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What are VCOs?
Voltage controlled oscillators (VCOs) can be tuned over a wide range of frequencies by applying a voltage (tuning voltage) to it. This type of oscillator is less costly than crystal oscillators, but not as stable.
total search288 articles
2004-05-19 Crystek 5GHz VCO available in SMD package
Continuing to expand the frequency range of its high-performance voltage-controlled oscillator (VCO) lines, Crystek Crystals Corp. has added a new 5GHz model in a 1.27-by-1.27cm standard surface-mount package to its CVCO55 family.
2013-04-17 Coaxial-based VCO boasts frequency doubling feature
The oscillatoroperates at 6400MHz with a tuning voltage range of 0.3 Vdc to 4.7 Vdc and it features a typical phase noise of -100 dBc/Hz @ 10kHz offset and has good linearity.
2004-12-16 Coaxial resonators for VCO applications
This app note introduces the designer to Skyworks' coaxial resonator, outlines its use in a VCO, and details the method of selecting the correct part.
2001-04-05 Clock regenerator with crystal-controlled phase-locked loop VCO (NE564)
This application note discusses how to achieve clock regeneration using Philips Semiconductors' NE564 crystal-controlled PLL.
2002-11-08 CDMA Cellular VCO with the BFG425W, BFG410W and Varactor BB142
This application note contains an example of a Voltage Controlled Oscillator for cellular CDMA Applications with the fifth generation BFG425W and BFG410W Double Poly RF-transistors.
2007-03-12 APN1012: VCO designs for wireless handset and CATV set-top applications
VCOs have come to the forefront of RF designs together with the first PLL circuits. In the era before the PLL, oscillators were mostly free running, and only in rare cases were varactors used for modulation or temperature compensation. Nowadays, we rarely see free running oscillators, instead they have become varactor-controlled oscillators. This is because most RF applications require band coverage, which can be realized through the PLL circuit requiring two sources of RF power. The reference source frequency is often a VCXO or TCXO, while the other frequency is controlled by the PLL phase detector.
2007-03-12 APN1004: Varactor SPICE models for RF VCO applications
This varactor model is useful for RF VCO applications although it neglects some parasitic components often needed for higher frequency microwave applications, such as the distributed line package model and some capacitance due to ground proximity. For most RF VCO applications, to about 2.5GHz, these parasitic components would not be important unless higher harmonics generated by the varactor affect performance of the VCO. In this case, a more detailed equivalent circuit model is needed. The technique used should be based on the varactor model extraction procedure from S-parameter data.
2002-01-08 Agilent VCO chips suit 40Gbps fiber-optic systems
The company has introduced a family of surface-mount voltage-controlled oscillators (VCOs) targeted at next-generation high-speed 40Gbps fiber-optic communications systems.
2003-04-21 ADI quad-band GSM transceiver integrate VCO
Analog Devices Inc.'s OthelloOne TV quad-band GSM/GPRS transceiver includes all the features of previous Othello devices but integrates an on-chip VCO.
2002-09-20 A VCO design for wlan applications in the 2.4GHz to 2.5GHz ISM band APN1010
This application note describes the design of RF and IF VCOs for a 2.4GHz to 2.4835GHz WLAN application.
2001-04-19 A low phase noise VCO design for PCS handset applications
This application note describes the design and performance of a VCO centered at 1.75GHz for a PCS handset that utilizes Alpha's SMV1763-079 varactor diode.
2001-04-19 A dual-band switchable IF VCO for GSM/PCS handsets
This application note discusses the design of a dual-band switchable VCO, which utilizes Alpha's PIN and varactor diodes, suitable for GSM/PCS cellular phones.
2001-04-19 A differential VCO design for GSM handset applications
This application note attempts to build a bridge toward better understanding of the differential VCO by describing a design covering the 910MHz to 980MHz range, which is appropriate for use in GSM handsets.
2002-10-24 A differential VCO design for GSM handset applications
This application note extensively discusses the differential VCO by describing a design covering a 910MHz to 980MHz frequency range that is apt for use in GSM handsets.
2002-09-20 A Colpitts VCO for wideband (0.95GHz to 2.15GHz) set-top TV tuner applications
This application note describes the design of a broadband Colpitts VCO that incorporates the SMV1265-011 varactor diode.
2001-04-19 A Colpitts VCO for wideband (0.95- to 2.15GHz) set-top TV tuner applications
This application note describes the design of a broadband Colpitts VCO that incorporates Alpha's SMV1265-011 varactor diode.
2001-04-19 A balanced wideband VCO for set-top TV tuner applications
This application note addresses the design of a balanced-type VCO based on Alpha's SMV1265-011 varactor with a unique set of capacitance tuning ratios and quality factor.
2002-09-20 A balanced wideband vco for set-top tv tuner applications
This application note the design of the balanced-type voltage control oscillator (VCO) based on the newly developed varactor SMV1265-011 with the unique set of capacitance tuning ratios and Q-quality.
2002-06-12 Voltage controlled crystal oscillators, voltage controlled oscillators
This application note discusses the different characteristics and specifications, as well as design considerations, that are unique to voltage controlled crystal and non-crystal oscillators.
2005-07-15 VCOs support industrial, automotive and military apps to 24.8GHz
Hittite Microwave announced the release of three new GaAs HBT MMIC Voltage Controlled Oscillators for Point to Point/Multipoint, VSAT, Test Equipment and Industrial applications at 11-, 12- and 24GHz
2006-02-28 VCOs output cover 11.5 to 14.9GHz
Hittite Microwave has extended its line of GaAs HBT MMIC voltage-controlled oscillators with fundamental, half and quarter frequency outputs.
2010-05-25 VCOs lower energy consumption in base stations
RF Micro Devices is rolling out a new family of laminate-based voltage-controlled oscillators (VCOs) for cellular infrastructure and other high-performance wireless transceiver applications.
2002-09-27 VCOs hit 10Gbps and 40Gbps apps
Designed for 10Gbps and 40Gbps applications, VCOs from Agilent Technologies Inc. perform the MUX, DMUX, and clock/data recovery functions required for board and line card designs, delivering sub-50-femtosecond jitter performance.
2007-02-07 VCOs feature coaxial resonator oscillator
Crystek has expanded its line of ultralow-phase-noise VCOs with a coaxial resonator oscillator.
2006-10-05 VCOs deliver 'excellent' phase noise performance
Hittite Microwave's new VCOs are said to exhibit excellent phase noise performance up to -116dBc/Hz at 100kHz over temperature, shock and process variations.
2003-08-29 Using Two-Point Modulation to reduce Synthesizer Problems when Designing DC_Coupled GMSK Modulators
This application note discusses the problems encountered when designing GMSK modulators with respect to the characteristics of PLL frequency synthesizers, and illustrates how two-point modulation can be used to solve them.
2002-12-09 Using two-point modulation to reduce synthesizer problems when designing dc-coupled GMSK modulators
This application note describes the problems encountered when designing GMSK modulators with respect to the characteristics of PLL frequency synthesizers
2002-04-19 Using the LOCK output from GIGA receivers
This application note explains the operation of the LOCK output from the PLLs of the high-speed devices from GIGA.
2002-05-06 Using convection ovens for attaching Z-COMM VCOs
This application note describes the suggested time-temperature reflow profile for properly attaching of Z-COMM VCOs to PCBs utilizing convection oven techniques.
2002-05-03 Using bipolar biasing to obtain the full tuning range capability of Z-COMM VCOs
This application note illustrates the recommended configuration for proper 115V operation.
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