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- Path: 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
-
- 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
-