could be used in brain pacemakers which could be used in DBS...

- - - Updated - - -

Friends, can I use PWM for this purpose??? kindly suggest me some voltage controlled PWM which could work at 0.4 V supply voltage.......
 

BradtheRad

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There are low-barrier diodes (shottky, germanium) which may operate below 0.4 V.

If you bias a JFET to just the right degree, you may get it to modify your waveform.
 

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