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Amplifier Circuits:  Low Noise Circuits
Amplifier -- Main Page

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

Last Updated: November 30, 2017 10:27 AM

Circuits Designed by Dave Johnson, P.E. :
Light Receiver Amp-40Khz -  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. . . . Hobby Circuit designed by Dave Johnson P.E.-March 7, 2002 

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

Large Area Photodiode Bootstrapping -  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.  The addition of a low noise JFET__ Linear Technology/Analog Devices App Note, Mar 16th 2010

Light Receiver Amp-40Khz -  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. . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002

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

Low Noise 12V Power Supply from a Single-Ended 15V Input Supply -  The LTC3260 is a low noise dual polarity output power supply that includes an inverting charge pump with both positive and negative LDO regulators.  The charge pump operates over a wide 4.5V to 32V input range and can deliver up to 100mA of output current.  Each LDO regulator can provide up to 50mA of output current.  The negative __ Linear Technology/Analog Devices App Note, Apr 19th 2012

Low Noise 1M Trans-Impedance Amplifier -  By using a 10Megaohm resistor, with a noise of 400nV/rtHz, for transimpedance gain and then attenuating the signal by 10 results in an equivalent gain of 1Megaohm with only 40nV/rtHz of noise.  This is less than 1/3 the noise of a single stage TIA with a 1Megaohm resistor.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low Noise AC Amplifier with Programmable Gain & Bandwidth -  Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words.  The Gain Control PGA simply varies the circuit gain from 1 to 100.  The Bandwidth Control PGA puts signal gain inside the feedback loop of the amplifier.  As this gain is increased the effective value of feedback resistor R2 is decreased.  This pushes out the upper low pass corner frequency of the ac amplifier.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low Noise AC Difference Amplifier -  Piezoelectric and LVDT  (Linear Variable Differential Transformer) sensors provide differential ac output signals.  In addition to a standard difference amplifier a secend amplifier can be used as a dc servo amplifier to force an output dc bias potential in single supply applications.  This difference amplifier is dc coupled but __ Linear Technology/Analog Devices App Note, Mar 16th 2010

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 __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Low Noise Audio Power Supply -  App Note #169__ Maxim Integrated

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

Low Noise Fully Differential Buffer/Amplifier -  Useful in RFID baseband signal processing is a differential amplifier with an input impedance set to match the differential output impedance of a RF demodulator.  The differential input impedance is 2*Rin and the gain is Rg/Rin.  Capacitors Cf and Cin can be used to set the bandwidth of the amplifier.  For DC biasing the common __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier -  A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low Noise Low Ripple Triple Output Supply Providing 1V, 8A & 1.8V, 5A & 1.5V, 3A -  The LT3070 is a low voltage, UltraFast transient response linear regulator.  The device supplies up to 5A of output current with a typical dropout voltage of 85mV.  A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS.  The LT3070s high bandwidth permits the use of low ESR ceramic capacitors, saving__ Linear Technology/Analog Devices App Note, Apr 22, 2011

Low Noise Microphone Preamplifier -  This is a design for a low noise microphone preamplifier, which is ideally suited to low impedance  (600 Ohm nominal) microphones.  One limitation is that it is not balanced, which is not a problem in a home recording environment, but will allow the mic lead  (and case) to pick up noise with long cable runs or in a hostile environment.   __ Designed by Rod Elliott  ESP

Low Noise Micropower DC/DC Converters LT1500/LT1501 -  DN151 Design Notes__ Linear Technology/Analog Devices

Low Noise Non-Inverting Shock Sensor Amplifier -  The shock sensor charge is converted to a voltage and amplified with a precision resistor ratio for gain accuracy.  Paralleling amplifiers reduces noise.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low Noise Single Supply Photodiode Amplifier -  Low Noise Single Supply Photodiode Amplifier Figure 1 shows the LTC6252 applied as a high performance transimpedance amplifier for a photodiode.  A low noise JFET acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1.  Transimpedance gain is set by feedback resistor R1 to 1MΩ.  R4 and __ Designed by Glen Brisebois-Applications Engineer-Linear Technology/Analog Devices App Notes, Feb 4th 2013

Low Noise Varactor Biasing with Switching Regulator -  AN85 Telecommunication, satellite links and set-top boxes all require tuning a high frequency oscillation.  The actual tuning element, a varactor diode, requires high voltage bias for operation.  The high voltage bias must be free of noise to prevent unwanted oscillator outputs__ Linear Technology/Analog Devices

Low Noise, Low Power Photodiode Amplifier -  Low Noise, Low Power Photodiode Amplifier is Better than Monolithics.  Low Bias Current, Low Current Noise and Unity Gain Stability Keep the Circuit Operational from 0ohm to several Gohm.  Amplifier input noise density and gain-bandwidth product were measured to be 2.4nV/rtHz and 100MHz, respectively, with only 3.8mA supply__ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low Noise, Wideband, Gain = 100 Amplifi er with High Input Impedance -  Averaging of three identical input stages reduces random noise addition by √3.  Each input stage has a gain of about 10.2, and the second stage adder is trimmed for an accurate overall 100x.  __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Low Offset Summing Amplifier -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Low-Noise (1.5nV/√Hz) fully differential 1.6GHz buffer drives 50Ohm load -  08/19/12  EDN Product Brief   The LTC6417 from is a fully differential buffer amplifier with only 1.5nV/√Hz output-referred noise.  The LTC6417 from is a fully differential buffer amplifier with only 1.5nV/√Hz output-referred noise.  The LTC6417 is capable of driving a differential 50Ohm load and is optimized for driving 14- and 16-bit pipeline ADCs.  It can be DC- or AC-coupled at its inputs, and achieves excellent distortion performance for signals up to and beyond 600MHz.  At 140MHz, OIP3 is 46dBm, and HD3 is -69dBc with 2.4 VP-P output swing into a 50Ohm load.   __ Circuit Design by LTC6417 from Linear Technology

Low-Noise AC Amplifier has digital control of gain & 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- __ Circuit Design by Philip Karantzalis, Linear Technology App Note, Milpitas, CA,

Low-Noise PIN diode laser receiver -  This article will describe a simple low noise PIN diode front end suitable for laser communications.  Two schematics are presented, one for nighttime use and one for daylight use.  Although it may be possible to add switching to the front end to allow one front end to work for both night and day I decided against this due to the extremely high impedance involved and degradation associated with loading on the PIN diode. __ Designed by John - K3PGP

LT1169 Low Noise Hydrophone Amplifier with DC Servo -  The LT1169 achieves a new standard of excellence in noise performance for a dual JFET op amp.  For the first time low voltage noise  (6nV/rtHz) is simultaneously offered with extremely low current noise  (1fA/rtHz) , providing the lowest total noise for high impedance transducer applications.  Unlike most JFET op amps, the__ Linear Technology/Analog Devices App Note, Jun 21, 2011


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


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