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Volume 50 — August 2016

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Application Notes

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Clock and Timing

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Interface and Isolation

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Analog Dialogue--Since 1967

Feature Articles: Products, Applications, Technology, Design Ideas, Tutorials, and Measurement Techniques

 

A Note from the Editor

 

Interleave

Integrated Capacitive PGAs in ADCs: Redefining Performance

For many applications, capacitive programmable gain amplifiers (PGAs) offer better performance than traditional resistive PGAs. For instance, they provide higher common-mode voltage rejection of analog input signals which is important in sensor applications. This article describes how a chopped capacitive amplifier operates and highlights the benefits of this architecture when a small signal from the sensor needs to be amplified close to the rails. Application examples analyzed include temperature measurement (RTDs or thermocouples) and Wheatstone bridges.

Interleave

Crossing a New Frontier of Multiband Receivers with Gigasample ADCs—Part One

Backhaul service providers who must respond to market demands for faster data rates and cheaper services, are confronted with a dichotomous situation: faster data rates mean more bandwidth, which requires faster processing and increased system costs. The solution lies in RF sampling ADCs which integrate custom digital processing blocks to lower data rates, enabling the use of lower-cost FPGAs as processors. This article will discuss a use case for a multiband radio receiver design for TDD LTE bands 34 and 39, based on the AD9680 RF ADC.

Choosing a Precision Op Amp? Trust Goldilocks

I’m selecting an op amp for my precision signal path. Isn’t faster always better?

 

Interleave

What’s Up With Digital Downconverters – Part 1

Regardless of the end application, whether it is communications, aerospace/defense, or instrumentation, the frequencies of interest are pushing higher into the RF and microwave spectrum. Many current radio receiver architectures contain analog down conversion stages that translate an RF or microwave frequency band down to an intermediate frequency for baseband processing. This article explains how the new generation of RF ADCs with an integrated Digital Down Conversion function, eliminates the need for analog down conversion stages and allows the spectrum in the RF frequency domain to be directly converted down to baseband for processing.

New RF DAC Broadens Software-Defined Radio Horizon

On the transmitter side of a communications system, a new class of high-speed digital-to-analog converter, called an RF DAC, has the ability to directly synthesize RF signals without a conventional analog up conversion analog radio chain. In conjunction with the JESD204B high speed serial interface that enables practical management and transfer of output data, RF DACs enable conventional radio designs to be made more efficient than with previous generations of RF class or IF-class DACs. This article explores in detail ADI’s new RF DAC architecture, applications, and performance.

murphy

Going Full Tilt

I would like to improve the accuracy and repeatability of tilt measurements using the ADIS16209 inclinometer. Can I use several of these sensors in parallel to improve the accuracy?

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Analog Dialogue is the technical magazine of Analog Devices. It discusses products, applications, technology, and techniques for analog, digital and mixed-signal processing.

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