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Amplifier Circuits:  Operational
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Last Updated: November 21, 2017 05:44 AM

 
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Part 3 of 4: Defence Lasers & Optronic Systems: Semiconductor Diode Laser Electronic -  While semiconductor diode lasers, or simply laser diodes, are extensively used in a range of laser devices intended for tactical military applications, such as

P-channel power-MOSFET driver uses unity-gain op Amp -  21-Jan-10 EDN-Design Ideas Drive a power MOSFET to 100V dc with this signal-conditioning circuit __ Circuit Design by Suded Emmanuel, Emmanuel's Controls, Auckland, NZ

pH Probe Amplifier -  pH Probe amplifiers require buffer amplifiers with an input impedance greater than 10^13 ohms.  Without loading the probe, an output of approximately 60mV/pH unit is produce.  The thermistor is added to provide first order compensation for the inherent temperature coefficient of the pH probe output __ Linear Technology/Analog Devices App Note, Mar 16, 2010

Phase Compensation Counteracts Op-Amp Input Capacitance -  01/06/94  EDN-Design Ideas Although op amps are mature devices, many designers often ignore the effects of input capacitance on frequency stability.  A bode plot analysis lets you add compensation capacitors to counteract poles and zeros caused by an op amp's input capacitance.  A __ Circuit Design by Jerald Graeme, Burr-Brown Corp

Photodiode Amplifier -  Low input bias current amplifiers can be used to accurately detect the amount of current flowing in a photodiode.  An output voltage, 1V/uA, is created by forcing the reverse diode current to flow from the amplifier output through a large valued feedback resistor. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Photodiode Amplifier exhibits one-third the output noise of conventional transimpedance Amp -  04/26/07  EDN-Design Ideas Bumping the op amp's gain of a photodiode transimpedance amplifier by a factor of 10 and then dividing the output of a transistor gain stage by a factor of 10 achieves lower output noise __ Circuit Design by Glen Brisebois, Linear Technology Corp, Milpitas, CA

Piecewise Linear Amplifier Eschews Diode -  10/12/95 EDN-Design Ideas A common implementation of a piecewise linear amplifier uses diodes in the feedback loop of an op amp.  As the diodes become forward-biased, they effectively switch in resistors that alter the closed-loop gain of the amplifier.  This implementation has two disadvantages.  First, the diodes' shunt capacitance leads to poor high-frequency performance.  Second, __ Circuit Design by Brian Harrington, Analog Devices, Wilmington, MA

Piezoelectric Shock Sensor Amplifier -  A piezoelectric shock sensor generates a charge when physically accelerated.  This charge is transferred to the smaller feedback capacitor.  In this circuit a gain of 100 is given to the sensors open circuit voltage. __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Platinum RTD Signal Conditioner with Curvature Correction -  The value of the resistance of the RTD sensor is converted to a voltage by running a constant current, 50uA, through it.  As the sensor heats the resistance increases and unbalances the bridges of 1K resistors.  The amplifier restores balance by sourcing more current into the lower fixed 1K resistor thus producing an increasing __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Positive Supply Rail Current Sense with Over-the-Top Op Amp -  This is a configuration similar to an LT6100 implemented with generic components.  A Rail-to-Rail or Over-the-Top input op amp type is required (for the first section).  The first section is a variation on the classic high-side where the P-MOSFET provides an accurate output current into R2 (compared to a BJT).  The second section __ Linear Technology/Analog Devices App Note, Mar 30th 2010

Potentiometer Autonulls OpAmp -  10/22/98 EDN-Design Ideas Op-amp applications that need the highest possible dc accuracy are generally best served by CMOS chopper-stabilized amplifiers, such as the LTC1050.  But high-speed, low-noise applications may require high-performance rockets, such as the 700-MHz LT1226.  So what to do for applications __ Circuit Design by Stephen Woodward, University Of North Carolina, Chapel Hill, NC

Power Amplifier Has Transient Rail-To-Rail Swing -  09/29/94 EDN-Design Ideas Has transient rail-to-rail swing special common-drain MOSFET-based power op amp circuit __ Circuit Design by Yishay Netzer, Yuvalim, Israel

Precision Absolute Value -  An absolute value circuit as as a full wave rectifier.  Positive input voltqges cause the first amplifier to act as a unity gain inverter.  The second amplifier inverts thiis output again to produce a positive outut voltage.  Negative input voltages cause the + input of the second amplifier to move positive to a voltage of 2/3Vin. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Precision Amplifier Drives 500ohm Load to 10V -  Two amplifiers can be combined to double the output current of just one amplifier.  In this circuit the gain is arranged in such a way that ensures that each amplifier contributes half of the load current.  One tenth of the output voltage is impressed across a resistor that is one fifth of the load resistor making its current __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Precision Amplifier with Digital Control -  This circuit is similar to the preceding circuit of the attenuator.  Gain of up to 100 can be achieved in this configuration, which is useful forb signal conditioning of low output __ Electronics Projects for You

Precision Charge Integrator -  Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc

Precision Current Sink -  A non-inverting amplifier configuration can force an input control voltage across a ground referred resistor.  This creates a precise amount of current flow.  This current must be sunk by the external transitors so the same amount of current flows to ground from a positive supply referred load circuit. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Precision Current Source -  A non-inverting amplifier configuration can force an input control voltage across a ground referred resistor.  This creates a precise amount of current flow.  This current must be sunk by the external transitors so the same amount of current flows from ground and sourced to a negative supply referred load circuit. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Precision High Voltage High Side Load Current Monitor (1754) -  The LT6016/LT6017 are dual and quad rail-to-rail input operational amplifiers with input offset voltage trimmed to less than 50μV.  These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier.  The Over-The-Top input stage of the LT6016/LT6017 is designed to __ Linear Technology/Analog Devices App Note, Dec 4th 2012

Precision level shifter has excellent CMRR -  15-Apr-04 EDN-Design Ideas Most designers make level shifters with op amps and 1%-tolerance discrete resistors.  Discrete-resistor mismatching limits the op amp's CMMR(common-mode rejection ratio] to 40 dB, so you cannot use op amps in circuits that require high CMRR.  Differential amplifiers contain precision matched internal resistors, so ICs such as the INA133 can readily achieve CMRRs of approximately 90 dB __ Circuit Design by Ronald Mancini, Texas Instruments, Bushnell, FL

Precision op-amp enables fast multiplexing at low power -  EDN-Design Ideas 04/29/2016    LTC Design Notes: A multiplexed DAQ design presents some subtle challenges, and parts selection plays a crucial role __ Circuit Design by LTC Design Note

Precision Photodiode Amplifier -  The LT1880 provides a high degree of precision with very low bias current (IB = 150pA typical).  Total output offset is below 262mV, worst-case, over temperature (0C to 70C).  With a 5V output swing this implies a minimum 86dB dynamic range. __ Linear Technology/Analog Devices App Note, Mar 22nd 2010

Precision Voltage Controlled Current Source -  The ultra-precise LTC2053 instrumentation amplifier is configured to servo the voltage drop on sense resistor R to match the command VC.  The LTC2053 output capability limits this basic configuration to low current applications. __ Linear Technology/Analog Devices App Note, Mar 31st 2010

Program an Op-Amp Gain Block with a Limited-Adjustability, Monolithic, Solid-State Resistor -  08/21/08 EDN-Design Ideas An op-amp gain block allows a solid-state trimming potentiometer with limited adjustability to trim over the complete input range __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Program Designs single-supply op-amp -  10/26/95 EDN-Design Ideas Mathematically, there is no difference between single- and dual-supply op-amp designs, except for the signal reference.  Dual-supply designs inherently reference signals to ground.  However, you must use biasing to reference signals to ground in a single-supply design, because the signals are inherently referenced to VCC/2.  This requirement for external bias schemes complicates the design procedure.  The Basic program, which you can download from. __ Circuit Design by Ronald Mancini and Dave Culver, Harris Semiconductor, Melbourne, FL

Provide Inverting/Noninverting Gain -  11/09/95 EDN-Design Ideas The amplifier in Figure 1a is a well-known circuit that provIdeas voltage gain of +1 or 1, depending on the logic voltage (0 or 5V) you apply to the MOSFET gate.  By adding one resistor (Figure 1b), the amplifier can provide gain of +AV or AV with the same logic control.  The gain is R3/R2, and R1 is (R3R2)/(R3R2.).  You need a driving source with low output impedance, and the input impedance of the circuit is different for the two states. __ Circuit Design by    Victor Koren, Orckit Communications Ltd  Tel Aviv, Israel

Provide linear I-to-V conversion -  01/18/96 EDN-Design Ideas The circuit in Figure 1 provIdeas a 4to 20-mA voltage-to-current conversion for noise-immune data transmission in industrial data-acquisition systems.  The circuit supplies two voltages to the inverting input of the control amplifier IC1A.  The first voltage, from the follower IC1B, introduces an offset in the transfer function of the circuit __ Circuit Design by Jordan Dimitrov, N Pouskarov Institute, Sofia, Bulgaria

PWM uses one Op Amp -  07/06/00 EDN-Design Ideas A previous Design Ideas is reminiscent of a similar but somewhat simpler circuit (see "Low-power PWM circuit is simple, inexpensive," EDN, Jan 6, 2000, pg 119).  This circuit delivers a rectangular signal with duty cycle varying between 0 and 100% in response to an input signal varying from 0 to 5V dc (Figure 1).  As with the above-mentioned circuit, the frequency is not constant (Figure 2), but the circuit is so simple that it can be useful in certain applications. __ Circuit Design by Ferran Bayes, Electronica Digital, Barcelona, SpainJuly 6, 2000


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


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