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Antenna and EM Modeling with MatlabBy Sergey N. Makarov
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Fourier Transforms in Radar and Signal ProcessingBy David Brandwood
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Digital Signal Processing: A Computer-Based ApproachBy Sanjit K Mitra
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Signal Analysis : Time, Frequency, Scale, and StructureBy Ronald L. Allen Duncan Mills
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Understanding Digital Signal ProcessingBy Richard G. Lyons
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Digital Signal Processing: DSP and ApplicationsBy Dag Stranneby
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Introduction to Digital Signal Processing and Filter DesignBy B. A. Shenoi
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Signal Processing and Linear Systems, 2000-02By B. P. Lathi
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Signals and SystemsBy Bernd Girod
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High-Fidelity Circuit Design.By Norman, & George Cooper, Crowhurst
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Electrical Circuit Theory and Technology : Revised editionBy John Bird
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Coombs' Printed Circuits HandbookBy Clyde F. Coombs
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The Art of ElectronicsBy Paul Horowitz
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Digital Switching Systems: System Reliability and AnalysisBy Syed Riffat Ali
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Verilog HDL (2nd Edition)By Samir Palnitkar
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Principles and Applications of Electrical EngineeringBy Giorgio Rizzoni
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SPICE for Power Electronics and Electric Power, Second Edition
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Monday, April 28, 2008
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Wednesday, February 13, 2008
Circuit Protection from Transient Voltage by Varistor
Differential and Common Mode Noise
- Suppression circuit of differential mode noise
- Suppression circuit of common mode noise
- Noise Suppression by Common Mode Choke Coils
Common mode choke coils are used to suppress
common mode noise. This type of coil is produced by
winding the signal or supply wires one ferrite core.
Circuit Protection from Transient Voltage by Varistor
- Circuit Transient Voltage by Varistor
- Characteristic of Varistor
Varistor device datasheet
EPCOS varistor
Crimp style. Taping mode. Max. AC operating voltage.
Tolerance of varistor voltage. EPCOS metal oxide varistor.
Leaded Varistors. StandarD Series
Electronic Enclosures EMC shielding
Use Shielded Electronic Enclosures To Meet
EMC Standards
Proper selection of shielding options early in the design cycle
ensures electromagnetic compatibility without sacrificing other
objectives.
Knowledge of shielding options and how to implement them
into initial product designs is vital to producing an electronic
packaging product that satisfies several important design
objectives. A properly applied shielding solution will meet
standards for electromagnetic compatibility (EMC), as well as
cost restrictions and the specific needs of high-power and
high-speed electronics.
Selecting magnetic shielding metals
High-permeability shielding material prevent interference from
driving sensitive circuits crazy
Shielding Strategies for Today's Electronic Enclosures
For as long as electronics have been around, enclosure engineers
have seen their role in the EMC design process as the clean-up
crew. Whatever design engineers could not solve with tricks of the
trade was left to them to handle. Unfortunately, this practice
continues, and an often-repeated process of trial and error to
contain electromagnetic interference shows up more often than
not in the testing phase.
Electronic Enclosures shielding
Effective EMI control prevents spurious signals from entering
or leaving an enclosure. Shields and filters are the predominant
techniques for controlling EMI.Shields can involve many
combinations of foils, conductive inks, paper, and adhesives.
For example, there are now shields that consist of silver ink
printed on 5-mil-thick polyester. After printing, a curing process
removes nonconductive solvents. The result is a homogeneous
shield that does not crack or delaminate when bent. The shield
can be mechanically fastened and grounded with solder tabs.
The cost is about the same as that for conventional laminated
designs.
EMC Filter Device
EMC Filter Device
TGL Technology Co., Ltd.
Main Products: Manufacturers & Suppliers of EMI core,
EMC core, EMI Filter, EMI filters, EMI suppression, EMI
shielding
Belling Lee EMC Mains Filters
With the continuing development of electronics and its
applications into most areas of human activity it is important
to recognise the increasing danger of reducing the reliability
of equipment through electromagnetic interference.
Unplanned coupling of spurious signals into equipment can
cause inadvertent initiation of sequences leading to
unplanned events and happenings which can lead to
corruption of data, loss of revenue and danger to life.
GENERAL PURPOSE FILTERS
These general purpose filters provide adequate attenuation
for the suppression and protection of most machines,
and are available in current ratings up to 100 amps three
phase four lines.
EMI/EMC Suppression in Audio/Video Interfaces
All electronic products marketed worldwide undergo EMI/EMC
(electromagnetic interference/electromagnetic compatibility)
testing before they are offered for sale to prove that they will
not create interference, or be interfered with by other devices.
For testing purposes, products are grouped into two classes:
intentional radiators and unintentional radiators. For example,
cell phones and walkie-talkies intentionally radiate energy while
TVs, PCs, or laptops should not.
EMC Filters
Schaffner is uniquely able to offer the world's most compre
hensive ranges of EMC filters, RFI suppression chokes, line
conditioning and power quality products, feedthrough
components, pulse transformers and automotive solutions.
Products PCB Filters, IEC Inlet Filters, Single Phase Filters,
Three Phase Filters, Three Phase + Neutral Line Filters,
Open Frame Filters
Microcomputer Grounds in One- and Two-Layer PCB Design
A microcomputer ground is a ground area on the bottom
layer underneath the microcomputer that becomes a ground
island for the noise made by the microcomputer.
This area should extend about 1/4 inch outside the outline
of the device and tie to the microprocessor ground. Ground
connections for the power-supply bypassing capacitors and
any bypassing capacitors on the pins also should tie to this
ground. Additionally, the ground area should extend out and
around the through holes for the oscillator leads, and the
bypass capacitors tied in to provide the smallest possible loop
area when viewed from the top.
The topside traces are shown in dotted line form on the bottom
side diagram for alignment purposes. Notice how the oscillator
capacitors lay back over the traces between the device and the
crystal. This eliminates loop area. The same is true for the
placement of the ferrite bead and Vcc bypass capacitor, being
centrally located with the main power lead running almost directly
under the lead finger for the ground.
PCB Design Guidelines For Reduced EMI
Texas Instruments
Electronic Enclosures
Bud Industries Quality electronic enclosures
Bud Industries is the United State's leading manufacturer of
standard electronic enclosures and custom electronic enclosures.
SERPAC ELECTRONIC ENCLOSURES
Top Manufacturer of Electronic Enclosures, Plastic Instrument
Cases, Project Boxes, and Enclosures
Electronic Enclosures
This enclosure consists of high-impact ABS (operating
temperature : -4°F to +212°F).The lid and the base equipped
with a tongue and groove
sealing system with a neoprene gasket. The mounting holes
and the lid-fixing screws are outside the seal, which prevents
moisture and dust from entering the enclosure. Internal
guide slots allow the vertical mounting of PCB assemblies.
Designed to meet IP65 of IEC529 and NAMA4 (dust- and
hose proof).
The bosses on the internal base allow the horizontal fixing
of PCBs or the connection of terminals, etc. with threaded
brass inserts.
ELBAG ELECTRONIC BOX
modular housing,Vertical rail mounting, Power Box , Cases
for potted circuit , housing with socket , custom housing ,
panel housing
Plastic Enclosures and Electrical Connector Enclosures
PacTec has designed and manufactured plastic electronic
enclosures since 1978. Search our extensive plastic enclosure
database to find the plastic boxes that will house your PCB.
RMS to dc Circuit
Circuit measures true-rms and average value
The circuit measures both the true-rms value and the
rectified average value of an ac signal.This design uses
two low-cost ICs
Operating from a single 5V supply, the circuit has an
input dynamic range of less than 30 mV to greater than 3V rms.
RMS-to-dc converter Circuit is accurate and stable
The circuit uses a low-cost analog multiplier, IC1; an
integrator, IC3A, R5, and C1; and an analog inverter, IC2, R3, R4,
and D1 to convert the analog VIN into a true-rms dc VOUT.
The input signal can be ac, dc, or a combination. With an
input-signal range of 0 to 2V, the circuit can handle ac signals
with crest factors up to 5
True RMS Detector Circuit
The op amp precision rectifier circuits have greatly eased
The problems of AC to DC conversion. It is possible to measure
millivolt AC signal with a DC meter with better than 1%
accuracy. Inaccuracy due to diode turn-on and nonlinearity is
eliminated, and precise rectification of low level signals isobtained
Extend RMS-To-DC Converter's Range
The AD736 rms-to-dc converter is a 1-V, full-scale device.
Voltage comparator IC3 can increase the full-scale input range to
10 V automatically. When the rms-to-dc operating range is exceeded
, the comparator's hysteresis switches in an attenuator at the
rms-to-dc converter's input. Concurrently, it adds a gain stage to
the circuit's output-buffer amplifier, maintaining a steady output
voltage.
RMS-to-DC converter circuit
LTC1966
Precision Micropower,RMS-to-DC Converter
The LTC1966 is a true RMS-to-DC converter that utilizes
an innovative patented computational technique. The
internal delta-sigma circuitry of the LTC1966 makes it simpler
to use, more accurate, lower power and dramatically
more flexible than conventional log-antilog RMS-to-DC
converters. 
Instrumentation Circuitry Using RMS-to-DC Converters
True RMS-to-DC IC
MX536A and MX636
Maxim-IC
The MX536A and MX636 are true RMS-to-DC converters.
They feature low power and are designed to accept
low-level input signals from 0 to 7VRMS for the MX536A
and 0 to 200mVRMS for the MX636. Both devices accept
complex input waveforms containing AC and DC components.
They can be operated from either a single supply
or dual supplies. Both devices draw less than 1mA
of quiescent supply current, making them ideal for battery-
powered applications.
Feature
- True RMS-to-DC Conversion
- Computes RMS of AC and DC Signals
- Wide Response:
2MHz Bandwidth for VRMS > 1V (MX536A)
1MHz Bandwidth for VRMS > 100mV
- Auxiliary dB Output: 60dB Range (MX536A)
50dB Range (MX636)
- Single- or Dual-Supply Operation
- Low Power: 1.2mA typ (MX536A)
800μA typ (MX636)
Mx536,MX636 datasheet pdf
True RMS-to-DC Converter
AD736
Analog Devices, Inc.
The AD736 is a low power, precision, monolithic true rms-to-dc
converter. It is laser trimmed to provide a maximum error of
0.3 mV 0.3% of reading with sine wave inputs. Furthermore,
it maintains high accuracy while measuring a wide range of
input waveforms, including variable duty cycle pulses and triac
(phase) controlled sine waves. 
200 mV full-scale input range (larger inputs with input attenuator)