Oscillators - RF Electronic Circuits


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Oscillators: RF (Radio Frequency)
Last Updated on: Wednesday April 30, 2008 12:16:12 PM

Oscillator Circuits -- Main Page

Circuits Designed by Dave Johnson, P.E. :

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 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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Basic RF Oscillator #1: (electronic (schematic / circuit added 4/02)

Generating Phase Controlled Sinewaves with the ML2036 / AN-42000: Fairchild Application Notes / (app note added 6/06)

Measurement results for RF oscillator for 1000 - 1500 MHz: (design added 11/06)

OpAmp Oscillators Simplify RF Designs: 10/10/96 EDN-Design Ideas / (added 3/03)

RF divider by 10/11 with SP8695: (diagram added 11/06)

RF Oscillator uses Current feedback op amp: 10/03/02 EDN Design Ideas / (added 1/05) A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower—in practice, a symmetrical emitter follower (Figure 1). The configuration samples the output current, converts it to voltage across a large impedance, and amplifies it to the output using a high-power, low-output-impedance amplifier....

RF Test Generator ( 0,5 MHz to 110 MHz): (electronic design added 11/06)