Showing posts with label Opamps. Show all posts
Showing posts with label Opamps. Show all posts

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 Nevertheless, they contain some material that is hopelessly outdated.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.

Monday, June 06, 2016

Linear Circuit Design Handbook - Hank Zumbahlen

Linear Circuit Design Handbook, edited by Hank Zumbahlen (Newnes, 2008), bridges the gap between circuit component theory and practical circuit design. Effective analog circuit design requires a strong understanding of core linear devices and how they affect analog circuit design.

Linear Circuit Design Handbook – Hank Zumbahlen

This book provides complete coverage of important analog devices and how to use them in designing linear circuits, and serves as a useful learning tool and reference for design engineers involved in analog and mixed-signal design.

Linear Circuit Design Handbook - Hank Zumbahlen

Chapters Include

Sensors, RF/IF Circuits, Converters. Analog Filters. Power Management and …
  • Chapter 5: Fundamentals of Sampled Data Systems
  • Chapter 7: Data Converter Support Circuitry
  • Chapter 11: Overvoltage Effects on Analog Integrated Circuits
  • Chapter 12: Printed Circuit Board (PCB) Design Issues

Sunday, June 05, 2016

Walt Jung - OpAmp Applications Handbook

Comprises Op Amp Basics, Specialty Amplifiers, Using Op Amps with Data Converters, Sensor Signal Conditioning, Analog Filters, Signal Amplifiers, Hardware and Housekeeping Techniques, and Op Amp History.

Walt Jung - OpAmp Applications Handbook

In the past several years, many advances have been made in operational amplifiers and the latest op amps have powerful new features, making them more suitable for use in many products requiring weak signal amplification, such as medical devices, communications technology, optical networks, and sensor interfacing.

Walt Jung - OpAmp Applications Handbook

Walt Jung, analog design guru and author of the classic IC OP-Amp Cookbook (which has gone into three editions since 1974), has now written what may well be the ultimate op amp reference book.

As Jung says, “This book is a compendium of everything that can currently be done with op amps.” This book is brimming with up-to-date application circuits, handy design tips, historical perspectives, and in-depth coverage of the latest techniques to simplify op amp circuit designs and improve their performance.

Analog Dialogue: Analog Devices

See Application Notes too on Amplifiers and Comparators, Current Sense Amplifiers, Differential Amplifiers, Instrumentation Amplifiers, Isolation Amplifiers.

Wednesday, March 16, 2016

CA3140 and CA3130 Special Opamps

CA3140 and CA3130 are originally RCA part numbers( i feel). They are amazing close to ideal opamps, the input offset has to be trimmed. I used to use it when high input impedance is required. 1.5T ohm 10pA is the specs. A Electrometer can be made with just one opamp.

CA3130 has the additional Merit of swinging to the rails, if you are on a +/- 12V supply, the output will be +/-12V. This is a feature required in control applications.

These devices are now available with Intersil.

CA3140 -4.5MHz, BiMOS Operational Amplifier with MOSFET Input/Bipolar Output

The CA3140A and CA3140 BiMOS operational amplifiers feature gate protected MOSFET (PMOS) transistors in the input circuit to provide very high input impedance, very low input current, and high speed performance. The CA3140A and CA3140 operate at supply voltage from 4V to 36V (either single or dual supply).

Voltage regulator that uses CA3130

A voltage regulator that uses CA3130 - Range 0.1 to 50V at 1 Amp.
CA3130 - 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output

"15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output
A CMOS transistor-pair, capable of swinging the output voltage to within 10mV of either supply-voltage terminal (at very high values of load impedance), is employed as the output circuit."

Applications - Ground-Referenced Single Supply Amplifiers, Fast Sample-Hold Amplifiers, Long-Duration Timers/Monostables.

Wednesday, January 06, 2016

Two Op-Amp Differential Amp

This is an ideal circuit for sensor amplification. Strain Bridge circuits too. It is an instrumentation amplifier, means precision. High input impedance to a differential input signal source. The gain can be set with external resistors to over 1000. CMRR trim to match resistor network.

Linear Technology Circuit Two Op Amp Instrumentation Amplifier

Two Op-Amp Differential Amp

I measure Instrumentation Amplifier like this - Tera Ohms Impedance, Pico Amps Bias Current. Micro Volts Offset Voltage. Here is a Interactive demo i built for such a configuration. The Input Impedance of this module is very high and is symmetric. This circuit can be used for strain gauges and for four wire measurements. If inputs are in mV use OP07. The merit is that it uses only 2 OpAmps yet has high differential Input Impedance.

Dual Op-Amp Differential Amp Tutorial

The Outputs of Opamps are low impedance but still have limits they cannot drive more than a few mA of Current into the Load. If low ohmic value loads are to be applied use external transistors as amplifiers. If inputs Vn-Vp are floating, outputs may be random or oscillating, it is good to have a bias network of 10M resistors to a potential even zero or common, this enables some Vout when input floats.

Wednesday, May 13, 2015


The JFET-input operational amplifiers in the TL07x series are designed as low-noise versions of the TL08x series amplifiers with low input bias and offset currents and fast slew rate. The low harmonic distortion and low noise make the TL07x series ideally suited for high-fidelity and audio preamplifier applications. Each amplifier features JFET inputs (for high input impedance) coupled with bipolar output stages integrated on a single monolithic chip.

  • Low Power Consumption
  • Low Input Bias and Offset Currents
  • Low Noise
  • High Input Impedance JFET Input Stage
  • High Slew Rate - 13 V/┬Ás Typ
  • Common-Mode Input Voltage Range Includes VCC+
Quadrature Oscillator - 100 kHz - TL072-TI - TL072-TI Opamp
Quadrature Oscillator - 100 kHz

Thursday, January 14, 2010

Advanced Linear Devices ALD - Precision CMOS IC

Analog semiconductors for OEM manufacturers of industrial controls, instrumentation, computers, medical devices, automotive, and telecommunications products.

Advanced Linear Devices ALD - Precision CMOS IC

Energy Harvesting Modules

Some Products Like -
  • Ultra-low Input Signal Power Rail-to-Rail CMOS OpAmps
  • Ultra-low Charge Injection Low Voltage Analog Switches
  • High resolution Dual Slope Integrating Analog Processors
  • ±5 1/2 Digit DVM Digital Voltmeter Boards
Energy Harvesting Modules 

"These modules capture residual energy as a by-product of a natural environmental phenomenon or industrial process, storing and and conditioning the energy for use at a later time."

ALD's mixed signal ASIC design

ALD's standard linear product as Breadboard Design Kit for Mixed Analog/Digital ASIC. Includes Opamps, Comparators, Mosfets etc. Create a Function-Specific Mixed ASIC chip.

Advanced Linear Devices, Inc
415 Tasman Drive, Sunnyvale California 94089

Wednesday, December 09, 2009

Microbridge - Rejustors and Strain Gauge Sensors

Microbridge - Rejustors and Strain Gauge Sensors

Microbridge - Rejustors and Strain Gauge Sensors

"The Rejustor, from Microbridge, is an electrically adjustable resistor that can be precisely adjusted, in-circuit, to calibrate and compensate analog circuits and systems. Low-TCR Rejustors are resistance-only adjustable, available in standard and low-power duals and low-power singles."

Quick Design Ideas - Microbridge

Products Include - Sensors and Micro Flow Sensors and Sensor Conditioning with Rejustors.

Tuesday, December 05, 2006

Wide-Bandwidth Dual JFET Opamp LF353

These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage.

They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents.

Wide-Bandwidth Dual JFET Opamp LF353

LF353 - Wide Bandwidth Dual JFET Input Operational Amplifier

Some Highlights
  • Gain Bandwidth 4 MHz
  • Slew Rate 13 Volts/usec
  • Offset Voltage 10 mV
  • Low Input Bias Current: 50pA
  • High Input Impedance: 1 Tera Ohms