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Amplifier Circuits:  Low Noise Circuits
Amplifier -- Main Page

Low Noise Circuits:   #'s -K      L     M -Z

Last Updated: October 09, 2017 03:39 PM


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

OR Gates Slash Noise Coupling In Digital Potentiometer Applications -  Digital potentiometers are extremely useful and gaining wide acceptance for controlling parameters in analog circuits.  The figure shows an example circuit that uses a digital pot to change the gain of an operational amplifier __ Designed by Michael Gambuzza

Paralleling Amplifiers to Reduce Noise -  In high gain circuits noise reduction is an important consideration.  Paralleling four amplifiers will reduce the total noise of the circuit by a factor of two.  The output noise of each amplifier, enOUTx, is attenuated by four and summed at the output terminal.  Since noise from uncorrelated sources is summed in RMS fashion the __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Phase Noise Measurements -  The phase noise of low noise oscillators and signal sources is usually determined by measuring the audio noise voltage at the output of the phase comparator in a phase-locked loop.  The phase comparator is typically a low noise doubly-balanced mixer with a phase slope from a few tenths of a volt per radian to a few volts per radian.  The low __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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 sensor’s open circuit voltage.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Quasiresonant converter uses a Simple Circuit CMOS IC -  04/15/04  EDN-Design Ideas - Figure 1 shows a flyback power supply that has low noise and uses a simple CMOS 4093 IC for its control.  The electrical noise of a converter arises mainly when current switches on.  Diode recovery and charging parasitic capacitances __ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Reference Buffer -  The control voltage, Vin, is converted to a charge on a capacitor that is referenced to ground.  This charge is transferred to place a differential voltage across the output current programming resistor.  The output current then flows into a ground referenced load for a precision single supply circuit without the need for a voltage __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Single Ended Input-Differential Output Amplifier -  A dual amplifier package can is configured to convert a single ended ground reference input signal to a differential output signal.  Low bias current allows for a high input impedance of 200Kohm and the tight offset matching of the amplifiers provides a differential output dc offset of only 40uV.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Single Supply, 1.5nVrtHz, Photodiode Amplifier -  Simple, fast, low noise photodiode amplifier.  Amplifier input noise density and gain-bandwidth product were measured to be 1.5nV/rtHz and 157MHz, respectively, while consuming only 100mW.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Small Area Photodiode in Normal TIA Configuration -  Small area photodiodes have low capacitance.  To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise.  The total input capacitance from the amplifier in this circuit is the__ Linear Technology/Analog Devices App Note, Mar 16th 2010

Sub-Microamp RMS Current Measurement for Improved 32kHz Quartz Crystal Performance-LT1028, LT1202, LTC1563-2, LTC1968, LT1077 -  Quartz crystal RMS operating current is critical to long-term stability, temperature coefficient and reliability.  Accurate determination of RMS crystal current, especially in micropower types, is complicated by the necessity to minimize introduced parasitics, particulary capacitance, which corrupt crystal operation.  This video __ Linear Technology/Analog Devices App Note, Jim Williams-Staff Scientist Jun 15th 2008

Super Low Distortion Variable Sine Wave Oscillator -  The LT1028  (gain of –1 stable) /LT1128  (gain of +1 stable) achieve a new standard of excellence in noise performance with 0.85nV/rtHz 1kHz noise, 1.0nV/rtHz 10Hz noise.  This ultralow noise is combined with excellent high speed specifications  (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128) , distortion-free __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Ultra-Low Noise 1Mohm 150kHz Photodiode Amplifier -  The low current noise of the LTC6242 makes the noise of this circuit dominated by the 1Mohm resistor used to convert the photodiode current to a voltage.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Ultra-low-noise low-dropout regulator achieves 6-nV/√Hz noise floor -  06/23/05  EDN-Design Ideas - LDO has ultralow-noise output __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Very High IP3 Low Noise Amplifiers Cover 250MHz to 2300MHz -  Application Note__ MiniCircuits.com

Very Low Noise Amplifier -  The phase noise of low noise oscillators and signal sources is usually determined by measuring the audio noise voltage at the output of the phase comparator in a phase-locked loop.  The phase comparator is typically a low noise doubly-balanced mixer with a phase slope from a few tenths of a volt per radian to a few volts per radian.  The low __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Very Low Noise Large Area Photodiode Amplifier -  Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger.  This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies.  AC coupling a bootstrap JFET across__ Linear Technology/Analog Devices App Note, Mar 16th 2010

Wide Bandwidth Photodiode Amplifier -  Wide bandwidth performance from a small photodiode requires minimizing the total input capacitance.  In this circuit the amplifier's differential input capacitance is bootstrapped by the feedback with R1 and R2.  Choosing the amplifier input that is at the corner of the package for the dual LTC6244 also minimizes pin-to-pin capacitance.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010


Low Noise Circuits:   #'s -K      L     M -Z

 


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