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Amplifier Circuits:  Low Noise Circuits
Amplifier -- Main Page
Last Updated on: Tuesday, April 01, 2014 04:28 AM

Circuits Designed by Dave Johnson, P.E. :


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
40kHz Light Receiver Amp -  This circuit is similar to number 121 but provides more gain and operates up to 40KHz. However it draws more power supply current.... [Designed by David A. Johnson]
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.....[Design Idea added 4/02] EDN migrating links. This link is not verified.  Search the "title" EDN for new link.
Composite Amplifiers -  AN21 Linear Technology 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....

Low Cost Very High IP3 Low Noise Amplifiers Cover 250MHz to 2300MHz -  Application Note MiniCircuits.com  (app note added 04/05/06)
Low Noise Amplifier for 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.... (added 7/03)
Low Noise Balanced Microphone Preamp -  A discrete front end makes this balanced microphone preamp very quiet, and it has excellent noise rejection.  Since the SSM2017 has been discontinued (sad but true), and if you can't get the INA217 this may be the ideal replacement…(added 7/03)
Low Noise Microphone PreAmplifier -  Simple unbalanced design, suitable for microphones, very low noise  (electronic circuit added 7/03)
Low-noise ac amplifier has digital control of gain and bandwidth -  02/05/04 EDN-Design Ideas  In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum.... [Design Idea by Philip Karantzalis, Linear Technology, Milpitas, CA,
Quasiresonant converter uses a simple CMOS IC -  15-Apr-04 Issue of EDN  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 create high di/dt, which is the main cause of noise. The converter in Figure 1 (pg 76] has a low noise level, because it slowly switches current on at nearly zero.... [Design Idea by Francesc Casanellas, Aiguafreda, Spain]
Ultra-low-noise low-dropout regulator achieves 6-nV/√Hz noise floor -  23-Jun-05 Issue of EDN  LDO has ultralow-noise output.... [Design Idea by By Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA; Edited by Brad Thompson and Fran Granville]
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.... (added 7/03)
 

 
 


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