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. 442-864
Mfr. Part No.SN74LS624N
£3.17
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. 145-1166
Mfr. Part No.SN74LS624N
£2.842
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. 442-870
Mfr. Part No.SN74LS629N
£2.46
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. 923-2473
Mfr. Part No.SN74LS629N
£2.315
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. 423-462
Mfr. Part No.LTC6908CS6-1#TRMPBF
£3.22
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 5.5 V 2.25 V -
RS Stock No. 917-3438
Mfr. Part No.LTC6908CS6-1#TRMPBF
£1.973
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 -
RS Stock No. 799-2811
Mfr. Part No.MAX2750EUA+
£5.45
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. 165-9525
Mfr. Part No.MAX2750EUA+
£4.214
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. 162-7068
Mfr. Part No.SN74LS628NE4
£2.236
Each (In a Tube of 25)
Units
- 1.1 → 25 MHz - 45pF SOIC Squarewave 0 °C +70 °C 19.3 x 6.35 x 4.57mm 4.57mm 5.25 V 4.75 V -
RS Stock No. 662-4573
Mfr. Part No.SN74LS628NE4
£2.804
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. 160-2702
Mfr. Part No.HMC586LC4B
£144.506
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. 862-6417
Mfr. Part No.HMC586LC4B
£158.96
Each
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. 672-1390
Mfr. Part No.FVXO-HC73BR-27
£5.00
Each
Units
VCO 27 MHz ±50ppm 15pF - HCMOS -40 °C +85 °C 7 x 5 x 1.4mm 1.4mm 3.465 V 3.135 V -
RS Stock No. 160-2661
Mfr. Part No.HMC510LP5E
£25.206
Each (On a Reel of 50)
Units
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 5.25 V 4.75 V Hittite
RS Stock No. 806-2567
Mfr. Part No.MC100EL1648DG
£7.92
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. 163-0465
Mfr. Part No.MC100EL1648DG
£6.74
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. 862-6161
Mfr. Part No.HMC510LP5E
£30.39
Each
Units
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 5.25 V 4.75 V Hittite
RS Stock No. 672-1520
Mfr. Part No.FVXO-HC53BR-8.192
£4.33
Each
Units
VCO 8.192 MHz ±50ppm 15pF - HCMOS -40 °C +85 °C 5 x 3.2 x 1.4mm 1.4mm 3.465 V 3.135 V -
RS Stock No. 160-9957
Mfr. Part No.HMC385LP4E
£7.32
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. 862-6089
Mfr. Part No.HMC385LP4E
£7.44
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
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