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CMOS Oscillator

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  • Nicolae Sfetcu
    (from ASCII circuits) CMOS Oscillator From: mjohnson@netcom.Netcom.COM (Mark Johnson) ... The circuit below uses a single CMOS lowspeed 74C14 inverting Schmitt
    Message 1 of 2 , Nov 1, 2001
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      (from ASCII circuits)

      CMOS Oscillator

      From: mjohnson@... (Mark Johnson)

      > 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

      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
      

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