VCO Voltage Controlled Oscillators

VCO Voltage controlled oscillators 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 VCOs?



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 Output Frequency Frequency Tolerance Frequency Stability Frequency Ageing Tuning Voltage Control Parameter Maximum Symmetry Mounting Type Package Type Pin Count Load Capacitance Output Level Dimensions Height
RS Stock No. 442-870
Mfr. Part No.SN74LS629N
TWD143
Each
units
1.1 → 25 MHz - - - 0 → 5V - 50% Through Hole PDIP 16 45pF Squarewave 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 923-2473
Mfr. Part No.SN74LS629N
TWD143
Each (In a Tube of 25)
units
- - - - - - - Surface Mount SOIC 16 - - 19.3 x 6.35 x 4.57mm 4.57mm
RS Stock No. 244-2399
Mfr. Part No.VCXO010450
BrandIQD
TWD1,259
Each
units
12.288 MHz - ±50ppm - 0.5 → 4.5V - 60% Through Hole PDIP 14 15pF HCMOS, TTL - -
RS Stock No. 709-9293
Mfr. Part No.TCETBDSANF-30.72MHz
BrandTAITIEN
TWD170
Each
units
30.72 MHz ±2ppm ±1ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 10 10pF Clipped Sinewave 7 x 5 x 2mm 2mm
RS Stock No. 160-2707
Mfr. Part No.HMC733LC4B
TWD10,812
Each (On a Reel of 50)
units
10 → 20 GHz - - - -0.25 → 23V Temperature, Voltage - Surface Mount SMT 24 - - 4 x 4 x 1.2mm 1.2mm
RS Stock No. 506-2198
Mfr. Part No.LTC3455EUF#PBF
TWD136
Each
units
1kHz - 68MHz - - - - - - Surface Mount MSOP 8 - - 3 x 3 x 0.86mm 0.86mm
RS Stock No. 862-6442
Mfr. Part No.HMC733LC4B
TWD10,502
Each
units
10 → 20 GHz - - - -0.25 → 23V Temperature, Voltage - Surface Mount SMT 24 - - 4 x 4 x 1.2mm 1.2mm
RS Stock No. 145-6905
Mfr. Part No.LTC3455EUF#PBF
TWD109
Each (In a Tube of 50)
units
1kHz - 68MHz - - - - - - Surface Mount MSOP 8 - - 3 x 3 x 0.86mm 0.86mm
RS Stock No. 478-9230
Mfr. Part No.LFVCXO011125
BrandIQD
TWD1,030
Each
units
10 MHz - ±50ppm - - Voltage 60% Through Hole PDIP 14 15pF HCMOS, TTL 21 x 13.08 x 5.1mm 5.1mm
RS Stock No. 163-0049
Mfr. Part No.NBVSPA019LNHTAG
TWD477
Each (On a Reel of 100)
units
125 MHz - ±50ppm ±3 ppm/yr - Voltage 55% Surface Mount CLCC 6 - LVDS 7 x 5 x 1.9mm 1.9mm
RS Stock No. 160-2662
Mfr. Part No.HMC511LP5E
TWD1,219
Each (On a Reel of 50)
units
4.525 → 5.075 (Output 2) GHz, 9.05 → 10.15 (Output 1) GHz - - - 2 → 13V Temperature, Voltage - Surface Mount QFN 32 - - 5.1 x 5.1 x 1mm 1mm
RS Stock No. 165-9525
Mfr. Part No.MAX2750EUA+
BrandMaxim
TWD225
Each (In a Tube of 50)
units
2400 → 2500 MHz - - - 0.4 → 2.4V Voltage - Surface Mount μMAX 8 220pF - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 709-9268
Mfr. Part No.TCETBDSANF-12.8MHz
BrandTAITIEN
TWD135
Each
units
12.8 MHz ±2ppm ±1ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 10 10pF Clipped Sinewave 7 x 5 x 2mm 2mm
RS Stock No. 709-9470
Mfr. Part No.R0053-T-069-3
BrandTAITIEN
TWD89
Each
units
20 MHz ±2ppm ±2.5ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 4 10pF Clipped Sinewave 2.5 x 2 x 0.9mm 0.9mm
RS Stock No. 672-1378
Mfr. Part No.FVXO-HC73BR-10
TWD240
Each
units
10 MHz - ±50ppm - 0 → 3.3V - 45/55% Surface Mount - 6 15pF HCMOS 7 x 5 x 1.4mm 1.4mm
RS Stock No. 675-8799
Mfr. Part No.CTAMC7L-A3B3-16.00TS
BrandCardinal
TWD1,000
Each
units
16 MHz 1.5ppm ±2.5ppm ±1 (First Year) ppm/yr - Temperature 55% Surface Mount SMD 6 15pF CMOS 7.2 x 5.2 x 3.3mm 3.3mm
RS Stock No. 423-462
Mfr. Part No.LTC6908CS6-1#TRMPBF
TWD100
Each
units
50 kHz → 10 MHz 1.5% 300ppm/√kh - - Resistor 55% Surface Mount TSOT-23 6 5pF CMOS 2.9 x 1.5 x 0.9mm 0.9mm
RS Stock No. 709-9432
Mfr. Part No.R0053-T-056-3
BrandTAITIEN
TWD89
Each
units
38.4 MHz ±2ppm ±2ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 4 10pF Clipped Sinewave 3.2 x 2.5 x 1mm 1mm
RS Stock No. 709-9357
Mfr. Part No.R0053-T-033-3
BrandTAITIEN
TWD108
Each
units
12.8 MHz ±1.5ppm ±2ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 4 10pF Clipped Sinewave 5 x 3.2 x 1.2mm 1.2mm
RS Stock No. 709-9442
Mfr. Part No.R0053-T-060-3
BrandTAITIEN
TWD89
Each
units
12.8 MHz ±2ppm ±2.5ppm ±1 ppm/yr - Temperature 55% Surface Mount SMD 4 10pF Clipped Sinewave 2.5 x 2 x 0.9mm 0.9mm