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Today in Science History

Solid-State Scene: IC Comparators and Op Amps

Solid-State Scene: IC Comparators and Op Amps, May 1973 Popular Electronics - RF CafeIt is hard to imagine a time when integrated circuit (IC) comparators were a big deal, but as recently as 1973 when this article appeared in Popular Electronics, they were new to a designer's bag of tricks. Prior to an IC solution, comparators needed to be constructed from opamps and a handful of peripheral biasing components. As with other integrated circuits, not only does the overall price go down, but so does circuit board real estate, cost, temperature variability, and electrical parameter variance between devices. The first comparator circuit I remember designing was a temperature sensor that went in an oven used for curing the potting ...

Bluetooth Low-Energy Transceiver Slashes Consumption by over ½

Bluetooth Low-Energy Transceiver Slashes Consumption by over ½ - RF Cafe"Researchers at Tokyo Institute of Technology have announced a Bluetooth Low-Energy transceiver with the lowest ever power consumption, designed for use in the popular 2.4 GHz band. The breakthrough set to accelerate widespread adoption of Internet of Things (IoT) applications was developed by a group of researchers led by Kenichi Okada of Tokyo Institute of Technology, Japan. When transmitting, the transceiver consumes 2.9 milliwatts (mW) and when receiving, it consumes ..."

The Electronics Handbook, Second Edition

The Electronics Handbook, Second Edition - RF CafeSometimes it's still nice to have a hard copy reference book on hand rather than clicking through a PDF file. This 2640-page, 2nd edition of The Electronics Handbook, published by CRC, is such a book. Peruse the "Look Inside" page samples and you will see it is like a compilation of undergraduate textbooks plus table, charts, and graphs chock full of data. Analog, digital, RF and electric power topics are included. Check it out ...

Variable-Capacitance Diodes

Variable-Capacitance Diodes, July 1969 Electronics World - RF CafeIt appears that maybe Abraham Lincoln had a son who was an electrical engineer working at Motorola Semiconductor back in the 1960's. Put glasses on Honest Abe (I did) and author Irwin Carroll's a spitting image of the Great Emancipator. Seriously though, this article is a great introduction to the fabrication and use of variable capacitance (aka varicap and varactor) diodes. They have been - and still are - used widely for electrically tunable oscillator and filter circuits. Topics such as temperature and figure of merit ("Q") are discussed as well. This edition of Electronics World ran a series ...

How Douglas Engelbart Invented the Future

How Douglas Engelbart Invented the Future - RF CafeThis article on computer mouse inventor Douglas Engelbart appeared in the January 2018 issue of Smithsonian magazine. I like the opening paragraph by author Valarie Landau, who happened upon a 1968 film while researching for a documentary. "On December 8, 1968, Douglas Engelbart sat in front of a crowd of 1,000 in San Francisco, ready to introduce networked computing to the world. Engelbart was no Steve Jobs. He was a shy engineer with no marketing background. His goal was to speak directly to other engineers, showing them that they could use computers in new ways to solve complex ..."

Gowanda Intros Shielded Surface Mount RF Inductors w/Higher Inductance

Gowanda Electronics Intros Shielded Surface Mount RF Inductors with Higher Inductance - RF CafeGowanda Electronics, a designer and manufacturer of precision electronic components for radio frequency and power applications, announces the expansion of its SML32S series of wirewound, shielded, molded RF surface mount inductors in the "1210" style. This expansion increases the number of individual parts in the series by more than 20% and broadens the inductance range by adding values from 120 µH to 470 µH. The expansion was done in order to address the market need for higher inductance shielded inductors in RF applications ...

Bliley Oscillators Featured in Erie's Local Newspaper

Bliley Oscillators Featured in Erie's Local Newspaper - RF CafeBliley Technologies has been manufacturing oscillators and crystals in Erie, Pennsylvania, since 1930. That's pretty amazing. Bliley's 64,000 square foot facility is only a few miles from my home. The Erie Times-News published a feature article on them in today's edition that has some photos from inside the plant. Note the stack of vintage-looking test equipment on the benches in the background (high-res). Despite its rather run-down appearance, Erie and the surrounding area is home a lot of high-tech industries including plastics, electronics, metal plating, industrial electrical equipment, and medical paraphernalia. The crime and cost of living are low here ...

Church Spires to Boost Mobile Connections

Church Spires to Boost Mobile Connections - RF cafe"Church spires across the UK will be used to boost digital connectivity in rural areas following an agreement between the Government and the Church of England. The accord, signed by the the National Church Institutions (NCIs) of the Church of England, the Department for Digital, Culture, Media and Sport (DCMS) and the Department for the Environment, Food and Rural Affairs (Defra) encourages the Church of England to use its buildings and other property to improve broadband, mobile and WiFi connectivity for local ..."

ISSCC: 80 GHz Automotive Radar on One Chip

ISSCC: 80 GHz Automotive Radar on One Chip - RF cafe"Texas Instruments said 'yes' in an ISSCC paper devoted to a single-chip 76-81 GHz frequency-modulated continuous wave (FMCW) radar transceiver in 45 nm CMOS, which includes three transmitters, and four receivers with integrated ADCs. To support system-level functional safety, the design also features autonomous fault monitoring of the RF chain. The fast-chirp FMCW signal is generated in a closed-loop 19-20.25 GHz fractional-N frequency synthesizer, fed from a high frequency reference clock via ..."

BeRex Fast Switching, High Isolation, SPDT Switch for Wi-Fi, CATV, IoT, 5G

BeRex Intros BSW7221 Fast Switching, High Isolation, Reflective SPDT Switch for Wi-Fi, CATV, IoT and 5G Applications - RF CafeBeRex continues to expand its family of RF switches by announcing the availability of the BSW7221, a high isolation, SPDT RF switch with high linearity, low insertion loss, and a very fast, 90 to 135 ns, switching time making it ideal for demanding wireless switching applications such as Wi-Fi, CATV IoT and 5G applications. Using a single 2.7 to 3.6 V supply voltage, the BSW7221 switch provides a wide 1 to 6000 MHz frequency range ...

How Chrome Ad Blocking is Already Changing the Web

How Chrome Ad Blocking is Already Changing the Web - RF CafeIt's getting harder for companies to have their online advertisements seen by potential customers thanks to the popularity of ad blockers. Now, Google is building the ability into its own browser. "Google's browser doesn't go as far as full-on ad blockers and won't always stop ad trackers. But already it's cut ads on 42% of websites it's tangled with. What was once unthinkable - that Chrome would block online ads, Google's lifeblood - becomes reality on Thursday. That's when Chrome takes a significant step in the direction that hundreds of millions of us already have gone by installing ad blockers. Chrome stops far ..."

Washington's Birthday, Not Presidents Day

Washington's Birthday, Not Presidents Day - RF cafeDid you think that holiday celebrated on the 3rd Monday in February is "Presidents Day?" I assumed so given the prevalence of "Presidents Day." Well, it maybe so for some states, but the Office of Personnel Management's calendar still lists it as "Washington's Birthday." The White House put out a story about it on Monday. Better late than never.

Southwest Antennas Tri-Band Omni-Directional Antennas for L, S, C Band

Southwest Antennas Releases New Rugged Tri-Band Omni-Directional Antennas for L, S, and C Band Communication - RF CafeSouthwest Antennas, an industry leader in rugged RF / Microwave antenna and accessory products, has released a new line of tri-band antenna solutions designed to cover several popular sub-bands across the L, S, and C Bands. These omni-directional antennas are tuned for high performance operation in the following frequencies: 1.70 - 1.85, 2.2 - 2.5, and 4.4 - 5.0 GHz. For users who expect to utilize these bands or deploy multi-band radio systems, tri-band antennas can ...

FCC Suggested Changes to CBRS Band Rules Could Hinder Progress

FCC Suggested Changes to CBRS Band Rules Could Hinder Progress - RF Cafe"The Dynamic Spectrum Alliance (DSA) has approached the Federal Communications Commission (FCC) regarding its discontent over the proposed changes in the CBRS band rules. According to the DSA, the changes to the Priority Access License (PAL) and other rules, first requested by petitioners and now proposed by the Commission, are both unnecessary and counterproductive to enabling the fullest use of the Citizens Broadband Radio Service (CBRS) band. In its NPRM, the FCC proposed changes which included increasing the length of license terms from three ..."

ConductRF Low PIM RF Cables for DAS and Cellular

ConductRF Low PIM RF Cables for DAS and Cellular - RF CafeConductRF provides 3 styles of solution for DAS applications in Stadiums, Malls, Campuses, Hotels and more. Straight & R/A Low PIM Connectors are available for 7/16, N, SMA, QMA, 4.1/9.5 and 4.3/10 interfaces. We also offer Low PIM Adapters and PIM Test Cables for all these series. Utilizing ConductRF's new Low PIM Direct Solder Attachment Connectors, we provide high performance solutions for Low PIM interconnect including Straight, Right Angle, Bulkhead and Panel attachment. Performance better than -155dBc is validated through 100% testing ...

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

U.S. National Science Foundation Clamps down on Misconduct

Netherlands Planning Massive Solar Energy Farm at Sea

Rise of Tech Giants May Be Bad News for Economy

Heaviest Element Could Have Fascinating Atomic and Nuclear Spectra

FCC Releases Report on Internet Access Services

Employees at Apple's New Campus Are Walking into the Glass Panes

Qualcomm Offers Previews of Its 5G Chipsets, Services

FY19 Defense Budget Calls for Big Boost for DIUx

Precision Experiments Reveal Gaps in van der Waals Theory

Anatech Electronics Newsletter for February 2018

Anatech Electronics Newsletter for February 2018 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its February newsletter. In it, Sam Benzacar writes in "The Magic in Sprint's Magic Box" about how Sprint, which "has always been the Number Four wireless carrier," is surreptitiously catching up because of the widespread distribution of its personal cell extenders. Sam has a lot of insight into the wireless business through decades of keeping his finger on the pulse of the industry, and has written much about it. These monthly newsletters always provide good tidbits you likely won't find elsewhere ...

Fastest Electronic Device: Josephson Junction

Josephson Junction - Fastest Electronic Device, May 1973 Popular Electronics - RF CafeThe Josephson effect was predicted in 1962 by British physicist Brian David Josephson. It postulated the possibility of a resistance-less path for electrical current across an extremely thin insulator sandwiched between two superconductors. Dr. Juri Matisoo, of IBM, is credited with building the first Josephson junction switch in 1967, demonstrating sub-nanosecond switching times. Back in the day, superconducting materials, like graphene, were resources available only to well-funded research establishments like major corporations, universities, and government facilities. Now, anyone with an interest can order both ...

Bluetooth, in Its Prime, Turns 20

Bluetooth, in Its Prime, Turns 20 - RF Cafe"Back in 1998, who would've predicted the wireless technology's current ubiquitousness? Can you believe it? Bluetooth is 20 years old. My, my, how time flies. Who would have thought back in 1998 that this nascent technology would become an important part of our lives? Today BT is everywhere. Go ahead and count up the number of BT radios you use every day. Be amazed. Taking inventory, I determined today that I must own about a half-dozen BT radios. It appears in our smartphones, our hands-free ..."

eCall Conformance Testing Application Note

eCall Conformance Testing Application Note - RF CafeRohde & Schwarz has published this application note on eCall. "Emergency Call (eCall) is a service provided in Europe with the goal of reducing response times for acci- dents or other emergencies on the roadways. This application note briefly describes the technology behind eCall and presents conformance tests for eCall using the R&S ® CMW500 RF tester and the R&S ® SMBV100A vector signal generator. A Test software for eCall makes it quick and easy to perform these tests with the GSM or WCDMA wireless communications standard. It also shows a test solution for GNSS performance tests for eCall using ..."

RIGOL Announces New RSA5000 Real-Time Spectrum Analyzer

RIGOL Announces New RSA5000 Real-Time Spectrum Analyzer - RF CafeRIGOL Technologies announces a significant addition to its portfolio of RF Test Instrumentation with the introduction of the New RSA5000 Real-Time Spectrum Analyzer. The RSA5000 combines the power of a high performance swept spectrum analyzer with superior Real-time performance unmatched in this product category. Available in 3.2 GHz and 6.5 GHz models all RSA5000 Series Analyzers provide Resolution Bandwidth (RBW) down to 1 Hz, a noise floor as low as ...

KR Electronics Intros 1208 MHz Surface Mount Lowpass Filter

KR Electronics Intros 1208 MHz Surface Mount Lowpass Filter - RF CafeKR Electronics has released part number 3337+, which is a 1208 MHz lowpass filter. The filter is a selective elliptic type filter. The stopband starts at 1292 MHz and is maintained to >6 GHz. The filter is supplied in a miniature surface mount package measuring 0.20" x 0.30" x 0.18". Other frequencies and bandwidths are available. Data sheets are available ...

Grounding and Bonding for the Radio Amateur

Grounding and Bonding for the Radio Amateur - RF CafeOn many occasions in both the lab and on installed equipment I have run into "unexplainable" problems of signal leakage and/or crosstalk that ended up being poor ground issues. Ground loops can be particularly frustrating. This new book written by the highly experienced and regarded H. Ward Silver, with degrees from both universities and The School of Hard Knocks, will be a valuable resource for your own situations. A mere $23 investment could be invaluable ...

Author: Kirt Blattenberger on Google+ Author:
Kirt Blattenberger