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Converters: Voltage to Frequency, Page 1
Voltage Controlled Oscillators (VCO)
VCO; Voltage to Frequency Converters:  #'s - A     B - K     L - U    V - Z

Last Updated on:
Friday, March 23, 2012 04:29 PM

Circuits Designed by Dave Johnson, P.E. :
  • 40KHz Voltage to Frequency Converter
    This circuit was designed to frequency modulate a 40KHz carrier, using human voice frequencies.  A common flip/flop is used at the core of the circuit.
  • 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.
  • Air Transparency Monitor, Xenon Flash Receiver
    I designed this circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch fresnel lens at the transmitter end and a matching 12 inch lens with a PIN photo diode at the receiver. The receiver system was connected to a weather station and a computer to collect the changes in intensity of the light flashes under different weather conditions. It has the potential for a 30+ mile range. I have also used this system to conduct cloud bounce experiments.
  • Wide Band Zero Cross Detector
    This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal.  It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.  The input frequency can range from a few kilohertz to about 150KHz.

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

“Hippasian” nonlinear VFC stretches dynamic range -  19-Feb-09 Issue of EDN  A voltage-to-frequency converter uses square roots to extend dynamic range by orders of magnitude..... [Design Idea by W Stephen Woodward, Chapel Hill, NC]
0.02% V/F Converter Consumes Only 26 µA -  07/04/96 EDN-Design Ideas.....Figure 1  shows a voltage-to-frequency (V/F] converter that produces a 0- to 10-kHz output for an input range of 0 to 5V. Linearity of the converter is 0.02%, and gain drift is 60 ppm/8C. The maximum current consumption is only 26 �A, 100 times lower than currently available units. To understand the circuit's operation, assume..... [Design Idea by Jim Williams, Linear Technology, Milpitas, CA]
10 Khz VFC uses Charge Pump Variation -  04/09/98 EDN-Design Ideas.....A diode-capacitor charge pump is the starting point for many voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1 uses a variation on that classic theme to achieve linearity less than 0.05%, micropower operation of.....several circuits included, scroll the find this one..... [Design Idea by Stephen Woodward, University of North Carolina, Chapel Hill, NC]
10.58 to 10.74 MHz VFO Oscillator  -  Electronic Circuit design (added 02/05)
1-Hz to 100-MHz VFC features 160-dB dynamic range -  1-Sep-05 Issue of EDN  Transform voltage to current over wide frequency, amplitude..... [Design Idea by Jim Williams, Linear Technology Corp; Edited by Brad Thompson and Fran Granville]
200mhz-400mhz Voltage Controlled Oscillator (VCO) -  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..... [Designed by David A. Johnson]
2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with COP8 MicroControllers -  National Semiconductor Application Note.....[App Note]
40kHz Voltage to Frequency Converter -  This circuit was designed to frequency modulate a 40KHz carrier, using human voice frequencies.  A common flip/flop is used at the core of the circuit. …. [Designed by David A. Johnson]
Air Transparency Monitor, pg 1 -  I designed this circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch fresnel lens at the transmitter end and a matching 12 inch lens with a PIN photo diode at the receiver. The receiver system was connected to a weather station and a computer to collect the changes in intensity of the light flashes under different weather conditions. It has the potential for a 30+ mile range. I have also used this system to conduct cloud bounce experiments..... [Designed by David A. Johnson]
Air Transparency Monitor, pg 2 -  This is Page 2 of the air transparency monitor receiver circuit..... [Designed by David A. Johnson]
AN-214: Ground Rules for High Speed Circuits -  AN-214 Analog Devices Application Notes.....[App Note]Layout and Wiring Are Critical in Video Converter Circuits.
AN-276: Analog-to-Digital Conversion by using V/F Converters -  AN-276 Analog Devices Application Notes  (app note added 2/06)
AN-277: Applications for the AD537 Voltage to Frequency Converter -  AN-277 Analog Devices Application Notes  (app note added 2/06)
AN-278: Operation & Applications of the AD654 IC V-to-F Converter -  AN-278 Analog Devices Application Notes  (app note added 2/06)
AN-279: Using the AD650 Voltage-to-Frequency Converter as a Frequency-to-Voltage Converter -  AN-279 Analog Devices Application Notes  (app note added 2/06)
AN-280: Mixed Signal Circuit Technologies -  AN-280 Analog Devices Application Notes.....[App Note]Considers problems which arise when reality (& Murphy)  intervene in a design which orwise seems satisfactory in terms of ory and modeling.
AN-343: Circuit Ideas for IC Converters -  AN-343 Analog Devices Application Notes  (app note added 2/06)
AN-349: Keys to Longer Life for CMOS -  AN-349 Analog Devices Application Notes  (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
AN-361: Ask the Applications Engineer V/F Converters -  AN-361 Analog Devices Application Notes  (app note added 2/06)
AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices Application Notes  (app note added 2/06)
AN795: Voltage-To-Frequency/Frequency-To-Voltage Converter -  Microchip Application Note Published 12-Nov-02  (app note added 2/06)
AN967: Bidirectional VF Control of Single & 3-Phase Induction Motors using the PIC16F72 -  Microchip Application Note Published 27-Jan-05.....[App Note]
Analog-to-Digital Conversion by using V/F Converters -  AN-276 Analog Devices Application Notes  (app note added 2/06)
AN-C: V/F Converter ICs Handle Frequency-To-Voltage Needs -  National Semiconductor Application Note  (app note added 2/06)
AN-D: Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy -  National Semiconductor Application Note  (app note added 2/06)
Applications for the AD537 Voltage to Frequency Converter -  AN-277 Analog Devices Application Notes  (app note added 2/06)
Ask the Applications Engineer V/F Converters -  AN-361 Analog Devices Application Notes  (app note added 2/06)


VCO; Voltage to Frequency Converters:  #'s - A     B - K     L - U    V - Z

 
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