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Amplifier Circuits:  Operational
Operational Amplifiers:  #'s - A        B - C      D - K       L - N       O       P - S        T - Z 


Amplifier -- Main Page
 

Last Updated: November 30, 2017 07:38 AM

 
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±120V Output Precision Op Amp -  Simple shunt regulators provide normal supply levels to the op amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails.  Output transistors are protected by current-limiting. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

0A to 2A Current Source -  The LT1995 amplifies the sense resistor drop by 5V/V and subtracts that from VIN, providing an error signal to an LT1880 integrator.  The integrated error drives the PMOSFET as required to deliver the commanded current. __ Linear Technology/Analog Devices App Note, Mar 31, 2010

1 Op Amp achieves double-hysteresis-transfer characteristic -  09/27/07  EDN-Design Ideas An op amp combines with strategically placed zener diodes to yield a process-control circuit that has positive- and negative-going hysteresis bands __ Circuit Design by Herminio Martínez, Encarna García, and Juan Gámiz, Technical University of Catalonia, Barcelona, Spain

1.5A Rail-to-Rail Output Synchronous Step-Down Regulator Adjusts with a Single Resistor -  02/03/14EDN-Design Notes   One wire brings power & data to LCD module.  A new regulator architecture, the LTC3600   (first introduced with the LT3080 linear regulator), has wider output range and better regulation than traditional regulators.  Using a precision 50μA current source and a voltage follower, the output is adjustable from 0V to close to VIN.  Normally, the lowest output voltage is limited to the reference voltage __ Circuit Design by Jeff Zhang, also see Linear Technology Design Note 506

1µA Op Amp Permits Precision Portablery -  DN163 Design Notes __ Linear Technology/Analog Devices

100dB Range Logarithmic Photodiode Amplifier -  The photodiode current is processed by a form of trans-impedance amplifier   (TIA) that has a logarithmic I to V characteristic.  The VBE of the logging transistor is scaled and offset to properly represent the desired dynamic range.  To prevent temperature variation from affecting the accuracy, another loop is used as a stabilized chip heater for the transistor array. __ Linear Technology/Analog Devices App Note, Jun 21, 2011


100MHz Op Amp Features Low Noise Rail-To-Rail Performance While Consuming Only 2.5ma -  DN308 Design Notes __ Linear Technology/Analog Devices

1Hz to 100MHz Voltage to Frequency Converter Has 160dB Dynamic Range, Runs from 5V Supply -  This circuit achieves a wider dynamic range and higher output frequency than any commercially available voltage to frequency   (V→F) converter.  Its 100MHz full scale output   (10% over range to 110MHz is provided) is at least ten times faster than available units.  The circuit’s 160dB dynamic range   (8 decades) allows continuous __ Linear Technology/Analog Devices App Note, Mar 25th 2010

1-NiCd Cells Drives Op Amp -  12/05/96 EDN-Design Ideas Low-supply-voltage op amps, such as the LMC6582 and LMC6681 families, feature rail-to-rail I/O with a gain-bandwidth product greater than 1 MHz operating from just 1.8V.  Although impressive, this voltage is not low enough to power these amps using a single alkaline or NiCd/NiMH
cell, which have typical voltages of 1.25 to 1.5V.  It is rather tempting to bridge this gap by designing a DC/DC converter __ Circuit Design by Alexander Belousov, Rego Park, NY

2 Op Amps Provide Averaged Absolute Value -  30-Oct-03 EDN-Design Ideas 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 __ Circuit Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria

2 OpAmps Make Fast Full Wave Rectifier -  03/14/96 EDN-Design Ideas The circuit in Figure 1 is a precision full-wave rectifier with the following characteristics. __ Circuit Design by Fernando Werlang, CPqD-Telebras, Campinas, Brazil

2-Op Amps Provide Averaged Absolute Value -  10/30/03  EDN-Design Ideas 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 sec __ Circuit Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria

30-Khz Bandwidth High Linearity Opto-Isolated Amplifier -  This App Note presents isolation amplifier circuit designs useful in industrial, instrumentation, medical, and communication systems.  It covers the IL300’s coupling specifications, and circuit topologies for photovoltaic and photoconductive amplifier design. __ Designed by Vishay Semiconductors, Application Note 50

3-op-amp state-variable filter perfects the notch -  EDN-Design Ideas 12/15/2014     There are many variants of the state-variable filter, but this one might just have the best notch output  (s).   The usual schematic of a state-variable filter with two inverting integrators is well known.
Curiously, the input signal is almost always connected to the minus input of U1.  Figure 1 is an example with ω0 = 1kHz and Q = 5.   Figure 1  Typical state-variable filter The circuit is known for its versatility, and ability to simultaneously provide low-pass, band-pass, and high-pass outputs.   Gain, center frequency, and Q may be adjusted separately. __ Circuit Design by Alain Temps

3V & 5V 12-Bit Rail-To-Rail Micropower DACs Combine Flexibility & Performance -  DN127 Design Notes __ Linear Technology/Analog Devices

3V Operation of Linear Technology Op Amps -  DN56 Design Notes __ Linear Technology/Analog Devices

40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier -  For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used.  This is a high gain   (Av=1001) example with excellent low offset voltage and drift with temperature __ Linear Technology/Analog Devices App Note, Mar 16th 2010

–48V Low Side Precision Current Sense -  This amplifier configuration is essentially the complementary implementation to the classic high-side configuration.  The op amp used must support common-mode operation at its lower rail.  A floating shunt-regulated local supply is provided by the Zener diode, and the transistor provides metered current to an output load __ Linear Technology/Analog Devices App Note, Mar 31st 2010

50MHz Thermistor RMS to DC Converter using 5V Supply -  The LT1014 is the first precision quad operational amplifier which directly upgrades designs in the industry standard 14-pin DIP LM324/LM348/OP-11/4156 pin configuration.  It is no longer necessary to compromise specifications, while saving board space and cost, as compared to single operational amplifiers. __ Linear Technology/Analog Devices App Note, Mar 30th 2010

5-Band Graphic Equaliser -  This equaliser uses low-cost op-amps.  Good-quality op-amps powered by a single voltage supply are readily available in the market.  The op-amp should have a noise density of less than 24nV/ VHz, __ Electronics Projects for You

5-Band Graphic Equalizer -  This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO.  This circuit is very easy to build and has good Quality.  You can use it with Portable component stereos, tape-recorders, radio-cassette recorders, car stereos etc.  It is On-chip one operational amplifier. __ Designed by YMYA electronics-IZHAR FAREED

5V Powered, Linearized Platinum RTD 0°C to 400°C ±0.05°C Signal Conditioner -  The LT1014 is the first precision quad operational amplifier which directly upgrades designs in the industry standard 14-pin DIP LM324/LM348/OP-11/4156 pin configuration.  It is no longer necessary to compromise specifications, while saving board space and cost, as compared to single operational amplifiers. __ Linear Technology/Analog Devices App Note, Mar 29th 2010

5V Powered, Quartz-Stabilized 10kHz Voltage to Frequency Converter has 0.0015% Linearity & 8ppm/°C Temperature Coefficient -  Almost all precision voltage-to-frequency converters utilize charge pump based feedback for stability.  These schemes rely on a capacitor for stability.  A great deal of effort towards this approach has resulted in high performance V to F converters.  Obtaining temperature coefficients below 100ppm/°C requires careful attention __ Linear Technology/Analog Devices App Note, Mar 25th 2010

741 Op-Amp Tutorial -  What exactly is an OPerational AMPlifier? Let's define what that component is and look at the parameters of this amazing device.  An operational amplifier IC is a solid-state integrated circuit that uses external feedback to control its functions.  It is one of the most versatile devices in all of electronics.  The term 'op-amp' was originally used to describe a chain of high performance dc amplifiers that was used as a basis for the analog type computers of long ago.  The very high gain op-amp IC's our days uses external feedback networks to control responses.  The op-amp without any external devices is called 'open-loop' mode, referring actually to the so-called 'ideal' operational amplifier. __ Designed by Tony van Roon  VA3AVR

76V Over-the-Top® Input Op Amp Combines Precision, Versatility & Protection  -  With the increased-use of electronics in automotive and industrial applications, the need for robust and highly reliable components is essential to ensure a proper functioning system with low maintenance costs.  Automotive applications, for example have hostile environments where electronic components may be exposed to a variety __ Linear Technology/Analog Devices App Note, Arnold Nordeng Design Engineer-Signal Conditioning Products Mar 20th 2013

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Operational Amplifiers:  #'s - A        B - C      D - K       L - N       O       P - S        T - Z 


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