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Bob's Mailbox: Readers Respond To Recent Columns
Readers offer analog guru Bob Pease their own anecdotes about working on sensor arrays, noise rejection, and driving one-handed.
Bob's Mailbox: Readers Respond To "What's All This Little Guy Stuff, Anyhow?"
Design guru Bob Pease exchanges some correspondence with readers about his August 13 column, "What's All This Little Guy Stuff, Anyhow?"
What’s All This Driving One-Handed Stuff, Anyhow?
Analog design guru Bob Pease tackles the challenges of driving his 1969 Beetle with one hand, as he takes us on a couple of test drives.
Bob's Mailbox
Design guru Bob Pease answers reader questions about how to build a variable-frequency power supply and 2N706 circuit failures.
LNA Boosts ISM Band Performance Without Penalty
In many industrial, scientific, and medical (ISM) band wireless applications, receiver sensitivity greatly limits the range and reliability of the radio link. One way to get greater sensitivity is to add more gain. But that works well only if the noise figure is good enough. The Maxim Integrated Products MAX2634 solves that problem for some applications. This low-noise amplifier (LNA) for the 315- and 433-MHz ISM bands improves receiver sensitivity and offers an ultra-low 1.25-dB noise figure.
UHF And S-Band VCOs Offer Ultra-Low Phase Noise And High Harmonic Suppression
The ZRO0837H1LF voltage-controlled oscillator (VCO) from Z-Communications operates from 830 to 845 MHz. It offers a tuning voltage range of 0.5 to 4.5 V with a tuning sensitivity of 7 MHz/V. Meanwhile, the company’s CRO3562A-LF VCO suits the S band and operates from 3560 to 3564 MHz with a tuning voltage of 1.5 to 4.5 V and a sensitivity of 8 MHz/V.
Upstream Cable TV Amplifier Boasts Low Power Consumption
As cable TV (CATV) companies upgrade their systems to the new DOCSIS 3.0 specifications, low power dissipation has become a major factor. While the downstream path is still the focus of most systems, the upstream needs have increased as more two-way monitor and control functions have been implemented and Voice over Internet Protocol (VoIP) systems have become common. The MAX3518 from Maxim Integrated Products addresses these upstream amplification needs.
What's All This "Little Guy" Stuff, Anyhow?
Bob Pease has a reputation for helping his readers out with problems, sometimes sending them samples, even when they aren't big customers. That's because he believes in helping the "little guy." Also, working these problems out often helps him learn something new.
S2K Conference Delights This U.S. Editor
Editor-in-Chief, Joe Desposito, writes a wrap-up of the 2009 S2K semiconductor conference in Cardiff, Wales.
MEMS Accelerometer Offers Movement-Activated Features For Mobile Applications
STMicroelectronics’ LIS302DLH, a three-axis digital micro-electro-mechanical-systems (MEMS) accelerometer, is a 16-bit device measuring 0.75 mm high. According to ST, the product partakes in its Piccolo MEMS family’s 3- by 5-mm footprint and therefore is suitable for space-saving designs.
Stepper Motor Controllers Target Bipolar, Unipolar Motors
The LS8297, LS8297CT, and LS8397 stepper motor-controller ICs from LSI Computer Systems Inc. are designed to replace the L297 in all applications while providing additional features. They offer half-step and full-step sequences in both normal drive and wave-drive modes similar to the L297.
Low-Power Op Amps Combine High Performance And Low Noise
Designed for power- and space-constrained applications, the MAX9943 and MAX9944 high-voltage operational amplifiers from Maxim Integrated Products deliver superior precision in sensor signal conditioning, high-performance industrial instrumentation, and loop-powered systems, according to the company. Also, Maxim’s MAX9945 suits portable medical and industrial applications that require low-noise analog front ends.
1.5-V Op Amps Support Portable Products
The TSV6xx families of precision operational amplifiers from STMicroelectronics are designed for low-power and portable products with power-saving features like high-speed performance at low supply current, operation from a 1.5-V supply, and device-shutdown capability.
What's Next For Programmable Devices?
Engineers seldom have to design with discrete components anymore. Integrated ADCs, DACs, high-speed amplifiers, and switch capacitor ICs are now readily available. The most truly amazing advances, however, have been in digital design. The shortage of logic chip designers and the expense of design has led to development along two different avenues: microprocessors and programmable logic. Now, though, these avenues are merging.
Low-Power DAC Family Provides Internal Reference For Industrial Apps
The 16-bit DAC8568, 14-bit DAC8168, and 12-bit DAC7568 digital-to-analog converters (DACs) from Texas Instruments target data-acquisition systems, industrial process control, and portable instrumentation. Their internal reference provides temperature drift performance of 2 ppm/°C (typical) up to 5 ppm/°C (maximum) across the entire operating range for twice the accuracy of competitive devices, according to TI.
Chip, Transistor Demand Returns As Pricing Stabilizes
Conditions in the global market for analog semiconductors and transistors are stabilizing due to rising demand and slowing price erosion, though real industry recovery is still far away, according to iSuppli Corp. “Analog semiconductor and transistor suppliers are reporting that demand now has returned after a virtual halt in new orders in the fourth quarter of 2008 and first quarter of 2009,” said Marijana Vukicevic, senior analyst for power management at iSuppli.
Logic-Level Trench MOSFETs Deliver Benchmark Efficiency
International Rectifier has announced a range of logic-level gate drive trench HEXFET power MOSFETs that provide benchmark on-state resistance and a high package current rating for high-power dc motors and power tools, industrial batteries, and power-supply applications, according to the company.
Resonant Controller Simplifies Design For Apps Up To 600 W
The FAN7621 resonant controller from Fairchild Semiconductor simplifies design, reduces bill of materials, and provides advanced protection functions, according to the company. It integrates a high-side gate-drive circuit, a current-controlled oscillator, a frequency-limit circuit, soft start, and numerous protection functions in a 16-pin small-outline package/dual-inline package (SOP/DIP) package.
14-Bit ADC Provides 250-Msample/s Speeds
The 14-bit ADS62P49 ADC from Texas Instruments operates at 250 Msamples/s with a 73-dBFS SNR and 85-dBc SFDR at an input frequency of 60 MHz. According to TI, that’s the industry’s fastest sample rate, with increased signal bandwidth without compromising range and sensitivity in communications and defense imaging systems or accuracy in wide-band test and measurement equipment.
SDI Cable Equalizer Simplifies Hardware Design
The 3-Gbit/s LMH0384 SDI EQ from National Semiconductor simplifies the design of broadcast video routers, production switchers, distribution amplifiers, and editing and conversion equipment, according to the company. National Semiconductor also says that the device provides the industry’s lowest output alignment jitter along cable lengths, giving hardware designers more headroom for designing within system jitter budgets.
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