Introduction

Highlights of this issue include new product releases from Analog Devices, Maxim, Torex and Murata Power Solutions; design features on voltage follower amplifier and signal integrity; analogue-related design ideas; schedule of the ESSCIRC 2009 conference and the European Microwave Integrated Circuits Conference 2009; and research studies on market for data converters.
 

21 July 2009

Ultra-low-noise amp
Analog Devices designed the AD8432 dual ultra-low-noise amplifier for high channel count, wide-bandwidth communications and medical applications. The device features selectable gain and active impedance matching, and provides superior noise performance, lower per-channel cost and nearly three times the bandwidth of comparable products.
Analog Devices


1A LDO regulators
The MAX15027-MAX15030 are low-dropout (LDO) linear regulators capable of delivering up to 1A (MAX15027/MAX15028) or 500mA (MAX15029/MAX15030) while operating from a voltage as low as 1.425V. In a 3mm x 3 mm package, the LDOs can dissipate up to 1.9W at +70C. Maxim designed them for applications in automotive, networking, storage, server, and telecom equipment.
Maxim


Li-ion battery linear charger IC
Torex has unveiled the XC6802 series of linear charger ICs for single cell lithium-ion batteries. The series includes a reference voltage source, battery voltage monitor, driver transistor, constant-current/constant-voltage charge circuit, over heat protection circuit and phase compensation circuit.
Torex


Quad sampling ADC feature improved dynamic performance
Murata Power Solutions has introduced a new quad sampling ADC (analogue-to-digital converter) for image processing applications where low noise performance and the ability to convert full-scale step input signals at a 10MHz conversion rate is required. The ADSQ-1410 is a functionally complete, quad 14bit resolution, 10Msamples/s converter. Murata Power Solutions
 

Eliminate Sallen-Key Stopband Leakage With A Voltage Follower
The Sallen-Key lowpass filter is a form of the VCVS (voltage-controlled voltage-source) topology. Unfortunately, the interaction of the op-amp output impedance with the filter input degrades stopband performance (Figure 1). If the output impedance of the amplifier were zero, the stopband would continue to drop indefinitely with increasing frequency. This behavior corresponds to the ideal stopband response.

Signal Integrity: Take care with programmable pre-emphasis
The capability to adjust pre-emphasis levels in serial-data streams is becoming universal; but you need to be careful, or it can do more harm than good. Last time, in this column, I discussed the need to maintain fast edge rates, especially in the new LVDS (low-voltage differential-signal) serial buses. Going back to basics and applying Fourier analysis, I recalled that a fast edge is composed of a series of high-frequency sinusoidal-signal components.
 

Two instrumentation amps make accurate voltage-to-current source
Many designs require precise voltage-controlled current sources, especially in the presence of variable loads. Common approaches, which use a few op amps and a handful of passive components, have inherent errors due to non-ideal component characteristics, such as finite open-loop gain, common-mode rejection, bias current, and offset voltage. Designs using operational amplifiers may require precision resistors to set gain and additional capacitors for stability.

Use an LED to sense and emit light
LEDs in portable devices often show power status, battery status, or Bluetooth-connection activity. LEDs can be major factors in determining battery life because their intensity is directly proportional to power drain. Using a simple circuit, the MAX IIZ CPLD from Altera (www.altera.com) can measure the analog-light level of its environment and then drive an LED at a proportional analog intensity level. A single LED can both sense and emit light with the same LED and bias resistor.


 

ESSCIRC 2009, 14-18 September 2009, Athens, Greece
The aim of the ESSCIRC conference is to provide an annual European forum for the presentation and discussion of recent advances in solid-state circuits. The main themes for original contributions to be submitted to ESSCIRC 2009 include: Analog Circuits, Data Concerters, RF Circuits and Devices, Sensors, Imagers, MEMS, Bioelectonic Integration, Digital and Memory Circuits and High Speed Interfaces.

The European Microwave Integrated Circuits Conference 2009 (Formerly GAAS), 28- 29 September, Rome, Italy
EuMIC is a conference for MMICs/RFICs and their applications in Europe, conducted with the aim of promoting the discussion of recent developments and trends, and encouraging the exchange of scientific and technical information on physical fundamentals, material technology, and process development and technology, amongst others.

 

Data Converters Market Report
Over the long term, data converters consumption and revenue growth will be driven by the industrial, communications, and consumer electronics markets primarily, with demand from Asia Pacific manufacturing continuing to accelerate; the recent downturn experienced for data converters is due to the macro factors affecting the global economies and technology markets.
 

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