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Wednesday, May 13, 2020

Principles of Semiconductor Devices

The purpose of this text is to explore the internal behavior of semiconductor devices, so that we can understand the relation between the device geometry and material parameters on one hand and the resulting electrical characteristics on the other hand.

Principles of Semiconductor Devices 

The Primary Focus: The MOSFET and CMOS Integrated Circuits The Metal-Oxide-Silicon Field-Effect-Transistor (MOSFET) is the main subject of this text, since it is already the prevailing device in microprocessors and memory circuits.

Principles of Semiconductor Devices

In addition, the MOSFET is increasingly used in areas as diverse as mainframe computers and power electronics. The MOSFET’s advantages over other types of devices are its mature fabrication technology, its successful scaling characteristics and the combination of complementary MOSFETs yielding CMOS circuits.

Topics Include -Schottky diode current, Metal-Semiconductor contacts,Electrostatic analysis of a p-n diode,Reverse bias breakdown, Optoelectronic devices, Light Emitting Diodes (LEDs), Ideal transistor model.

    Saturday, May 09, 2020

    LM3445 - TRIAC dimmable offline LED driver

    Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today's LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming.

    LM3445 - TRIAC dimmable offline LED driver

    The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC . The LM3445 contains all the necessary circuitry to build a line-powered (mains powered) constant current LED driver whose output current can be controlled with a conventional TRIAC dimmer.

    LM3445 - TRIAC dimmable offline LED driver

    Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn ’t turn on until the junction temperature drops to approximately 145°C

    Monday, May 04, 2020

    Plessey Semiconductors - CMOS IC Solutions

    British electronics company which design and develop Semiconductor Chip Solutions like RF components, data converters, power regulators, imaging sensors, programmable DSPs and special ASICS.

    Plessey Semiconductors - CMOS IC Solutions

    Highlights of Services
    • In-house development team
    • RF, Mixed Signal and High Performance Analogue
    • Full custom / Semi-custom IC design service
    • Process design Kits (PDK) Development and Support
    • Characterization, Modelling and ESD

    EPIC Sensor technology

    EPIC Sensor technology

    A innovative  sensor technology that measures changes in an electric field in a similar way to a magnetometer detecting changes in a magnetic field. The EPIC sensor, which requires no physical or resistive contact to make measurements.....

    Plessey Semiconductors Ltd
    Plymouth Tamerton Road, Roborough, Plymouth, Devon, United Kingdom PL6 7BQ.

    Friday, April 10, 2020

    CD4060 Binary Counter Divider Oscillator

    The CD4020BC, CD4060BC are 14-stage ripple carry binary counters, and the CD4040BC is a 12-stage ripple carry binary counter. The counters are advanced one count on the negative transition of each clock pulse. The counters are reset to the zero state by a logical "1" at the reset input independent of clock.

    CD4040BC, 12-Stage Ripple Carry Binary Counters
    CD4060BC, 14-Stage Ripple Carry Binary Counters


    CD4060 - 14-Stage Ripple Carry Binary Counters
    you can also use a crystal between pin 10 and 11 with two caps 22pF from 10, 11 to gnd and a 10M resistor between 10 and 11 in place of R C network for more precision.

    Thursday, April 09, 2020

    TDA5145 Brushless DC motor drive circuit

    TDA5145 is a bipolar integrated circuit used to drive3-phase brushless DC motors in full-wave mode. The device is sensorless (saving of 3 hall-sensors) using the back-EMF sensing technique to sense the rotor position.It includes bidirectional control, brake function and has a special circuit built-in to reduce the EMI (soft switching output stages)

    TDA5145 Brushless DC motor drive circuit

    TDA5145 offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor drive and full-wave drive. The TDA5145 offers protected outputs capable of handling high currents and can be used with star or delta connected motors. It can easily be adapted for different motors and applications.

    TDA5145 Brushless DC motor drive circuit

    Full-wave driving of a three phase motor requires three push-pull output stages. In each of the six possible states two outputs are active, one sourcing (H) and one sinking(L). The third output presents a high impedance (Z) to the motor, which enables measurement of the motor back-EMF in the corresponding motor coil by the EMF comparator at each output. The commutation logic is responsible for control of the output transistors and selection of the correct EMF comparator. In Table 1 the sequence of the six possible states of the outputs has been depicted.

    The zero-crossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment for the next commutation,that is, the change to the next output state. The delay is calculated (depending on the motor loading) by the adaptive commutation delay block.

    Thursday, April 02, 2020

    LM311 - Voltage Comparator

    The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower than devices like the LM106 or LM710. They are also designed to operate over a wider range of supply voltages: from standard ±15V op amp supplies down to the single 5V supply used for IC logic.

    LM311 - Voltage Comparator

    LM311 - Voltage Comparator

    Both the inputs and the outputs of the LM111, LM211 or the LM311 can be isolated from system ground, and the output can drive loads referred to ground, the positive supply or the negative supply. Offset balancing and strobe capability are provided and outputs can be wire ORed.
    • Operates from single 5V supply
    • Input current: 150 nA max. over temperature
    • Offset current: 20 nA max. over temperature
    • Differential input voltage range: ±30V
    • Power consumption: 135 mW at ±15V
    Related Resources -

    Voltage Comparator Information And Circuits

    This page provides basic information about voltage comparator integrated circuits and is to act as reference material for other circuits. The circuits shown are based on the LM339 Quad Voltage Comparator chip or the LM393 Dual Voltage Comparator chip. These devices are functionally the same. The LM311 Voltage Comparator can be used for these applications as well but it also has a number of unique features.

    Comparators and Schmitt Triggers

    An LM311 in a comparator circuit is shown at the right, with the pin numbers for the connections. The open-collector output is at pin 7, and the ground for this transistor is at pin 1. It is shown pulled up to the logic voltage of +5 with a 1k resistor, which is typical. The output of the LM311 can sink 8 mA. A comparator's output is essentially binary, YES or NO.

    Monday, February 17, 2020

    Introduction to Mechatronics

    Introduction to Mechatronics and Measurement Systems. This text provides comprehensive coverage of the field of mechatronics for mechanical, electrical and aerospace engineering majors. The author presents a concise review of electrical circuits, solid-state devices, digital circuits, and motors.

    Mechatronics and Measurement Systems

    Mechatronics design considerations are presented throughout the text and in Design Example. The text's numerous illustrations, examples, class discussion items, and chapter questions provide an opportunity to understand and apply concepts.

    Introduction to Mechatronics

    Online video demonstration available for viewing. The clips show and describe electronic components, mechatronic device and system examples, and laboratory exercise demonstrations.

    Mathcad and Matlab files for performing analyses throughout the book. The files can be downloaded and edited to perform similar and expanded analyses.

    Dr. David G. Alciatore and Michael B. Histand of the Colorado State University in Mechanical Engineering have books and info for Robotics and Mechatronic Students.

    Monday, February 10, 2020

    Cadence Design Systems and OrCAD

    Cadence RF Design Methodology Kit enables customers to rapidly address wireless opportunities by addressing system-level, verification and IC parasitic challenges.

    Cadence Design Systems and OrCAD

    Cadence PSpice A/D and Advanced Analysis - Spice-based simulator for system design. It simulates complex mixed-signal designs containing both analog and digital parts, and it supports a wide range of simulation models such as IGBTs, pulse width modulators, DACs, and ADCs.

    Cadence Design Systems and OrCAD

    Cadence OrCAD Capture and Capture CIS 

    Schematic design solution, supporting both flat and hierarchal designs from the simplest to the most complex. Seamless bi-directional integration with OrCAD PCB Editor enables data synchronization and cross-probing/placing between the schematic and the board design.

    Cadence Tutorial for VLSI Design

    This site contains a complete on-line tutorial for a typical bottom-up design flow using CADENCE Custom IC Design Tools (version 97A). The examples were generated using the HP 0.6 um CMOS14TB process technology files, prepared at North Carolina State University (NCSU) and made available through MOSIS.

    Extra Extra !