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  • Complementary SiGe BiCMOS Facilitates Precision High-Speed Analog

    By Ashok Bindra, August 05, 2002

    To extend its BiCOM biCMOS process into the next generation, Texas Instruments is tapping the benefits of complementary silicon-germanium (SiGe) bipolar transistors. TI has developed a third generation of fully isolated complementary SiGe biCMOS, or...

  • Reconfgurable Architectures Chart A New Course For DSPs

    By Ashok Bindra, August 05, 2002

    Ever-increasing computational complexity and evolving wireless and consumer standards are forcing developers of monolithic digital signal processing (DSP) chips to look beyond the traditional fixed architectures that have served the industry...

  • Mixed-Signal IC Merges 14-Bit ADC With DSP In 0.18-μm CMOS

    By Ashok Bindra, July 22, 2002

    Audio IC supplier Wolfson Microelectronics of the U.K., partnered with Japan's Sanyo, is prepping a mixed-signal device for next-generation automotive entertainment systems. This audio chip will tap advances in the state-of-the-art 0.18-µm CMOS...

  • Power MOSFETs Switch High-Side Load Intelligently

    By Ashok Bindra, July 22, 2002

    Tapping an advanced CMOS process and innovative circuit design, Advanced Analogic Technologies has readied a family of intelligent power control switches for cell phones, PDAs, and other portable consumer electronics. Built around p-channel...

  • High-Bandwidth Analog Switches Set New Performance Levels

    By Ashok Bindra, July 22, 2002

    A line of 5-V analog switches from Siliconix boasts an order-of-magnitude improvement in performance over previous devices. Typical charge injection has been lowered to 1 pC, minimizing glitching and reducing noise, distortion, and leakage for...

  • PWM Motor Driver IC Handles ±1.5-A Continuous Current

    By Ashok Bindra, July 22, 2002

    Designed for pulse-width modulation (PWM) motor control, the A3948 integrates on-chip DMOS output transistors in an H-bridge configuration. Consequently, the motor driver chip can handle continuous currents of ±1.5 A and operating voltages up...

  • Current-Mode Controller Improves Conversion Efficiency

    By Ashok Bindra, July 22, 2002

    The NCP1205 is a pulse-width modulated (PWM) current-mode controller for high-voltage off-line power conversion applications. To cut electromagnetic interference (EMI) and turn-on losses, the NCP1205 operates in a true quasi-resonant (QR) valley...

  • Power-Supply Software Slashes Design Time

    By Ashok Bindra, July 22, 2002

    Version 4.0 of the PIExpert power-supply design software automates the design of single- and multiple-output flyback power supplies using the company's TOPSwitch and TinySwitch families. This PC-based software now offers a more intuitive user...

  • Micropower LDO Is Tailored For Power-Sensitive Systems

    By Ashok Bindra, July 22, 2002

    Consuming only 18 µA of quiescent current, the MIC5233 and MIC5235 are low-dropout (LDO) regulators capable of supplying 100- and 150-mA output currents, respectively. While the MIC5233 supports an input voltage range of 2.3 to 36 V, the...

  • Power MOSFETs Achieve New Low In On-Resistance

    By Ashok Bindra, July 22, 2002

    Three power MOSFETs in tiny six-lead SC-89 packages reach a new low in on-resistance--less than 1 W. The single p-channel Si1039X and Si1037X offer an RDS(ON) of 165 and 195 mW, respectively, at a ­4.5-V gate drive. Incorporating...

  • Hot-Swap Power Controller Eases PCI System Development

    By Ashok Bindra, July 22, 2002

    The TPS2345 integrated hot-swap power controller complies with the PICMG2.1 specifications for the PCI bus. It's designed to gradually power-up inserted PCI boards, detect load failures in PCI plug-in cards, remove power from failed boards, isolate...

  • Multiphase Switching Converters Comply With VRM Specifications

    By Ashok Bindra, July 08, 2002

    For powering next-generation microprocessors and high-end computing systems, Texas Instruments has readied 40-A, multiphase, fully integrated switching regulators. The PT8100 and PT8120 use a two-phase topology to provide a low-voltage,...

  • Dedicated Baseband Processor Breaks New Ground In 3G Designs

    By Ashok Bindra, July 08, 2002

    Greater computational complexity and the rising broadband demands of the evolving third-generation wireless standards are forcing developers to look beyond traditional digital signal processor (DSP) architectures. Since MOPS requirements for these...

  • RF Power Amplifier Serves Quad Cellular Bands For 2.5G Handsets

    By Ashok Bindra, June 24, 2002

    Combining high-impedance integrated power-amplifier (HIIPA) packaging with enhancement-mode (E-mode) gallium-arsenide (GaAs) wafer processing, Motorola's Semiconductor Products Sector has crafted a wideband 50-Ω RF power-amplifier module for 2.5G...

  • CMOS DC-DC Controller Tackles High Voltages

    By Ashok Bindra, June 24, 2002

    Pressure to speed designs to market without compromising reliability and performance isn't the only compelling reason to adopt more integrated voltage converters or controllers in power supplies. The ability to build smaller, lighter, and more...

  • Exotic Materials Squeeze More Juice Out Of RF Power Amplifiers

    By Ashok Bindra, June 24, 2002

    Today's designers face an expanding array of transistor choices for use in RF power amplifiers in cellular communication gadgets and third-generation mobile systems. Gallium-nitride (GaN) high-electron mobility transistors (HEMTs) and...

  • Op Amp Exhibits Low Voltage Noise While Drawing Half The Power

    By Ashok Bindra, June 24, 2002

    Drawing nearly half as much power as previous operational amplifiers, the LT1722/23/24 single/dual/quad high-speed op amps exhibit a low-voltage noise of only 3.8 nV/√Hz at a 3.7-mA supply current. They also offer a 200-MHz gain-bandwidth...

  • Stereo Audio DAC For SACD Players Samples Up To 192 kHz

    By Ashok Bindra, June 24, 2002

    The AD1955 24-bit stereo audio digital-to-analog converter (DAC) is designed for use in high-end super audio CD (SACD) players and a variety of other consumer and professional equipment. Based on a multibit sigma-delta modulator, it provides 123 dB...

  • Op Amp Boosts Slew Rate/Power Ratio By An Order Of Magnitude

    By Ashok Bindra, June 24, 2002

    The MIC920/921 high-speed operational amplifiers provide an order-of-magnitude improvement in the ratio of slew rate to power consumption. Decompensation enables the two devices to achieve a 3000-V/µs slew rate and high gain-bandwidth product...

  • Low-Voltage Analog Switches Offer 19-Ω On-Resistance

    By Ashok Bindra, June 24, 2002

    The ISL5120/21/22/23 low-voltage analog switches boast an on-resistance as as low as 19 Ω, while their switching time is 28 ns for turn-on and 20-ns for turn-off. These 2.7- to 12-V (15-V max) single-supply units are offered as dual-SPST or...