VCO Oscillators

VCO (Voltage Controlled Oscillators) can also be known as silicon oscillators or VCOs. They are electronic devices designed to control oscillation frequency by varying the DC voltage input. Oscillation frequencies can be adjusted from a few Hz to hundreds of GHz. The VCO's can also work as modulators of both frequency and phase by delivering a modulating signal to the control input. Voltage Controlled Oscillators are also commonly used as an integral part of the phase-locked loop.


What are the types of VCO Oscillators?


Voltage Controlled Oscillators can be categorized into 2 types according to the type of waveform generated:


Linear / Harmonic Oscillator - this type of oscillator generates a sinusoidal type of waveform.


Relaxation Oscillator - This type of VCO is able to generate a triangular waveform or a sawtooth waveform.


What are the voltage controlled oscillators used for?


There are several typical applications of VCOs and they are:


  • Function Generators

  • Phase-Locked Loops

  • Tone Generators

  • Clock Generators

  • Electronic Jamming Equipment

  • Frequency Synthesizers

How to choose the right VCO?


  • Some key parameters that need to be considered before selecting the VCO are:

  • The Frequency Range - the minimum and maximum tunable oscillation frequency (MHz)

  • Output Power - The output power produced by the VCO (dbm)

  • Tuning Voltage - the voltage level applied to the device to tune and set the desired oscillation frequency (V)

  • Tunning Sensitivity - the level of variation of the oscillation frequency with different voltages applied to the VCO (MHz/V)

  • Supply Voltage - a DC Voltage required to correct operation (V)

  • Pulling - drift in the output frequency due to load variation (MHz/V)

  • Pushing - drift in the output frequency due to variation in the supply voltage (MHz/V)

  • Phase Noise - a clarity of the output signal from the VCO (dBc/Hz)
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Produkta apraksts Brand Stock Oscillator Type Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Dimensions Height Minimum Operating Supply Voltage Maximum Operating Supply Voltage Series
Texas Instruments 1.1 → 25 MHz VCO Oscillator, 14-Pin PDIP SN74LS628NE4 Texas Instruments 125 VCO 1.1 → 25 MHz - 45pF PDIP Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 4.75 V 5.25 V -
Linear Technology 50 kHz → 10 MHz VCO Oscillator 300ppm/√kh, 6-Pin TSOT-23 LTC6908CS6-1#TRMPBF Linear Technology 106 VCO 50 kHz → 10 MHz 300ppm/√kh 5pF TSOT-23 CMOS -40 °C +85 °C 2.9 x 1.5 x 0.9mm 0.9mm 2.25 V 5.5 V -
Maxim 2400 → 2500 MHz VCO Oscillator, 8-Pin μMAX MAX2750EUA+
  • RS noliktavas numurs 799-2811
  • Zīmols Maxim
  • Ražotāja numurs MAX2750EUA+
Maxim 97 VCO 2400 → 2500 MHz - 220pF μMAX - -40 °C +85 °C 3.1 x 3.1 x 0.95mm 0.95mm 2.7 V 5.5 V -
ON Semiconductor 1.1 GHz VCO Oscillator, 8-Pin SOIC MC100EL1648DG ON Semiconductor 94 VCO 1.1 GHz - 6pF SOIC ECL -40 °C +85 °C 5 x 4 x 1.5mm 1.5mm 4.2 V 5.5 V -
Texas Instruments 1.1 → 25 MHz VCO Oscillator, 16-Pin PDIP SN74LS629N Texas Instruments 33 VCO 1.1 → 25 MHz - 45pF PDIP Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 4.75 V 5.25 V -
Analog Devices 4.225 → 4.775 (Output 2) GHz, 8.45 → 9.55 (Output 1) GHz VCO Oscillator, 32-Pin QFN Analog Devices 27 VCO 4.225 → 4.775 (Output 2) GHz, 8.45 → 9.55 (Output 1) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Analog Devices 3.325 → 3.825 (Output 2) GHz, 6.65 → 7.65 (Output 1) GHz VCO Oscillator, 32-Pin QFN Analog Devices 24 VCO 3.325 → 3.825 (Output 2) GHz, 6.65 → 7.65 (Output 1) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Analog Devices 12.5 → 13.9 (Output 1) GHz, 6.25 → 6.95 (Output 2) GHz VCO Oscillator, 32-Pin QFN Analog Devices 23 VCO 12.5 → 13.9 (Output 1) GHz, 6.25 → 6.95 (Output 2) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Texas Instruments 1.1 → 25 MHz VCO Oscillator, 14-Pin PDIP SN74LS624N Texas Instruments 22 VCO 1.1 → 25 MHz - 45pF PDIP Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 4.75 V 5.25 V -
Analog Devices 2.25 → 2.5 GHz VCO Oscillator, 24-Pin QFN HMC385LP4E Analog Devices 14 VCO 2.25 → 2.5 GHz - - QFN - -40 °C +85 °C 4.1 x 4.1 x 1mm 1mm 2.75 V 3.25 V Hittite
Analog Devices 9.65 → 10.41 GHz VCO Oscillator, 32-Pin LFCSP HMC1163LP5E Analog Devices 11 VCO 9.65 → 10.41 GHz - - LFCSP - -40 °C +85 °C 5.1 x 5.1 x 0.95mm 0.95mm - 5.5 V HMC1163
IQD 20 MHz TCXO Oscillator, HCMOS ±0.9ppm 7x5mm SMDLFTVXO009907
  • RS noliktavas numurs 478-9050
  • Zīmols IQD
  • Ražotāja numurs LFTVXO009907
IQD 11 TCXO 20 MHz ±0.9ppm 15pF 7x5mm SMD HCMOS -20 °C +70 °C 7 x 5 x 2mm 2mm - - -
Analog Devices 4.525 → 5.075 (Output 2) GHz, 9.05 → 10.15 (Output 1) GHz VCO Oscillator, 32-Pin QFN Analog Devices 8 VCO 4.525 → 5.075 (Output 2) GHz, 9.05 → 10.15 (Output 1) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Analog Devices 10 → 20 GHz VCO Oscillator, 24-Pin SMT HMC733LC4B Analog Devices 5 VCO 10 → 20 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm - 5.5 V Hittite
Analog Devices 3.9 → 4.4 (Output 2) GHz, 7.8 → 8.8 (Output 1) GHz VCO Oscillator, 32-Pin QFN HMC509LP5E Analog Devices 5 VCO 3.9 → 4.4 (Output 2) GHz, 7.8 → 8.8 (Output 1) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Analog Devices 6 → 12 GHz VCO Oscillator, 24-Pin SMT HMC732LC4B Analog Devices 5 VCO 6 → 12 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm - 5.5 V Hittite
Analog Devices 10 → 20 GHz VCO Oscillator, 24-Pin SMT HMC733LC4B Analog Devices 0 VCO 10 → 20 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm - 5.5 V Hittite
Analog Devices 12.5 → 13.9 (Output 1) GHz, 6.25 → 6.95 (Output 2) GHz VCO Oscillator, 32-Pin QFN Analog Devices 0 VCO 12.5 → 13.9 (Output 1) GHz, 6.25 → 6.95 (Output 2) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
Analog Devices 2.25 → 2.5 GHz VCO, 24-Pin QFN HMC385LP4E Analog Devices 0 - 2.25 → 2.5 GHz - - QFN - -40 °C +85 °C 4.1 x 4.1 x 1mm 1mm 2.75 V 3.25 V Hittite
Analog Devices 3.9 → 4.4 (Output 2) GHz, 7.8 → 8.8 (Output 1) GHz VCO, 32-Pin QFN HMC509LP5E Analog Devices 0 - 3.9 → 4.4 (Output 2) GHz, 7.8 → 8.8 (Output 1) GHz - - QFN - -40 °C +85 °C 5.1 x 5.1 x 1mm 1mm 4.75 V 5.25 V Hittite
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