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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
1999-06-29 Design challenges for a multi-standard 2.4GHz FHSS WLAN radio
This article takes a solution-oriented approach in presenting a viable architecture and implementation detail of a 2.4GHz to 2.5GHz radio and wireless data controller that serves the wireless applications.
2007-08-10 DAC5686/DAC5687 clock generation using PLL and external clock modes
The DAC5686 and DAC5687 both have an onboard PLL and VCO, which allows for some diversity in the input clock, data rates and the update rate of the DAC.
2003-12-15 Crystek VCOs feature -115dBc/Hz phase noise
Crystek Crystals Corp. has launched a line of voltage controlled oscillators (VCOs) designed for use in applications such as digital radio equipment, fixed wireless access, satellite communications systems, base stations, personal communications systems, portable radios, and test instruments.
2010-08-13 CRO tips frequency doubling for low phase noise, harmonics
The coaxial resonator oscillator is a VCO that offers improved performance and lower current consumption for is suited for applications such as digital radio equipment, fixed wireless access, satellite communications systems,and base stations.
2015-05-14 Connecting passive components to logic gates
By adding a few passive components, you can make circuits such as level converters, frequency multipliers, phase detectors, line drivers, and pulse changers.
2015-02-23 Configurable clock synthesiser touts low phase noise jitter
The XR81411 from Exar is capable of generating any frequency in the range of 10MHz to 800MHz with four independent PLLs, using a highly flexible delta-sigma modulator and a wide ranging VCO.
1999-11-19 Clock sources on the VIDC20 graphics controller
This application note deals the suitable high frequency clock with the VIDC20 in facilitating high-resolution screen modes.
2015-09-10 Clock jitter attenuator boosts JESD204B serial interface
The HMC7044 offers a wide range of clock management and distribution features that make it possible for designers of base stations to build an entire clock design with a single device.
2003-05-27 Charge Pump saturation effects in PLL frequency synthesizers
This application note discusses how charge pump limiting can have a significant impact on the lock time, even if the phase detector output swing comfortably covers the required VCO tuning range.
2002-02-23 Basic compressor/limiter design
This application note describes THAT Corp.'s 2252 rms-level detector and 2180/2181 series voltage-controlled amplifiers to make a basic above-threshold compressor/limiter.
2002-05-03 Band switching voltage controlled oscillators
This application note describes how additional tuning bandwidth can be obtained by band-switching two VCOs with a TTL compatible input.
2005-08-01 Ain't no mountain high enough for DAB
Digital audio broadcasting overcomes multipath signal distortion problems in big leaps and bounds
2004-02-02 AAC Electronics VCOs have <15mA current
Designed to suit cellular stations and GPS systems, the voltage control oscillator (VCO) from Shenzhen AAC Electronics Corp. features a <15mA current and 2.84V 0.1 supply voltage.
2003-09-16 A summary of PLL and clock system design
An on-chip PLL can eliminate the delay between the external and internal clock caused by on-chip clock driver delay.
2002-12-02 A low cost 1.5GHz to 2.2GHz voltage controlled oscillator
This article describes a low cost 1.5 to 2.2GHz voltage controlled oscillator.
2015-05-26 Wideband RF synthesiser/PLL operates on low power
The 8V97051 contains an integrated voltage-controlled oscillator (VCO) with a large tuning range capable of providing multi-band local oscillator (LO) frequency synthesis.
2003-04-29 Toshiba rolls 2.4GHz radio transceiver
The TB32301AFL 2.4GHz radio transceiver from Toshiba Corp. incorporates a low-noise amplifier, FM detector, and VCO in a 36-pin QON package.
2000-12-13 The MC145170 in basic HF and VHF oscillators
This application note demonstrates how the MC145170 PLL chip can be implemented in a PLL frequency synthesizer design, along with an LPF and a VCO/VCM.
2005-08-25 Synthesizers serve 1GHz to 5GHz
Crystek has introduced the CPLL66 family of complete PLL/synthesizers that need only an external frequency reference and supply voltages for the internal PLL and VCO
2008-02-18 Single-chip WiMAX RF transceiver halves BOM
Maxim's MAX2838 single-chip WiMAX RF transceiver eliminates the costly SAW filter and extra VCO circuitry required by existing superheterodyne solutions, thus saving 50 percent on BOM as well as reducing component count and board space.
2014-12-08 JESD204B clock device targets LTE, GSM base stations
The AD9528 from ADI offers a low-power, multi-output, clock distribution function with low-jitter performance, along with an on-chip, two-stage PLL and VCO, to tackle GSPS data converter applications.
2013-05-20 IDT targets high-performance comm, networking apps
IDT's latest offerings claim to enable the industry's lowest phase noise voltage-controlled oscillator (VCO) and fractional output divider to solve phase noise-related challenges.
2000-06-29 Frequency/Phase comparator for phase-locked loops
This application note describes a phase comparator that permits PLLs to be constructed using LCA devices, which only require an external VCO and integrating amplifier.
2000-09-01 Digital frequency/Phase comparator (DFPC)
This application note demonstrates how to implement the AT6000 Series FPGA as a digital frequency/phase comparator (DFPC) that interfaces to a voltage-controlled oscillator (VCO).
2007-02-27 Clocking High-Speed A/D Converters
Extremely high-speed ADCs demand a low-jitter sample clock in order to preserve SNR. These 8bit and 10bit converters have best-case noise floors set by quantization noise. In this article, we look at the strategy for optimizing the performance of the sample clock based on PLL/VCO characteristics. This means minimizing overall integrated phase noise, which minimizes clock jitter.
2014-12-04 Clock IC from ADI aimed at GSPS data converter apps
The JESD204B-compatible AD9528 has an on-chip VCO that tunes from 3.6-4GHz, with the input receivers and oscillator providing both single-ended and differential operation.
2002-01-11 Atmel remote-control receiver handles 1kBaud to 10kBaud rates
The T5743N remote-control receiver, a multichip PLL receiver with fully integrated VCO, is designed for employment in keyless-entry, telemetering and security systems.
2006-03-28 AMIC unveils GPS receiver
AMIC Communication launched its first GPS receiver IC that integrates an LNA, image rejected mixer, IF band pass filer, IF VGA amplifier, VCO, PLL, 2bit ADC and internal regulator.
2001-04-04 10.8MHz FSK decoder with NE564
This application note describes how to use the internal voltage comparator and VCO of Philips Semiconductors' NE564 PLL to perform FSK demodulation.
2002-12-13 Zarlink radio module integrates receiver, transmit functions
The ZL20200 radio transceiver is touted to be the first commercial device to successfully integrate call receiver and call transmit circuitry in a single chip.
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