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

Last Updated on:
Thursday, April 07, 2016 01:01 PM

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Circuits Designed by Dave Johnson, P.E. :
  • 1us LED Pulse Driver + Voltage to Frequency Converter -  This circuit receives the signal from the above Amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/22/99]
     

  • 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 . . . [Circuit by David Johnson P.E.,  03/19/99]

  • 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 . . . [Circuit by David A. Johnson P.E.,  12/12/04]

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

0.01% Voltage to Frequency Converter -  The LTC6943 is a monolithic, charge-balanced, dual switched capacitor instrumentation building block. A pair of switches alternately connects an external capacitor to an input voltage and then connects the charged capacitor across an output port. The internal switches have a break-before-make action. An internal clock is provided. . .  [Linear Technology App Note - , Mar 31, 2010]

 

0.02% V/F Converter Consumes Only 26 A -  07/04/96 EDN Design Idea   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. . . .  [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

10 Khz VFC uses Charge Pump Variation -  04/09/98 EDN Design Idea   (Several circuits included, scroll to find this one)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 ach. . .  [by Stephen Woodward, University of North Carolina, Chapel Hill, NC]

 

10.58 to 10.74 MHz VFO Oscillator  -  Figure 1, below, shows the 10. 58 to 10. 74 MHz VFO oscillator circuit. Yes, this is the same circuit that was presented last time, but Ive re-drawn it to show the Colpitts oscillator more clearly. "L" is approximately 1. 5 uH; 19 turns in a T50-6 core (yellow). The value of C6 is found experimentally. I used 69 pF (a 47 pF and a 22 pF in parallel). More about this during check-out. . . .  [Dick Kelly]

1-Hz to 100-MHz VFC features 160-dB dynamic range -  09/01/05  EDN Design Idea   Transform voltage to current over wide frequency, Amplitude. The VFC (voltage-to-frequency-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency100 MHz with 10% overrange to 110 MHzby a factor of 10 over any commercially available converter. The circuit's 160-dB dynamic range spans eight decades for a 0 to 5V input range and allows continuous operation down to 1 Hz. Additional specifications include 0. 1% linearity, a 250-ppm/C gain/temperature coefficient, a 1-Hz/C zero-point shift, and a 0. 1% frequency shift for a 10% power-supply- voltage variation. A single 5V supply powers the circuit. . . .  [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

 

1us LED Pulse Driver + Voltage to Frequency Converter -  This circuit receives the signal from the above Amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/22/99]

 

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 . . . [Circuit by David Johnson P.E.,  03/19/99]

 

2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with COP8 MicroControllers -  Application Note. . .  [National Semiconductor]

 

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 . . . [Circuit by David A. Johnson P.E.,  12/12/04]

 

AN-276: Analog-to-Digital Conversion by using V/F Converters -  AN-276 Analog Devices App Note - . . . 

 

AN-277: Applications for the AD537 Voltage to Frequency Converter -  AN-277 Analog Devices App Note - . . . 

 

AN-278: Operation & Applications of the AD654 IC V-to-F Converter -  AN-278 Analog Devices App Note - . . . 

 

AN-279: Using the AD650 Voltage-to-Frequency Converter as a Frequency-to-Voltage Converter -  AN-279 Analog Devices App Note - . . . 

 

AN-280: Mixed Signal Circuit Technologies -  AN-280 Analog Devices 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 App Note - . . . 

 

AN-361: Ask the Applications Engineer V/F Converters -  AN-361 Analog Devices App Note - . . . 

 

AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices App Note - . . . 

 

AN795: Voltage-To-Frequency/Frequency-To-Voltage Converter -  Application Note Published 12-Nov-02. . .  [Microchip]

 

AN967: Bidirectional VF Control of Single & 3-Phase Induction Motors using the PIC16F72 -  Application Note Published 27-Jan-05. . .  [Microchip]

 

Analog-to-Digital Conversion by using V/F Converters -  AN-276 Analog Devices App Note - . . . 

 

AN-C: V/F Converter ICs Handle Frequency-To-Voltage Needs -  Application Note. . .  [National Semiconductor]

 

AN-D: Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy -  Application Note. . .  [National Semiconductor]

 

Applications for the AD537 Voltage to Frequency Converter -  AN-277 Analog Devices App Note - . . . 

 

Ask the Applications Engineer V/F Converters -   . . .  [AN-3614 App Note - by James Bryant]

 

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

Last Updated on:
Thursday, April 07, 2016 01:01 PM


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