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Amplifier Circuits:  Differential   Page 1
Differential Amplifiers:    #-A    B-E    F-N    O-S    T-Z

Amplifier -- Main Page
Last Updated on: Thursday, April 07, 2016 01:00 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

-/+-0.1V Differential Amplifier Circuit using Zero Threshold EPAD MOSFETs -  This circuit presents a differential Amplifier using Zero Threshold EPAD MOSFETs that oooooperates on 1/- 0.1v supplies.  The schematic diagram is for a single Amplifier stage… [Circuit Ideas for Designers App Note - .]


±250V Common Mode Range Difference Amplifier (AV = 1) -  This is a modified difference Amplifier- it has effectively added resistances from each input to ground to attenuate the common mode signal. This allows the wide input range without exceeding the VCM of the opamp.… [Linear Technology App Note - , Jun 21, 2011]


±5V Precision Instrumentation Amplifier -  A flying capacitor is ideal for virtually eliminating dc and low frequency common mode errors. This is desired for a low voltage differential to single ended instrumentation Amplifier stage.… [Linear Technology App Note - , Jun 21, 2011]

10°C to 40°C Thermistor Thermometer -  The LT1789 is a micropower, precision instrumentation Amplifiers that are optimized for single supply operation from 2.2V to 36V. The quiescent current is 95μA max, the inputs common mode to ground and the output swings within 110mV of ground. The gain is set with a single external resistor for a gain range of 1 to 1000 for… [Linear Technology App Note - , Mar 30th 2010]


2 Instrumentation Amps Make Accurate Voltage-To-Current Source -  05/14/09  EDN Design Idea   Many designs require precise voltage-controlled current sources, especially in the presence of variable loads. Common approaches, which use a few op Amps and a handful of passive components, have inherent errors due to nonideal com… [by Frank Ciarlone, Analog Devices, Wilmington, MA]


2.7V to 5.5V Precision High Side Current Sense -  This high side current sense Amplifier works down to 2.7V. Even with such a low supply voltage, accuracy of the voltage sensed across resistor Rs is preserved due to the very low voltage offset error of the LTC6078 Amplifier (7uV typical).… [Linear Technology App Note - , Mar 16th 2010]


2.7V to 5.5V Ultra High Precision Current Sense -  This is a low-voltage, ultra-high-precision monitor featuring a Zero-Drift Instrumentation Amplifier (IA) that provides Rail-to-Rail inputs and outputs. Voltage gain is set by the feedback resistors. Accuracy of this circuit is set by the quality of resistors selected by the user, small-signal range is limited by VOL in single-supply… [Linear Technology App Note - , Mar 30th 2010]


25 Hz Peaking Amplifier-Using Model 425 -  No description, just graph - OpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. … [Application OpAmps Lab Inc.]


85V, –100V Common Mode Range Instrumentation Amplifier (AV = 10) -  The input section is a classic difference Amplifier set to A=0.1 so that the Vcm is attenuated by 10x along with the signal of interest. The second section has A=100 so that the overall circuit has A=10 but yet supports a large Vcm working range.… [Linear Technology App Note - , Jun 21, 2011]


A Fully Differential Input Voltage Amplifier -  National Semiconductor Application Note  …


A Single Amplifier Precision High Voltage Instrument Amp -  DN25  Design Notes (Linear Technology)…


A Single-Ended Input to Differential Output Amplifier -  This circuit shows a circuit for generating a differential signal from a single-ended input. The differential output noise is a function of the noise of the Amplifiers, the noise of resistors R1 and R2 and the noise bandwidth. For example, if R1 and R2 are each 200W, the differential output voltage noise density is 9.5 nV/ÖHz and in a 4MHz noise bandwidth, the total differential output noise is 19mVRMS (with a low level 0.2VRMS differential signal, the signal-to-noise ratio is an excellent 80.4dB). … [Linear Technology App Note - , Jul 2, 2012]


AC Couple Analog Signals without a DC Bias Source -  02/03/00 EDN Design Idea   A conventional ac-coupling circuit in a single-supply system comprises a series capacitor and a shunt resistor to ground. Unfortunately,negative peaks ofinput signal can exceed 0.3V input operating-range limits of an ADC, suc… [by Joseph Luis Sousa, Linear Technology Corp, North Chelmsford, MA]


AC line powers microcontroller-based fan-speed regulator -  09/30/04  EDN Design Idea   The need for conditioning low-level ac signals in the presence of both common-mode noise and differential dc voltage prevails in many applications. In such situations, ac-coupling to instrumentation and difference Amplifiers is mandatory to extract the ac signal and reject common-mode noise and differential dc voltagePDF has several circuits listed, please scroll down to find this one… [by Francis Rodes, Olivier Chevalieras, and Eliane Garnier, ENSEIRB, Talence, France]


Active-feedback IC serves as current-sensing instrumentation Amplifier -  07/24/03  EDN Design Idea   High-speed current sensing presents a designer with some significant challenges. Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a res… [by Jonathan Pearson, Analog Devices, Wilmington, MA]


Adjustable-Gain Difference Amplifier Circuit Measures Hundreds of Volts, Rejects Large Common-Mode Signals -  Analog Devices-Analog Dialogue… [by Gerstenhaber, Moshe and O'Sullivan, Michael]


Amplifier and Current Source Emulate Instrumentation Amplifier -  11/13/03  EDN Design Idea   The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to Amplify a small-amplitude differential signal contaminated with high common-mode noise. In some applications, the signal source is floating wi… [by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria]


Amplifier removes common-mode noise on RGB differential-video-transmission line -  04/13/06  EDN Design Idea   Use a single operational Amplifier to minimize common-mode signals' effects on differential-component-video receivers… [by Tamara Papalias and Mike Wong, Intersil Corp]


AN-347: Shielding & Guarding -  AN-347 Analog Devices App Note How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach…


AN-581: Biasing & Decoupling Op Amps in Single Supply Applications -  AN-581 Analog Devices App Note -   …


AN-584: Using the AD813X Differential Amplifier -  AN-584 Analog Devices App Note -  The AD813x differs from conventional op Amps by  external presence of an additional input and output. The additional input, VOGM, controls  output common mode voltage.…


AN-589: Ways to Optimize the Performance of a Difference Amplifier -  AN-589 Analog Devices App Note -   This Application Note presents several ways to build and optimize  performance of a discrete difference Amplifier. It also recommends Amplifiers that will make  overall solution cost/performance competitive with monolithic instrument Amplifiers.…


AN-692: Universal Precision Op Amp Evaluation Board -  AN-692 Analog Devices App Note -   …


AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices App Note -   …


Automatic-exposure scheme uses CCD shutter -  07/02/98 EDN Design Idea   (File contains several circuits.Scroll to this one)  This application follows the Design Idea, "Peak detector maximizes CCD-sensor range" (EDN, Aug 15, 1996). Its aim was to optimize the performance of an A/D converter used to digitize a linear CCD sensor's analog output. The method involved stretching the upper reference of the flash ADC for the highest lit pixel in the array. The method works well, but does not obtain the best performance from the CCD, which can saturate for overexposure or can produce noise for underexposure. Figure 1 shows a better method that you can use with CCD sensors that provide a shutter facility.… [by Giovanni Romeo and Sandro Rao, Istituto Nazionale Di Geofisica, Rome, Italy]


Autozero a position-sensing detector -  03/18/99  EDN Design Idea (contains several designs, scroll to find this one)   Autozeroing schemes can be necessary to minimize the input-offset voltages of position-sensing detectors (PSDs), particularly when you use these detectors with high dc gain. PSDs are useful optical transducers for accurately measuring displacement. In practice, their typical configuration is as a differential current-to-voltage circuit (Figure 1). The ratio of the photocurrents I1-to-I2 linearly divides between the electrodes, proportional to the incident light beam. The magnitude of the photocurrents is a function of the light intensity. … [by James Zannis, Renishaw S A, Champs-sur-Marne, France] 


Differential Amplifiers:    #-A    B-E    F-N    O-S    T-Z

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