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 Output Level Minimum Operating Temperature Maximum Operating Temperature Dimensions Height Maximum Operating Supply Voltage Minimum Operating Supply Voltage Series
RS Stock No. 145-1166
Mfr. Part No.SN74LS624N
PHP119.162
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 5.25 V 4.75 V -
RS Stock No. 163-0465
Mfr. Part No.MC100EL1648DG
PHP425.459
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 5.5 V 4.2 V -
RS Stock No. 806-2567
Mfr. Part No.MC100EL1648DG
PHP421.60
Each
units
VCO 1.1 GHz - 6pF SOIC ECL -40 °C +85 °C 5 x 4 x 1.5mm 1.5mm 5.5 V 4.2 V -
RS Stock No. 442-864
Mfr. Part No.SN74LS624N
PHP154.90
Each
units
VCO 1.1 → 25 MHz - 45pF PDIP Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 5.25 V 4.75 V -
RS Stock No. 905-5857
Mfr. Part No.CVCO55BE-0510-0770
BrandCrystek
PHP1,146.09
Each
units
VCO 770 MHz - - SMD VCO -40 °C +85 °C 12.7 x 12.7 x 3.81mm 3.81mm 9.45 V dc 8.55 V dc -
RS Stock No. 165-9525
Mfr. Part No.MAX2750EUA+
BrandMaxim
PHP275.63
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 5.5 V 2.7 V -
RS Stock No. 799-2811
Mfr. Part No.MAX2750EUA+
BrandMaxim
PHP351.26
Each
units
VCO 2400 → 2500 MHz - 220pF μMAX - -40 °C +85 °C 3.1 x 3.1 x 0.95mm 0.95mm 5.5 V 2.7 V -
RS Stock No. 923-2473
Mfr. Part No.SN74LS629N
PHP222.562
Each (In a Tube of 25)
units
- - - - SOIC - 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 5.25 V 4.75 V -
RS Stock No. 442-870
Mfr. Part No.SN74LS629N
PHP237.89
Each
units
VCO 1.1 → 25 MHz - 45pF PDIP Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 5.25 V 4.75 V -
RS Stock No. 862-6155
Mfr. Part No.HMC507LP5E
PHP1,649.93
Each
units
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 5.25 V 4.75 V Hittite
RS Stock No. 862-6433
Mfr. Part No.HMC732LC4B
PHP10,126.70
Each
units
VCO 6 → 12 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm 5.5 V - Hittite
RS Stock No. 160-9957
Mfr. Part No.HMC385LP4E
PHP586.486
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 3.25 V 2.75 V Hittite
RS Stock No. 160-2702
Mfr. Part No.HMC586LC4B
PHP11,278.129
Each (On a Reel of 50)
units
VCO 4 → 8 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm 5.5 V - Hittite
RS Stock No. 160-2659
Mfr. Part No.HMC509LP5E
PHP1,648.50
Each (On a Reel of 50)
units
- 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 5.25 V 4.75 V Hittite
RS Stock No. 662-4573
Mfr. Part No.SN74LS628NE4
PHP191.334
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 5.25 V 4.75 V -
RS Stock No. 862-6164
Mfr. Part No.HMC511LP5E
PHP1,649.93
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 5.25 V 4.75 V Hittite
RS Stock No. 160-2704
Mfr. Part No.HMC732LC4B
PHP7,539.143
Each (On a Reel of 50)
units
VCO 6 → 12 GHz - - SMT - -40 °C +85 °C 4 x 4 x 1.2mm 1.2mm 5.5 V - Hittite
RS Stock No. 862-6089
Mfr. Part No.HMC385LP4E
PHP724.51
Each
units
VCO 2.25 → 2.5 GHz - - QFN - -40 °C +85 °C 4.1 x 4.1 x 1mm 1mm 3.25 V 2.75 V Hittite
RS Stock No. 917-3438
Mfr. Part No.LTC6908CS6-1#TRMPBF
PHP134.59
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 5.5 V 2.25 V -
New
RS Stock No. 190-5970
Mfr. Part No.MAX2608EUT+T
BrandMaxim
PHP144.00
Each (In a Pack of 5)
units
VCO 300 → 500 MHz - 0.5pF SOT-23 - -40 °C +85 °C 3 x 1.75 x 1.3mm 1.3mm - 2.7 V -
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