Mira wrote:
Hi,
You have 3.3V power supply.
I don't think you may expect any output change if your
input is below 1.65V.
Try to change it to 2V or above and see if your output
voltage will change to 0V.
Mira
--- tastingfan tastingfan <[EMAIL PROTECTED]>
wrote:
Hi,
I want to simulate a CMOS-Inverter with Protel 2004.
I have two MOSFETs (MOSFET-P and MOSFET-N), one
power supply of 3.3V and one impulse generator which
gives out rectangular waves of 1 kHz. But the result
is wrong! The input has a range from 0V ¨C 1V,
that¡¯s OK. But the output only from 3.072 to
3.300V. Why is it not zero?
Best Regards
Tasting_fan
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I will go a step further and suggest that the input signal should be
3.3V. Not only do you need to turn on the bottom N-channel device, you
must also turn off the upper P-channel device. The signal must be closer
to the rail than the threshold voltage which is frequently quite low.
CMOS inverters are not normally used as voltage amplifiers but rather as
buffers (current gain) or to reverse the polarity of the signal.
I hope that helps.
Jim Walker
Walker Power Design, Inc.
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