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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Description Price Oscillator Type Output Frequency Frequency Stability Load Capacitance Package Type Tuning Voltage Output Level Maximum Symmetry Mounting Type Minimum Operating Temperature Maximum Operating Temperature Pin Count Dimensions Height
RS Stock No. 442-864
Mfr. Part No.SN74LS624N
$5.31
Each
units
VCO 1.1 → 25 MHz - 45pF PDIP - Squarewave - - 0 °C +70 °C - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 145-1166
Mfr. Part No.SN74LS624N
$3.567
Each (In a Tube of 25)
units
VCO 1.1 → 25 MHz - 45pF PDIP - Squarewave - - 0 °C +70 °C - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 442-870
Mfr. Part No.SN74LS629N
$8.20
Each
units
VCO 1.1 → 25 MHz - 45pF PDIP - Squarewave - - 0 °C +70 °C - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 923-2473
Mfr. Part No.SN74LS629N
$6.637
Each (In a Tube of 25)
units
- - - - SOIC - - - - 0 °C +70 °C - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 163-0465
Mfr. Part No.MC100EL1648DG
$12.936
Each (In a Tube of 98)
units
VCO 1.1 GHz - 6pF SOIC - ECL - - -40 °C +85 °C - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 160-9957
Mfr. Part No.HMC385LP4E
$17.612
Each (On a Reel of 50)
units
- 2.25 → 2.5 GHz - - QFN - - - - -40 °C +85 °C - 4.1 x 4.1 x 1mm 1mm
RS Stock No. 806-2567
Mfr. Part No.MC100EL1648DG
$13.98
Each
units
VCO 1.1 GHz - 6pF SOIC - ECL - - -40 °C +85 °C - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 862-6089
Mfr. Part No.HMC385LP4E
$21.02
Each
units
VCO 2.25 → 2.5 GHz - - QFN - - - - -40 °C +85 °C - 4.1 x 4.1 x 1mm 1mm
RS Stock No. 662-4573
Mfr. Part No.SN74LS628NE4
$4.888
Each (In a Pack of 5)
units
VCO 1.1 → 25 MHz - 45pF PDIP - Squarewave - - 0 °C +70 °C - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 162-7068
Mfr. Part No.SN74LS628NE4
$4.573
Each (In a Tube of 25)
units
- 1.1 → 25 MHz - 45pF SOIC 0 → 5V Squarewave 50% Surface Mount 0 °C +70 °C 14 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 862-6417
Mfr. Part No.HMC586LC4B
$288.24
Each
units
VCO 4 → 8 GHz - - SMT - - - - -40 °C +85 °C - 4 x 4 x 1.2mm 1.2mm
RS Stock No. 160-2662
Mfr. Part No.HMC511LP5E
$51.729
Each (On a Reel of 50)
units
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
RS Stock No. 423-462
Mfr. Part No.LTC6908CS6-1#TRMPBF
$6.45
Each
units
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
RS Stock No. 917-3438
Mfr. Part No.LTC6908CS6-1#TRMPBF
$3.908
Each (On a Reel of 500)
units
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
RS Stock No. 160-2702
Mfr. Part No.HMC586LC4B
$338.692
Each (On a Reel of 50)
units
VCO 4 → 8 GHz - - SMT - - - - -40 °C +85 °C - 4 x 4 x 1.2mm 1.2mm
RS Stock No. 165-9525
Mfr. Part No.MAX2750EUA+
BrandMaxim
$6.93
Each (In a Tube of 50)
units
VCO 2400 → 2500 MHz - 220pF μMAX - - - - -40 °C +85 °C - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 131-1242
Mfr. Part No.HMC1163LP5E
$55.52
Each
units
VCO 9.65 → 10.41 GHz - - LFCSP - - - - -40 °C +85 °C - 5.1 x 5.1 x 0.95mm 0.95mm
RS Stock No. 862-6164
Mfr. Part No.HMC511LP5E
$48.41
Each
units
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
New
RS Stock No. 189-7193
Mfr. Part No.MAX2750EUA+
BrandMaxim
$7.96
Each (In a Tube of 50)
units
VCO 2400 → 2500 MHz - 220pF μMAX - - - - -40 °C +85 °C - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 862-6186
Mfr. Part No.HMC584LP5E
$48.41
Each
units
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
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