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Precision Amplifier Circuits

Precision Amplifiers:  #'sM          N - Z 

Last Updated: November 30, 2017 07:37 AM


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

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

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

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

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 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 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

Reduced Power Infra-Red Diode Driver -  Infra-Red LEDs can be used as continuously operating beams of light.  Sensing a break in the path of light between the source and a photodiode receiver is often used in safety and alarm systems.  To extend the run-time of the light source, the diode conducts the minimum current necessary, in this case 10mA.  Controlling the duty __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Saturated Standard Cell Amplifier -  The amplifier is a standard non-inverting gain stage that can be trimmed to any specific output level.  A low-leakage FET is used as a cell disconnect when power is removed. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Single 2.7V to 20V Supply Current Source for 50C to 600C Platinum RTD -  The LT6010 op amp combines low noise and high precision input performance with low power consumption and rail-to-rail output swing.  Input offset voltage is trimmed to less than 35mV.  The low drift and excellent long-term stability guarantee a high accuracy over temperature and over time.  The 110pA maximum input bias current __ Linear Technology/Analog Devices App Note, Mar 30th 2010

Single Supply Current Source for Platinum RTD -  The LT1800's Precision and low bias input stage is used to good advantage in Fig.5 Single Supply Current Source for Platinum RTD circuit.  R4 and C1 stabilize the circuit making it insensitive to cable characteristics.  Output is 1.00V at 0C and its gain factor is 3.85mV/C. __ Linear Technology/Analog Devices App Note, Jul 2nd 2012

Single Supply, Micropower Sample & Hold -  Two op amp buffers, CMOS switches and a low leakage capacitor create a simple sample/hold circuit.  The LT1006 has the ability to speed up response and reduce supply current through pin 8.  When sampling the amplifiers are sped up to acquire signals in just 20us.  When put into hold mode the supply current is throttled back to only 250uA __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Strain Gauge Signal Conditioner with Bridge Excitation -  A buffered 7V reference provides a 5V excitation voltage to a balanced strain gauge resistor bridge.  To provide a 0V output when the bridge is perfectly balanced, a second amplifier biases the bottom of the bridge to a negative compliment of the 5V excitation voltage.  Circuit gain is set such that a 1% bridge resistance imbalance __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Thermally Controlled NiCad Charger -  A voltage controlled current (maximum of 1A) is used to charge a NiCd battery.  The control voltage is derived from the temperature difference between the battery and the ambient air.  The charge current is reduced as the battery heats up. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Thermistor Liquid Flowmeter -  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

Ultra-Precision, Wide Dynamic Range 10Hz Bandwidth Photodiode Amplifier -  The low input bias current and input noise current, combined with low voltage offset, provide a precision signal monitor.  A high degree of input sensitivity is provided to the circuit by the large dynamic range, characterized by low input offset and high DC gain of the LTC2054. __ Linear Technology/Analog Devices App Note, Mar 22nd 2010

Voltage Controlled Current Source with Ground Referred Input & Output -  A flying capacitor device such as the LTC1043 can produce a precision voltage differential over a wide common mode range.  Here it converts a ground referred input voltage directly to a differential voltage across a fixed resistor which then forces a precise current sourced at the circuit output. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Wide Common Mode Range 10x Gain Instrumentation Amplifier -  The LTC6090 is a high voltage precision operational amplifier.  The low noise, low bias current input stage is ideal for high gain configurations.  The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split 70V supplies __ Linear Technology/Analog Devices App Note, Feb 15th 2013


Precision Amplifiers:  #'sM          N - Z 


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