Tuesday, July 12, 2016

Handbook of Operational Amplifier Applications

Here are two important educational reference books from Texas Instruments in PDF format.

"While in the process of reviewing Texas Instruments applications notes, including those from the recently acquired Burr-Brown - I uncovered a couple of treasures, this handbook on active RC networks and one on op amp applications. These old publications, from 1966 and 1963, respectively, are some of the finest works on op amp theory that I have ever seen. Nevertheless, they contain some material that is hopelessly outdated. This includes everything from the state of the art of amplifier technology, to the parts referenced in the document - even to the symbol used for the op amp itself:"

Handbook of Operational Amplifier Applications

Handbook of Operational Amplifier Applications - PDF
by Bruce Carter and Thomas R. Brown - sboa092a.pdf - 2.1 Mb

The operational amplifier is an extremely efficient and versatile device. Its applications span the broad electronic industry filling requirements for signal conditioning, special transfer functions, analog instrumentation, analog computation, and special systems design. The analog assets of simplicity and precision characterize circuits utilizing operational amplifiers.

Handbook of Operational Amplifier Active RC Networks - PDF
by Bruce Carter and L.P. Huelsman - sboa093a.pdf - 3.6 Mb

This is a handbook on active RC networks. The first question about this subject that one might ask is, "What is an active RC network?" The answer is simple. It is collection of resistors, capacitors, and an active element (or elements). Viewed in another sense; it is a circuit without inductors. Why leave out inductors? There are many reasons. First of all, the inductor is a relatively large and heavy element. This is especially true at frequencies in the audio range and below.

Saturday, July 09, 2016

John Loomis – Computing and Engineering

Dr. John S. Loomis is the Associate Professor in the Electrical and Computer Engineering Department of The University of Dayton.

John Loomis - Course Web Pages

At the Course pages you can see subjects like Signal Processing, Digital Signal Processing, Analog Microelectronics Design and Electro-Optics.

The Altera DE2 board comes with a Control Panel facility that allows a user to access various components on the board through a USB connection from a host computer.

The DE2 Control Panel can be used to change the values displayed on 7-segment displays, light up LEDs, talk to the PS/2 keyboard, read/write the SRAM, Flash Memory and SDRAM, load an image pattern to display as VGA output, load music to the memory and play music via the audio DAC.

Altera DE2 Board

Altera DE2 Board and Projects with Nios II CPU

"The Altera Development and Education (DE2 ) board from Terasic Technologies Inc. is a wonderful vehicle for learning about digital logic, computer organization, and FPGAs. Featuring an Altera Cyclone II FPGA, the DE2 board offers varied technology suitable for university and college laboratory use, a wide range of design projects, as well as sophisticated digital system development tools."

Also see Microchip PIC32 - PIC32 Architecture and Programming

Friday, July 01, 2016

12-Bit, 4-20mA Loop-Powered System

An Application note and Evaluation Kit from Analog Devices. This solutions helps you evaluate a part of a Process Control or Data Acquisition module that you may wish to design.

"In the circuit, the ADuCM360 is connected to a Type T thermocouple and a 100 Ω platinum resistance temperature detector (RTD). The RTD is used for cold junction compensation. The low power Cortex-M3 core converts the ADC readings to a real temperature value. The Type T temperature range supported is −200°C to +350°C, and this temperature range is converted to an output current range of 4 mA to 20 mA."

12-Bit, 4-20mA Loop-Powered Thermocouple Measurement System

12-Bit, 4-20mA Loop-Powered System

The thermocouple used in this application is a Type T (copper-constantan) that has a temperature range of −200°C to +350°C. Its sensitivity is approximately 40 μV/°C, which means that the ADC in bipolar mode, with a PGA gain of 32, can cover the entire temperature range of the thermocouple.

The RTD was used for cold junction compensation. The particular one used in this circuit was a platinum 100 Ω RTD, Enercorp PCS 1.1503.1. It is available in a 0805, surface-mount package. This RTD has a temperature variation of 0.385 Ω/°C.