The Monolithic Operational Amplifier: A Tutorial Study:  National Semiconductor - Application Note   (app note added 2/06)

Timer Exploits Opamp Bias Current:  07/21/94 EDN-Design Ideas / (added 5/03) The simple, low-cost analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors. After all, because the input-bias current is the minimum current flow into an op amp, this method produces the longest time delays possible from a given capacitor and op amp....  

To 3 Case Low Power Amplifier :  (added 6/03)

Topics on using the LM6181 New Current Feedback Amplifier :  National Semiconductor Application Note 05-Aug-1995 (app note added 4/02)

TP-15: Reducing DC Errors in Op Amps (Addendum to AN241 and 242):  National Semiconductor - Application Note   (app note added 2/06)

Transformerless Microphone PreAmplifier :  (added 6/03)

Tutorial on Applying Opamps to RF Applications :  National Semiconductor Application Note 02-Apr-1999 (app note added 4/02)

Two Op Amps Provide Averaged Absolute Value:  10/30/03 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1 is useful when you need amplitude demodulation or an averaged absolute-value conversion. The circuit comprises two stages, the first of which, IC1A, is a differential-output absolute-value converter. The second stage, IC1B, is a traditional differential amplifier. The combination of the two stages performs single-ended absolute-value conversion but only if R3>>R2....

Two Opamps Make Fast Full Wave Rectifier:  03/14/96 EDN-Design Ideas / (added 1/06) The circuit in Figure 1 is a precision full-wave rectifier with the following characteristics: Minimal delay time between the input and output (with only one op amp in the chain); Similar delay times for positive and negative inputs; No need to match diodes or adjust resistors.  When VIN>0V, the output of op amp IC1 is negative, so the reverse-biased diode D1 blocks the output path of IC1 to VOUT. The output of op amp IC2 is positive, so the….

Two Wire Remote Microphone Amplifier :  (added 6/03)

Ultra Low Noise Op Amp Combines Chopper and Bipolar Op Amps:  DN36 -  Design Notes (Linear Technology) (app note added 1/06)

Ultra Low Voltage Differential Amplifier:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 6/06)

Ultra-Low Noise Low Distortion Audio Op Amp:  Linear Technology LT1115  (Circuit / schematic design added 6/06)

Unique IC Buffer Enhances Op Amp Designs Tames Fast Amplifiers:  AN16 - Linear Technology - This note describes some of the unique IC design techniques incorporated into a fast, monolithic power buffer, the LT1010. Also, some application ideas are described such as capacitive load driving, boosting fast op amp output current and power supply circuits. (app note added 6/06)

Universal Evaluation Board for Dual High Speed Op Amps in SOT-23-8 Packages:  AN-675 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps in CSP Packages:  AN-677 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps in SOT-23-5/SOT-23-6 Packages:  AN-674 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Dual in MSOP package:  AN-648 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Dual SOIC Package:  AN-647 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Single in SOIC Package:  AN-646 - Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board of High Speed Op Amps in SC70 Packages:  AN-676 - Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in MSOP Package:  AN-733 - Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SC70 Package:  AN-734 - Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SOIC Package:  AN-732 - Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SOT-23 Package:  AN-735 - Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board:  AN-692 - Analog Devices Application Notes  (app note added 2/06)

Unlimited Capacitive Load Drive Op Amp Takes Guess Work Out of Design:  National Semiconductor - Application Note   (app note added 2/06)

Updated Operational Amplifier Selection Guide for Optimum Noise Performance:  DN140 -  Design Notes (Linear Technology) (app note added 1/06)

Use Op Amp Injection for Bode Analysis:  09/16/2004  EDN-Design Ideas  Bode analysis is an excellent way to measure small-signal stability and loop response in power-supply designs. Bode analysis monitors gain and phase of a control loop. It performs this monitoring by breaking the feedback loop and injecting a signal into the feedback node and then comparing the injected signal with the output signal of the control loop.  (Schematic / circuit added 10/05)

Use the LM158/LM258/LM358 Dual Single Supply Opamp :  National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)

User's Guide to Applying and Measuring Operational Amplifier Specifications:  AN-356 - Analog Devices Application Notes  (app note added 6/06)

Using Single Supply Operational Amplifiers in Embedded Systems:  Microchip Application Note - Published 3-Apr-01   (app note added 2/06)

Using the AD813X Differential Amplifier:  AN-584 - Analog Devices Application Notes  (Circuit / schematic design added 6/06) The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage. (app note added 2/06)

Using the Analog Devices Active Filter Design Tool:  AN-649 - Analog Devices Application Notes  (app note added 2/06)

Using the LTC Op Amp Macromodels:  AN48 - Linear Technology - LTC's op amp macromodels are described in detail, along with the theory behind each model and complete schematics of each topology. Extended modeling topics are discussed, such as phase/frequency response modifications and asymmetric slew rate for JFET op amp models. LTC's macromodels are optimized for accuracy and fast simulation times. Simulation times can be further reduced by using streamlining techniques found throughout AN48. (app note added 2/06)

V 44 Video Distribution Amplifier Schematic :  (added 6/03)

Video Multiplexer uses High Speed Op Amps:  08/21/03 EDN Design Ideas  /  (added 12/04)  Video multiplexers route video from several sources to a single channel. Low-end consumer products use CMOS analog switches and multiplexers, such as the 4066 and 4051. Unfortunately, these devices have a series on-resistance that ranges from approximately 100Ω to 1 kΩ, a resistance that is not constant with video level and that appears in series with the signal....

Wideband Op Amp Capable of µPower Operation:  National Semiconductor - Application Note   (app note added 2/06)

Wien Bridge Oscillator (Rail-to-Rail) Sine Wave Generator :  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 6/06)

Working with High Impedance Op Amps:  National Semiconductor - Application Note  (app note added 2/06)