Product category:
Frequency Control Components
News Release from: Temex | Subject: Frequency-control components for WiMAX
Edited by the Electronicstalk Editorial
Team on 06 June 2006
Frequency-control components suit WiMAX
tasks
Frequency-control components for WiMAX applications include low-phase-noise VCOs, low-phase-noise VC-TCXOs and high-rejection IF SAW filters.
Temex has developed a new range of frequency-control components for WiMAX applications The range includes two low-phase-noise VCOs (voltage controlled oscillators), one low-phase-noise VC-TCXO (voltage controlled, temperature controlled crystal oscillators), and three high-rejection IF SAW filters (intermediate frequency surface acoustic wave filters)
This article was originally published on Electronicstalk on 31 Jan 2003 at 8.00am (UK)
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This new VCO provides an average tuning sensitivity of 12MHz/V and typical harmonic suppression of -10dBc.
It also guarantees an output power of at least +3dBm over a temperature range of -40 to +85C.
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It covers a 194MHz bandwidth from 1 to 20V.
At higher frequencies, VLB3661, with a frequency range of 3660-3960MHz, offers a low phase noise performance of -96dBc/Hz at a 10kHz offset away from carrier.
This VCO has an average tuning sensitivity of 32MHz/V and a typical harmonic suppression of -10dBc.
It also guarantees an output power of at least +3dBm over a temperature range of -40 to +85C.
It covers a 330MHz bandwidth from 1 to 20V.
These VCOs both comply with the RoHS, the European Union's restriction of hazardous substances directive, and are suited for automated surface mount assembly and lead-free reflow.
They are available in tape-and-reel packaging for production requirements.
The CVT 5347A, with a frequency of 30MHz is a new VC-TCXO based on direct analogue compensation design.
It offers a low phase noise performance of -135dBc/Hz at a 1kHz offset away from carrier.
CVT 5347A provides a maximum tolerance of +/-3.0ppm and typical harmonic suppression of -5.0dBc maximum.
It also guarantees a frequency stability of +/-3.0ppm over a temperature range of -30 to +75C.
The CVT5347 is compatible for lead-free reflow soldering process with a peak reflow temperature of 260C and is RoHS compliant.
Using its experience and knowhow in the development and production of IF filters for wireless infrastructures, the company is well placed to support the upcoming market for WiMAX applications.
Today, Temex offers the TMX W520, a high rejection SAW filter at 456MHz.
Its bandwidth at -3dB is 3.7MHz.
This new SAW filter offers a rejection of at least 40dB at +/-3.35MHz, over a temperature range of -40 to +85C.
The TMX W520 is available in a 8 x 5 x 1mm ceramic package and is RoHS compliant.
The TMX W540 SAW filter is also suited for the chipmakers standard, with a high rejection at 380MHz.
Its bandwidth at -3dB is 3.7MHz.
This new SAW filter offers a rejection superior to 40dB at +/-3.35MHz and is also available in a 8 x 5 x 1mm ceramic package.
For high-speed WiMAX applications, the TMX W507 SAW filter at 140MHz is outstanding with bandwidth at -3dB is 8.4MHz.
This new SAW filter offers a rejection superior to 40dB at +/-8MHz and available in a 13 x 8 x 1.5mm ceramic package sise.
"Super-heterodyne architecture allows greater flexibility in terms of frequency planning and filtering".
"This architecture is therefore mandatory in WiMAX systems which have to deal with several RF frequencies: 2.5, 3.5 and 5.8GHz".
"The transmitter requires a high rejection SAW filter to provide the required degree of LO (local oscillator) and image attenuation".
"The receiver requires a high selective SAW filter to meet adjacent channel rejection requirements and spurious filtering".
"Thanks to its long-standing experience in the design and manufacture of SAW filters, Temex meets these requirements with low insertion loss and sharp transition from passband to high level rejection band together with low cost and high reliability", says Stephane Chamaly, a Temex Field Application Engineer.
All components described above are RoHS compliant and available for system validation.
Customised IF SAW filters are available on request.
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