From: Jim Thompson
Subject: Re: how to make a big range of schmitt trigger but not big size of transistor.
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Date: Mon, 16 Dec 2002 16:52:57 GMT
NNTP-Posting-Date: Mon, 16 Dec 2002 11:52:57 EST
Organization: Cox Communications
On 14 Dec 2002 23:18:32 -0800,
In Newsgroup: sci.electronics.design,
Entitled: "how to make a big range of schmitt trigger but not big size
Wrote the following:
|Hello thank you very mcuh.
|In my first VCO homework, there has a schmitt trigger.
|If I want that trigger has big range (VM+ , VM- have long distance)
|I have to increase the size of MOS width.
|but, it seems not too efficient (10X , 100X )
|dose there has any better way ?
Where did you come up with this structure?
A better approach is as follows:
Design an inverter with a threshold equal to the desired VH.
Design another inverter with a threshold equal to the desired VL.
Then create a circuit where feedback changes the sizes (series
If I can get a free moment I'll post an example to A.B.S.E within the
next 24 hours.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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