Article View: sci.electronics
Article #6700Re: CMOS Oscillator
From: Mark Johnson
Date: Tue, 18 Aug 1992 22:09
Date: Tue, 18 Aug 1992 22:09
44 lines
3035 bytes
3035 bytes
In article <1992Aug18.140051.10073@donau.et.tudelft.nl> elmar@dutentb.et.tudelft.nl (Elmar van Ginneken) writes:
> What I am looking for is a low power oscillator (<.5 mA @ 5V) running
> at a frequency of roughly 1 MHz.
> However, the frequency-determining component should be an inductor with
> a value of approx. 75 uH. (YES, I'm trying to measure inductance-change..)
The circuit below uses a single CMOS lowspeed 74C14 inverting Schmitt
trigger chip, your 75uH inductor, and two 10K resistors. It draws
about 400uA and oscillates at about 4MHz.
The oscillator period will be approximately linearly related to the
inductor value, Period ~=~ K1 + ( K2 * L ) . Note also that
K1 will not be zero.
------------> Output
|
|
|\ |\ |\ | |\
| \ | \ | \ | | \
| \ | \ | \ | | \
|------| >O----------| >O----------| >O----+-----| >O-----|
| | / | / | / | / |
| | / | / | / | / |
| |/ |/ |/ |/ |
| |
| +5.0V |
| | |
| \ |
| / R1 |
| /| \ 10K |
| / | / L1 |
| / | | 75 uH |
|------------------------O< |------------+---+----------)()()()(-------
\ | |
\ | /
\| \ R2
/ 10K
\
|
GND
--MJ
Technical Details
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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!decwrl!csus.edu!netcom.com!netcom!mjohnson From: mjohnson@netcom.Netcom.COM (Mark Johnson) Newsgroups: sci.electronics Subject: Re: CMOS Oscillator Message-ID: <MJOHNSON.92Aug18140900@netcom.Netcom.COM> Date: 18 Aug 92 22:09:00 GMT References: <1992Aug18.140051.10073@donau.et.tudelft.nl> Organization: Netcom Online Communications Service Lines: 44 In-Reply-To: elmar@dutentb.et.tudelft.nl's message of 18 Aug 92 14:00:51 GMT