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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
2005-04-01 Tool can cut design cycles by 80%
Analog Devices said that its latest version of its PLL circuit design and evaluation tool helps designers cut design cycles by up to 80 percent.
1999-04-08 Technical challenges and solutions for narrow-band (IS-95) CDMA
CDMA is the fastest growing wireless technology and is projected to be the leading technology worldwide in a few years. This paper presents a complete radio chipset for narrow-band CDMA (IS-95) and discusses the technical problems associated with IS-95. CDMA chipset system performance is presented based on simulation and measurements.
2004-05-26 TCE VCOs operate to 70MHz
The VCXO-1 series of VCOs from Jiangsu Changheng Group Top Crystal Electronic operates within the 1MHz to 70MHz frequency range.
2003-05-14 Tahoe RF ships IP blocks for multiple wireless apps
Tahoe RF Semiconductor's TRFS-151 CDMA RF front-end receiver and TRFS-201 integrated VCO IP blocks are aimed for use in multiple wireless systems.
2011-10-03 Synthesizers tout 0.37-5.79GHz frequency range
Linear Tech has released a family of integer-N frequency synthesizers with integrated VCO.
2000-11-30 Startup time, profile measurement of PLL VCOs and crystal oscillators
This application note intends to alleviate the anxiety and pain that have been associated with startup time and profile measurements of PLL VCOs and crystal oscillators by introducing a test setup that is user-friendly and convenient to build.
2004-11-16 Solving problems early on using co-verification
Learn the importance and benefits of hardware and software co-verification before the physical design becomes available.
2005-05-11 RF synthesizer includes VCOs
STMicroelectronics unveiled a multi-band RF synthesizer with embedded voltage controlled oscillators (VCOs), the first in a series of highly integrated RF solutions integrating PLL and VCOs.
2002-05-06 Pulling measurement of Z-COMM VCOs
This application note describes the pulling test setup and procedure of verifying measured pulling performance of Z-COMM VCOs.
2002-05-03 Proper output loading of the SMV2500L voltage controlled oscillator
This application note illustrates a test board which can be used to analyze the VCO and demonstrate how the proper selection of components and layout can minimize load pulling.
2009-08-26 PLL/synthesizers feature 10KHz step size
Crystek Corp. introduces a PLL/synthesizer that runs from 1,800MHz to 1,860MHz, with a step size of 10KHz.
2010-06-23 PLL synthesizer cuts need for active loop filters
Analog Devices Inc. has released a PLL synthesizer that can be used to directly drive high tuning-voltage external voltage-controlled oscillators, eliminating the need for active loop filters.
2002-05-03 Phase noise measurement of Z-COMM VCOs
This application note presents the procedures and setup of phase noise test for the purpose of verifying published phase noise performance.
2002-11-08 Phase Locked Loops (PLL) in High Speed Designs
This application describes the contruction of a phase detector in conjunction with a voltage controlled oscillator to create a frequency generator synthesizer.
2008-09-05 Oscillator handles 75-85MHz frequency range
Crystek Corp. has introduced the CVCO55FL-0075-0085 voltage controlled oscillator (VCO) that operates from 75 to 85 MHz with a control voltage range of 0.5 V to 4.5 V.
2002-11-20 ORCA Series 4 FPGA PLL Elements
This application note discusses the ORCA Series 4 FPGA PLL Elements, designed for the delivery of networking IP.
2004-12-01 On-chip VCOs can be digitally tuned
One common approach to designing VCOs in CMOS is to build a ring oscillator using a cascaded set of inverters that feeds back into itself.
2004-02-03 National expands RF product offerings
National Semiconductor Corp. has introduced the first member of its family of standalone, monolithic voltage-controlled oscillators (VCOs) for mobile handsets.
2002-11-29 MT9171/72 DNIC application circuits
This article presents the design of the MT9171/72 dnic application circuits.
2016-04-07 Moore's Law extended: Intel roadmap reveals CMOS at its core
Intel's future processors at 10nm and beyond will continue to use CMOS, but the cores will be surrounded by novel circuit architectures using new materials that may extend Moore's Law indefinitely.
2002-05-03 Manual soldering technique for Z-COMM VCOs
This application note describes common manufacturing methods used to solder Z-COMM surface-mount and pin-mount VCOs.
2002-02-19 M-tron crystal oscillators range to 800MHz, run off 3.3V
M-tron Industries Inc. has launched two lines of 5-by-7mm crystal oscillators with frequency capability between 750kHz and 800MHz.
2003-05-27 Identifying phase noise sources in a PLL
This application note details a simple technique for restricting PLL bandwidth to enable the phase noise of the VCO alone to be measured, while still locked in the PLL.
2002-03-20 IBM announces new processes for wireless chip fab
Targeting companies that manufacture wireless devices such as cell phones, IBM has announced the development of two new foundry processes for fabricating chips for consumer products.
2002-08-16 Hidden complexities of PLLs are revealed
Measuring PLLs in a quiet, low-noise environment can yield optimistic and misleading jitter results.
2001-09-20 HF-VHF-UHF voltage controlled oscillators using Hyperabrupt tuning diodes
This application note is intended to assist the VCO designer in realizing the excellent performance attainable through the use of ion-implanted hyperabrupt tuning diodes.
2013-05-28 GCS unveils two InGaP HBT foundry processes
In addition to maintaining the super low phase noise performance offered by the company's D1 VCO process, the D5 InGaP HBT process offers an advantage of a wider (2x) frequency tuning range.
2003-04-01 Finding the right tests for Bluetooth radio design
Bluetooth radio designs utilize a variety of system architectures; however, there are several issues that must be addressed in the course of developing a product, regardless of how the design is configured.
2002-02-01 Effective testing for Bluetooth transceiver ICs
This technical article describes how the RF front-end transceiver can effectively address the respective types of test parameters defined in Bluetooth technology.
2010-07-02 Dual-output VCOs cover 7.3GHz to 8.8GHz
Endwave Corp. has launched the EWV0800YF series of voltage-controlled oscillators (VCOs) with dual outputs with total frequency coverage of 7.3GHz to 8.8GHz and 3.65GHz to 4.4GHz.
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