Circuit Components I Product News VPG releases FSR secondary standard resistor
Thin-film capacitors in 0402 with a high Q factor
TDK-EPC has unveiled the TDK TFSQ0402 series of thin-film capacitors in a 0402 (EIA 01005) package. Under the product name Z-match the new capacitors are designed for power amplifier circuits and RF matching circuits in smartphones, mobile phones, wireless LANs and other communication technologies. Mass production started in August 2011. In order to create the new line of high-
frequency components with low ESL and ESR, TDK EPC used an advanced thin-film technology to manufacture HDD magnetic heads. As a result it was able to create a new line of compact, low-profile components. Thanks to the thin-film process Z-match capacitors achieve an extremely tight tolerance of ± 0.05 pF and a Q factor that is 150 percent higher than that of existing products (2.2 pF at 2 GHz). Furthermore, the new components offer a high self-resonant frequency (SRF) of 6.8 GHz (2.2 pF). The terminations of the Z-match series are located on the bottom surface of the components, and a very exact dicing process ensures that the component dimensions are extremely precise, making them especially suitable for mounting on modules. The components have an operating temperature range of -55 to +125 °C and are designed for use at high frequencies from 2.4 to 6 GHz.
TDK |
www.tdk.com
Vishay Precision Group has announced that its Vishay Foil Resistors division (VFR) has introduced a breakthrough secondary standard resistor for laboratory calibration standards and digital multimeters (DMM). For test equipment designers, the new FSR offers exceptionally high accuracy of 10 ppm at the terminals, long-term stability of ±0.0005% (5 ppm) at +25°C for one year, temperature coefficient of resistance (TCR) to ±0.3 ppm/°C from +15°C to +45°C (Max TCR: 10 ppm to 30 ppm total deviation over temperature range), and resistance tolerance to ±0.005% (50 ppm). Offering a direct plug-in device for most DMMs, the FSR is based on a new design that uses Bulk Metal Foil technology, resulting in a combination of standard features with new benchmark capabilities for accuracy, stability, and speed. By using VFR precision resistors instead of the inductive resistors featured in most secondary standard boxes, the FSR allows for controllable accuracy at the box terminals through calibration, while extending the frequency range by up to 10 times.
The device is intended for adjustable, direct
reading resistance and serves as a substitution component for RTD, bridges, attenuators, voltage dividers, multipliers, adjustable feedback resistors for use with operational amplifiers, and network ladder elements. In addition, the FSR greatly extends the usefulness range for these instruments due to its high-frequency performance, making them ideal for use in inspection stations, in the standards laboratory, and for component evaluation. The FSR offers virtually infinite resolution in
resistance setting and readability. The device is available with up to six significant digits (e.g. 9.99962), and a wide resistance range from 1 to 150 k, with any resistance value within this range available at any tolerance with no additional cost or lead time effect. For increased reliability, the resistor standard features an RF- shielded case, while its hermetically sealed resistive element eliminates the effects of humidity. The FSR offers a small size and robust, four-terminal construction with an additional banana socket for external ground, and is supplied with a certificate of accuracy traceable to NIST.
The resistor standard features a rise time of 1.0 ns, with effectively no ringing, a thermal stabilization time of <1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0.010 µVrms per volt of applied voltage (<-40 dB), and a voltage coefficient of <0.1 ppm/V. The device offers a non-inductive (<0.08 H), non-capacitive design, and is capable of withstanding electrostatic discharges to at least 25 kV without degradation.
Vishay Foil Resistors |
www.vishayfoilresistors.com
High voltage multilayer ceramic capacitors for higher reliability applications KEMET has unveiled its KEMET Power Solutions
(KPS) High Voltage (HV) SM Series of capacitors. Designed to meet robust performance standards required in higher reliability industrial applications, the KPS family of devices utilises leadframe technology to isolate the multilayer ceramic component from the printed circuit board.
KPS HV SM Series devices offer up to 10mm
of board flex capability and exhibit lower ESR, ESL and higher current discharge capability when compared to other dielectric solutions. Available in both formed “L” and “J” lead configurations,
these products offer additional screening options, including Group A and Group B testing/inspection per MIL-PRF-49467. Typical markets include power supply, LCD
fluorescent backlight ballast, HID lighting, telecom equipment, industrial and medical equipment/control, military and downhole exploration. Typical applications include switch mode power supplies (input filters, resonators, tank circuits, snubber circuits, output filters), high voltage coupling and DC blocking, voltage multiplier circuits, DC/DC converters and coupling capacitors in Cuk converters, noise reduction
GPS disciplined OCXO module unveiled
been designed to ensure extreme accuracy derived from satellite GPS control and the inherent accuracy of its internal precision OCXO. Frequency correction signals are applied to the internal OCXO providing accuracy approaching 10-12, one thousandth part per billion, and rivaling a Caesium standard at a fraction of the cost.
Total Frequency Control Limited have released the latest precision GPS controlled OCXO additional to their line of OCXO, TCXO and VCXO products. The PT626 - 1000 - GPS has
According to Managing Director Edward Mills, “This is a huge achievement in the development of GPS stabilisation for precision quartz oscillators and puts RFX at the forefront of this important sector. The miniature size of the unit makes it attractive for all new OEM designs and the obvious replacement for many base station oscillators where the improved accuracy will
enhance functionality and performance.” This product has been designed for use in Base Stations, Wireless Networks, System Synchronisation systems, Instrumentation, Critical timing and Calibration applications. In the event of the GPS signal being temporarily lost the PT626 - 1000 - GPS retains it previously acquired control settings and accuracy through the internal precision OCXO. RFX manufacture a complete range of
precision oscillators from 1MHz to 2.4GHz including TCXO, VCXO, PLL and GPS modules.
Total Frequency Control Limited |
www.tfc.co.uk
AVX develops dual element mulitlayer varistor with high ESD value
The AVX corporation, a manufacturer of passive components and interconnect solutions, has expanded its rugged automotive portfolio to include a miniature, dual element AC multilayer varistor designed for use in automotive low power AC circuits. Designated the MAV Series, the AEC Q200-qualified MLV not only has the ability to clamp large amounts of transients in a bi-directional manner, but also provides and excellent EMI/RFI attenuation in the off-state, making it unsurpassed in efficiency as well as safety.
The MAV Series provides a 110V peak-to- peak at125kHz capability and an ESD value of 25kV (HBM ESD Level 6). Featuring low loss characteristics, the ability to handle large amounts of transients, and a sub-nanosecond
38 September 2011
turn-on time that clamps energy before peak, all in an ultra-compact package, the MAV Series is ideal for use in automotive applications including AC circuits, LC resonant circuits, transformer secondaries, and GFI modules. In addition to developing a highly efficient
MLV, AVX also managed to significantly reduce the MAV Series' footprint, thus meeting space and weight constraints typical of automotive and harsh environment applications. Available in 0603 single-element and 0405 dual-element packages, the RoHS compliant product is AEC Q200 qualified with PPAP documentation available upon request.
AVX |
www.avx.com Components in Electronics
The Crystek Corporation has launched the CCHD-575, an Ultra-Low Phase Noise CMOS Oscillator providing a -168 dBc/Hz noise floor. Both compact and powerful, the CCHD-575 is, according to the company, the industry’s lowest- jitter clock oscillator in a 5 x 7.5 mm package. The CCHD-575 features a typical phase jitter of 82 fSec RMS at 100 MHz. Close-in phase noise is -90 dBc/Hz @ 10 Hz, while its floor is at - 168 dBc/Hz. The extremely low phase noise performance is very useful in applications such as: DACs (digital-to-analogue converters), ADCs (analogue-to-digital converters), low phase signal sources, and test & measurement. The CCHD-575 generates frequencies between 50MHz and 130MHz. Its output driver is capable of driving ±24mA, translating to a rise/fall time of ~600ps at 100 MHz with a 15pF load. Input supply voltage of 3.3Vdc consuming 15mA of current is required. Extended temperature operating range of -40°C to +85°C is also available.
Crystek Corporation |
www.crystek.com www.cieonline.co.uk
(piezoelectric/mechanical), circuits with a direct battery or power source connection, critical and safety relevant circuits without (integrated) current limitation and any application that is subject to high levels of board flexure or temperature cycling. “KPS technology provides advanced mechanical and thermal stress performance,” said Bill Sloka, Specialty Product Manager. “KPS SM Series devices are engineered with robust chip designs for higher reliability applications.”
Kemet |
www.kemet.com
New ultra-low phase noise CMOS oscillator
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