In-Circuit Tester:    This is an in-circuit tester that to check correctly wired. It can test a circuit board without be influenced by semiconductor parts.  (added 10/05)

Input Filter Prevents Instrumentation Amp RF Rectification Errors:    11/13/03 EDN Design Ideas  /  (added 1/05)  Instrumentation amplifiers serve in a variety of applications that need to extract a weak differential signal from large common-mode noise or interference. However, designers often overlook the potential problem of RF rectification inside the instrumentation amplifier. The amplifier's common-mode rejection normally greatly reduces common-mode signals at an instrumentation amplifier's input....

Instrumentation Amp has Differential Outputs:    08/19/04 EDN Design Ideas  /  (added 12/04)    State-of-the-art ADCs accept differential inputs, allowing you to differentially implement the entire signal path from sensor to converter. This structure provides significant performance advantages, because differential signals increase the dynamic range, reduce hum, and eliminate ground noise. Figures 1a and 1b show two common differential-output instrumentationamplifier circuits....

Instrumentation Amp Makes Noninverting Integrator:    09/19/02 EDN Design Ideas  /  (added 12/04)  Figure 1a shows the classic implementation of an integrator. The circuit has two properties that may be undesirable in same applications: It necessarily inverts, and it requires a split-supply or midsupply reference. Figure 1b shows an implementation of an integrator that uses an LT1789 instrumentation amplifier....

Instrumentation Amp Provides Unipolar and Bipolar Outputs #1:    07)/20/00 EDN-Design Ideas / (added11/05) Intelligent sensors and signal conditioners for plant-automation systems must produce outputs compatible with standard data-acquisition systems, such as PCs, programmable logic controllers, and remote terminals for supervisory and control systems. Standard analog inputs are 0 to 1V, ±10V, 0 to 1 mA, and 4 to 20 mA. The circuit in Figure 1 makes all these signals available, using only three packages in addition to the DAC. The voltage-output section requires a thin-film resistor package, Beckman Series 668/698, which tracks with temperature, and two FET-input op amps. The current-output section requires the addition of a four-resistor package, Beckman Series 664/694, and two more op amps....

Instrumentation Amp Provides Unipolar and Bipolar Outputs #2:    08/03/00 EDN-Design Ideas  / (added 11/05)   Intelligent sensors and signal conditioners for plant-automation systems must produce outputs compatible with standard data-acquisition systems, such as PCs, programmable logic controllers, and remote terminals for supervisory and control systems. Standard analog inputs are 0 to 1V, ±10V, 0 to 1 mA, and 4 to 20 mA. The circuit in Figure 1 makes all these signals available, using only three packages in addition to the DAC. The voltage-output section requires a thin-film resistor package, Beckman Series 668/698 (which tracks with temperature), and two FET-input op amps. The current-output section requires the addition of a four-resistor package, Beckman Series 664/694, and two more op amps....

Instrumentation Amp Swings Rail-to-Rail:    03/03/94 EDN-Design Ideas / (added 4/02)  You can combine an instrumentation amplifier and an inexpensive CMOS op amp to get the better of two worlds: the precision of a bipolar instrumentation amp and the5V single-supply operation of the CMOS op amp. The characteristics of such a circuit depend first on the instrumentation amp you use. The INA131 delivers50-µV max voltage offset,0.25-µV/°C max offset drift, and100-dB min common-mode rejection. Next, how close the output swings to the power supplies rail depends on which rail-to-rail op amp you use. A Texas Instruments TL2272, for example, swings outputs to within100 mV of the rails.  

Instrumentation Amp Works from One Supply:    03/16/00 EDN-Design Ideas / (added 11/05)

Instrumentation amplifier extends DSO:    1/5/06  EDN Design Ideas  /  (added 10/06)  Elusive current waveforms required scope documentation.

Instrumentation Amplifier has 290 MHz Gain Bandwidth Product :    05/12/94 EDN-Design Ideas / (added 4/02) very high frequency instrumentation amplifier based on video-difference amplifier

Instrumentation Amplifier:    National Semiconductor Application Note   (app note added 2/06)

Instrumentation Amplifiers :    National Semiconductor Application Notes,28-Jun-1996 (app note added 4/02)

Instrumentation Amplifiers Solve Unusual Design Problems:    AN-245 Analog Devices Application Notes  (app note added 2/06) Traditionally Considered Only for Transducer-Conditioning Applications, Instrumentation Amplifiers Bring Unique Performance Benefits to a Range of Other Applications as Well.

Instrumentation Applications for a Monolithic Oscillator:    AN93 Linear Technology Instrumentation applications for a monolithic programmable oscillator are presented in this publication. Circuits include platinum and thermistor based thermometers, an isolated thermometer and three relative humidity signal conditioners. Bipolar and FET input chopper stabilized amplifiers with noise below 45nV (0.1Hz to 10Hz) are detailed. Two clock tunable sine wave generators with settable amplitude appear, as well as a tunable notch filter, an interval generator and an A to D converter. The oscillator's performance is contrasted against other approaches and its interval operation discussed.

Instrumentational Amplifiers:    National Semiconductor Application Note   (app note added 2/06)

Keys to Longer Life for CMOS:    AN-349 Analog Devices Application Notes  (app note added 2/06) Here's How CMOS Can be Protected Against Abuse

LB-1: Instrumentation Amplifier:    National Semiconductor Application Note   (app note added 2/06)

LB-21: Linear Brief 21 Instrumentational Amplifiers:    National Semiconductor Application Note   (app note added 2/06)

Lightning Detector:    (electronic circuit added 10/05)

Logic Probe:    (electronic circuit added 10/05)

Logic Tester:    This is a simple logic level tester with pulse stretch capability.  (added 10/05)

Lopic Logic Probe With Pulser:    (electronic circuit added 10/05)

Lost Cost Isolation Amplifier Suits Industrial Applications:    02/03/00 EDN Design Ideas  /  (added 10/05) The circuit in Figure 1a is a low-cost isolation amplifier for instrumentation applications that provides as much as 500V of galvanic isolation between input and output. The amplifier uses only one small, low-cost transformer and with little modification lends itself to cost-effective multichannel applications. Input-to-output linearity is around 0.05% for a 2V input signal. The LM385 (National Semiconductor) low-power programmable reference diode, which operates in the shunt mode, and the dual planar BAV99 (Philips Semiconductors) diode are the major circuit components...

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

LT1167: Single Resistor Sets the Gain of the Best Instrumentation Amplifier:    DN182  Design Notes (Linear Technology) (app note added 1/06)

Lux Meter:    This is a simple Lux Meter that is suitable for beginners.  (added 10/05)