Circuit - RF (Radio Frequency) Oscillators Circuits / Schematic List - Circuits designed by David A. Johnson, P.E.


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RF (Radio Frequency) Oscillators Oscillator Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, August 29, 2008 02:34 PM

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More Oscillator
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)

200MHz - 400MHz 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 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 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 buth other frequencies are possible by changing the main LC values.

CMOS INVERTERS FORM 125KHZ OSCILLATOR
This circuit is similar to CMOS INVERTER 125KHz LC OSCILLATOR but inverts the LC components so the inductor is grounded. Two inverters are needed to produce the needed oscillation. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies.

CMOS NAND GATE FORMS GATED 125KHZ OSCILLATOR
This circuit is similar to CMOS INVERTER 125KHz LC OSCILLATOR but uses a NAND gate as an inverter. The gate allows the oscillator to be gated on and off. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies.

MEDIUM POWER 125KHZ OSCILLATOR
This circuit is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR but adds more invertors in parallel to deliver more power. The values shown are for 125KHz.

MEDIUM POWER 125KHZ OSCILLATOR
This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz.

More Oscillator Circuits
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