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Analog Dialogue is a free technical magazine published by ADI and has been published monthly since 1967, the year after the company was founded.

The new Chinese version (Volume 52, Issue 4) is out, >> [ Click to download the electronic version]

Summary of this issue:

Using Integrated Passives in Micromodule SIPs

When independent discrete passive components or integrated passive networks are used in designs as part of a chipset, routing parasitics, component compatibility, and board assembly still need to be carefully considered to achieve design management. Although integrated passive components continue to occupy an important position in the industry, their most important value can only be achieved when they are integrated into system-level package (SIP) applications, and there are many advantages to doing so.

High-precision, fast-settling, high-current source

Voltage controlled current sources (VCCS) are widely used in many fields. The DC accuracy, AC performance, and drive capability of VCCS are critical in these applications. This article analyzes the limitations of the enhanced Howland current source (EHCS) circuit and explains how to improve it using a composite amplifier topology to achieve a high-precision, fast-settling ±500 mA current source.

Modeling and Control of a Current-Mode Buck Converter with a Secondary LC Filter

Modern signal processing system designs utilizing ADCs, PLLs, and RF transceivers often require lower power consumption and higher system performance.

Powering the ADC or PLL directly is a common problem for system designers. Traditionally, LDO regulators are often used to power noise-sensitive devices. Switching regulators are more efficient than LDO regulators, but they are too noisy to directly power ADCs or PLLs.

Rarely Asked Questions - Issue 158: Driving Unipolar Gate Drivers with a Bipolar Approach

Most of the isolated gate drivers available today only accept a single supply on the output side. In order to achieve better performance, more and more power devices require a negative gate drive voltage to be generated on the gate. This RAQ article details some good ways to use single supply gate drivers in a bipolar approach.

Over-the-Air (OTA) Updates in Embedded Microcontroller Applications: Design Trade-offs and Lessons Learned

While many people are familiar with over-the-air updates on mobile devices, they may not be familiar with the design and implementation of OTA updates for embedded systems. This article will discuss several and the pros and cons that come with various design decisions.
Functional Safety in Data Acquisition Systems
The requirements for functional safety in systems have grown significantly in recent years. From nuclear power plants to medical equipment, trouble-free systems have become a desirable option for some applications and a necessity for others. ADI seeks to address this issue for our customers through the IC-level safety design of the AD7768.

FPGA power supply "care and feeding": the way and reason for success

Modern FPGAs are among the most complex integrated circuits ever created. This means that with each FPGA generation, the FPGA power supply must be more precise, flexible, controllable,
efficient and fault-aware, while also being smaller. This article will specifically discuss some of the constraints on the Altera Arria 10 FPGA and how these specifications affect the power supply design challenges.

Rarely Asked Questions—Issue 159: If the Ground Plane is Split

How to use a switching regulator with an analog ground plane (AGND) and a power ground plane (PGND)? Some developers are used to dealing with digital ground planes and analog ground planes;
however , their experience often fails when it comes to the power ground plane. Designers often copy the board layout of the selected switching regulator and no longer think about the problem.

Programmable Gain Instrumentation Amplifiers: Find the Best Amplifier for YouData
acquisition systems are used in many industries, such as research, analysis, design verification, manufacturing, and test. These systems interface with a variety of sensors, which creates front-end design challenges. We will discuss various integrated PGIAs and the advantages of using them, such as best CMRR, low offset, and excellent gain and drift performance.

Remote Sensing Using a Precision Instrumentation Amplifier

Instrumentation amplifiers are important components for sensing applications. This article explores some ways to take advantage of the amplifier’s balanced nature and excellent DC/low frequency common-mode rejection (CMR) performance. These amplifiers can be used with resistive sensors, such as strain gauges, when the sensor is physically separated from the amplifier.

Overcoming Limitations: Designing a Precision Bipolar Power Supply Based on a Simple Buck Controller

Industrial, automotive, and networking companies use a variety of DC/DC converter topologies, using different types of buck, boost, and SEPIC structures. Obviously, to reduce development costs
, a controller that has been approved and verified for multiple topologies should be used. This article shows how to use this buck controller to generate negative voltages and positive outputs that are not affected by input voltage drops and spikes.

Rarely Asked Questions - Issue 160: Simple circuit measures relative intensity of two light sources

Can you measure differential signals with an instrumentation amplifier? That’s this month’s RAQ question. In many lighting applications, measuring the relative intensity of two light sources is more important .