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Amplifier Circuits:  Low Noise Circuits
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Low Noise Circuits:   Next Page

Last Updated on: Monday, March 09, 2015 04:12 AM

Circuits Designed by Dave Johnson, P.E. :

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

20-36Vin to 12Vout  AT  16A 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 3.3V to 15V, set by a single external resistor. Only bulk input and output capacitors are needed to finish the design… [Linear Technology App Note, Apr 25th 2011]

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 App Note, Mar 16th 2011]

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]

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 App Note, Mar 16th 2010]

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 App Note, Mar 22, 2010]

Composite Amplifier Improves Noise- 08/04/94 EDN-Design Idea   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 …

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…

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 App Note, Mar 16th 2010]

Light Receiver Amp - 40Khz- This circuit is similar to number 121 but provides more gain and operates up to 40KHz. However it draws more power supply current… [Hobby Corner Circuit by Dave Johnson]

Low Cost Very High IP3 Low Noise Amplifiers Cover 250MHz to 2300MHz- Application Note MiniCircuits.com  (app note added 04/05/06) …

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 App Note, Mar 16th 2010]

Low Noise AC Amplifier with Programmable Gain and 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 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 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…

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…

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 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 App Note, Mar 22, 2010]

Low Noise Low Ripple Triple Output Supply Providing 1V, 8A and 1.8V, 5A and 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 LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving… [Linear Technology App Note, Apr 22, 2011]

Low Noise Microphone PreAmplifier- Simple unbalanced design, suitable for microphones, very low noise …

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 App Note, Mar 16th 2010]

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 App Note, Mar 22, 2010]

Low Noise, Low Power Photodiode Amplifier With DC Precision- Instead of simply grounding the LT6202 noninverting input, an LTC2050 drives it (and therefore the source) exactly to where it needs to be for zero JFET gate voltage. Output offset is 200mV and output noise is 2mVP-P measured in a 20MHz bandwidth. … [Linear Technology 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 App Note, Jun 21, 2011]

Low Offset Summing Amplifier- Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 63/06) …

Low-noise AC amplifier has digital control of gain and bandwidth- 02/05/04 EDN-Design Idea  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-… [Design Idea by Philip Karantzalis, Linear Technology App Note, Milpitas, CA,

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