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Square Wave Oscillator Circuits
Designed by David A. Johnson, P.E.

Last Updated on:
Tuesday, October 13, 2009 01:26 PM

Master Category List - Dave's Circuits

 

Dave's Circuits:  Astable Oscillator Circuits             Audio Oscillator Circuits             Crystal Oscillators               RF (Radio Frequency) Oscillators        
Sine Wave Oscillators              Square Wave Oscillators        
Triangle Wave Oscillators          Voltage Controlled Oscillators (VCO)   
 

Dave's SquareWave Oscillator Circuits:  Page 1,   Page 2
  • 200MHz400MHz VOLTAGE CONTROLLED OSCILLATOR
    If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage-controlled capacitors to change the frequency.
  • CMOS INVERTER 125KHz LC OSCILLATOR
    This circuit uses a single CMOS inverter to form a series resonant LD oscillator.   The values shown set the oscillation at about 125KHz but other frequencies are possible by changing the main LC values.
  • CMOS INVERTER PARALLEL LC OSCILLATOR
    I have used this parallel resonant LC oscillator circuit countless times.  The oscillator frequency is determined by the inductor and capacitor values.  I have shown an adjustable inductor to make it easy to set the frequency to a specific value.  Once set the frequency is fairly stable over supply voltage variations and temperature changes.  The values shown are for 125KHz but the frequency can range from tens of kilohertz to tens of megahertz.   With a 74HCU04 type inverter, it will oscillate down to about 1.5 volts.  If the frequency is low, you can also use a 74C04 (CD4069) inverter.
  • CMOS SCHMITT TRIGGER IC MAKES VCO
    By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1.  A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal.
Dave's SquareWave Oscillator Circuits:  Page 1,   Page 2


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