Oa-07: Oa-07 Current Feedback Op Amp Applications Circuit Guide:  National Semiconductor Application Note   (app note added 2/06)

Oa-11: Oa-11 a Tutorial on Applying Op Amps to RF Applications:  National Semiconductor Application Note   (app note added 2/06)

Oa-18: Oa-18 Simulation SPICE Models for Comlinear's Op Amps:  National Semiconductor Application Note   (app note added 2/06)

Oa-19: Oa-19 Wideband Op Amp Capable of µPower Operation:  National Semiconductor Application Note   (app note added 2/06)

Oa-22: Oa-22 Pushing Low Quiescent Power Op Amps to Greater Than 55dbm 2-Tone Intercept:  National Semiconductor Application Note   (app note added 2/06)

OA-25: OA-25 Stability Analysis of Current Feedback Amplifiers:  National Semiconductor Application Note   (app note added 2/06)

Op Amp Booster Designs:  National Semiconductor Application Note   (app note added 2/06)

Op amp can source or sink current:  3/2/06  EDN Design Ideas  /  (added 10/06)  Bipolar current source beats familiar Howland-current pump.

Op Amp Circuit Collection:  National Semiconductor Application Note   (app note added 2/06)

Op Amp Circuits:  Electronic Circuit design (added 02/05)

Op Amp Doubles as Instrumentation Amp:  09/15/94 EDN Design Ideas /  (added 11/05)

Op Amp Improves Power Supply's Regulation:  06/06/96 EDN Design Ideas  / (added 5/03)  A typical power supply has a voltage-regulation specification of 2 to 3% for all conditions, including initial setting, line, load, and temperature. You can improve regulation if the power-supply has remote-sensing capability, however.

Op Amp Increases Potentiometer's Resolution:  06/05/00 EDN-Design Ideas / (added 11/05)

Op Amp Linearizes Attenuator Control Response:  07/25/02 EDN Design Ideas  /  (added 12/04)  Professional-audio equipment commonly uses Analog Devices' (www.analog.com) high-performance, quad-voltage-controlled SSM2164 attenuator. The control response is -30 dB/V, with 0V producing unity gain. Attenuation increases as the applied control voltage increases in the positive direction. The circuit in Figure 1 extends the range of applications for this versatile chip by providing a simple......

Op Amp Linearizes Response of FET Vca:  09/05/02 EDN Design Ideas  /  (added 12/04)  FETs find common use in VCAs (voltage-controlled amplifiers) and attenuators, in which the FET serves as a variable resistance. A control voltage applied to the gate sets the channel resistance and overall circuit gain. You frequently need to select individual FETs because of wide spreads in FET characteristics....

Op Amp Output Impedance - App Note 10:  Apex Microtechnology Corp App Note (added 6/06)

Op Amp Radio:  (electronic circuit added 7/03)

Op Amps Make JFET Circuits Repeatable:  05/24/01 EDN-Design Ideas / (added 8/03)

Opacity Meter:  File contains several circuits, scroll to find this one (added 02/05)

Opamp Basics:  (circuit added 7/02)

Opamp Booster Designs :  National Semiconductor Application Note 09-Apr-1996 (app note added 4/02)

Opamp Circuit Collection :  National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)

Opamp Design and Test Board:  (electronic (schematic / circuit added 4/02)

Opamp Doubles as Instrumentation Amp:  09/15/94 EDN-Design Ideas / (added 4/02)  The circuit in Fig 1 shows an ordinary, off-the-shelf, general-purpose op amp configured as an instrumentation amplifier. Such a configuration yields an instrumentation amplifier having higher bandwidth than currently available dedicated instrumentation amplifiers have. The circuit in Fig 1 has a gain of 9 with a 3-dB bandwidth of 5 MHz for Ò5V signals. The CMRR is >80 dB at 1 MHz, and the large-signal transient response is good. The circuit is very stable. The offset voltage and temperature coefficient of this circuit depends entirely on the specs of the op amp you choose....  

Opamp Integrator:  (electronic schematic design added 02/05)

Opamp Linearizes Attenuator Control Response:  07/25/02 EDN-Design Ideas / (added 3/03) Professional-audio equipment commonly uses Analog Devices (www.analog.com) high-performance, quad-voltage-controlled SSM2164 attenuator. The control response is -30 dB/V, with0V producing unity gain.

Opamp Linearizes Response of FET Vca:  09/05/02 EDN-Design Ideas / (added 3/03) FETs find common use in VCAs (voltage-controlled amplifiers) and attenuators, in which the FET serves as a variable resistance. A control voltage applied to the gate sets the channel resistance and overall circuit gain.

Opamp Makes Precise 9 Volt Battery Splitter:  07/17/97 EDN-Design Ideas / (added 3/03)   -Alkaline 9V batteries are ideal for many portable, handheld applications, this circuit generates a bipolar supply of5V and ­2.3 to ­4V using a precision5V reference and one op amp as a supply splitter

Opamp Oscillators Simplify RF Designs:  10/10/96 EDN-Design Ideas / (added 3/03)

Opamp Radio:  (electronic (schematic / circuit added 4/02)

Opamp Rectifier Signals Input State:  07/21/94 EDN-Design Ideas / (added 3/03) The op-amp rectifier in Fig 1 operates from a single supply and provides a logic output and an LED that indicate the state of the input voltage. The input-state indications are handy for calibration. Because the circuit operates from a single supply, the 2.5V reference determines the level around which the circuit rectifies input waveforms.... 

Operational Amplifier AC Specifications and Applications:  Microchip Application Note Published 3-Apr-01   (app note added 2/06)

Operational Amplifier Topologies and DC Specifications:  Microchip Application Note Published 3-Apr-01   (app note added 2/06)

Operational Integrators:  AN-357 Analog Devices Application Notes  (app note added 6/06)

Optical Magnetic Projection Booth System:  (diagram added 6/03)