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Amplifier Circuits:  Low Noise Circuits
Amplifier -- Main Page

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

Last Updated: June 02, 2021 01:44 PM

Circuits Designed by Dave Johnson, P.E. :
40Khz Light Receiver Amp -  This circuit is similar to 30KHZ LIGHT RECEIVER AMP  but provides more gain and operates up to 40KHz.  However it draws more power supply current.. . . Circuit by Dave Johnson P.E.-March 7, 2002

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

20-36Vin to 12VoutAT16A 2-Phase Low Noise EN55022B Compliant uModule Power Supply -  The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply.  Included in the package are the switching controller, power FETs, inductor and all support components.  Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range of 3.3 V to 15V, set by a single external resistor.  Only bulk input and output capacitors are needed to finish the design__ Linear Technology/Analog Devices App Note, Apr 25th 2011

2m (144MHz) Dual Gate FET Low Noise Amplifier -  My good old FT-290 2m SSB and FM radio, had about 1uV sensitivity before installing this amp. 
Now it is 150nV just like the best radios I have tested.  Stations I could hear with noise, are now loud and clear !! __ Designed by Thomas Scherrer OZ2CPU


40Khz Light Receiver Amp -  This circuit is similar to 30KHZ LIGHT RECEIVER AMP  but provides more gain and operates up to 40KHz.  However it draws more power supply current.. . . Circuit by Dave Johnson P.E.-March, 2002

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

4-20mA Loop Transmitter -  Transmission of industry standard 4-20mA current loop signals to values and other actuators is a common requirement.  Resistive line losses and actuator impedances require current transmitters to be able to force a compliance voltage of a least 20V.  Because of this, 5V powered systems usually cannot meet current loop transmitter __ Linear Technology/Analog Devices App Note, Mar 16th 2011

700kHz, 1MΩ Single Supply Photodiode Amplifier -  The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth.  Supply current was a low 2.2mA.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Balanced Low Noise Microphone Preamp -  A discrete front end makes this balanced microphone preamp very quiet __ Designed by Rod Elliott  ESP

Composite Amplifier Improves Noise -  08/04/94 EDN-Design Ideas -  Amplifying low-signal levels for signal processing often stretches a single op amp's abilities.  A composite design can improve the input noise for detecting extremely small signals and can enhance output-drive ability.  Both the  Design by Rea Schmid, Comlinear Corp, Fort Collins, CO

Composite Amplifiers -  AN21 Applications often require an amplifier that has extremely high performance in several areas.  For example, high speed and DC precision are often needed.  If a single device cannot simultaneously achieve the desired characteristics, a composite amplifier made up of two  (or more) devices can be configured to do the job.  AN21 shows examples__ Linear Technology/Analog Devices

Curiously Low Noise Amplifier -  The Curiously Low Noise Amplifier takes advantage of the wonderful noise characteristics of the 2SK117 JFET that boasts a noise voltage below 1 nV/root-Hz and virtually no noise current.  The noise voltage of the amplifier is only 1.4 nV/root-Hz at 1 kHz, increasing to only 2.7 nV/root-Hz at 10 Hz.  The noise current is difficult to measure, so this simple utility amplifier can see the noise from a 50 ohm resistor and a 100k resistor, too.   (The 1.4 nV input-referred noise will increase to about 1.7 nV with a 50 ohm resistor, instead of a short, and a 100k resistor will give an input-referred noise near 40 nV, with very little contribution from the amplifier.)  __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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

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