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OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, …
https://www.ti.com/lit/ds/symlink/opa1656.pdf
OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers 1 Features • Ultra-low noise: – Voltage noise: 2.9 nV/√Hz at 10 kHz – Current noise: 6 fA/√Hz at 1 kHz • Low distortion: – 0.000029% (–131 dB) at 1 kHz – 0.000035% (–129 dB) at 20 kHz • High open-loop gain: 150 dB • High output current: 100 mA • Low input bias current: 10 pA
Ultra low distortion composite amplifier kits TDA7293 TDA794
https://www.kaltecs.com/tda7293-composite-amplifier/
The function of the preamp is to ensure gain of 2 and provides a possibility to invert the input signal in case we want to use the amplifier in BTL configuration. The preamp defines the bandwidth (4-5Hz to 150kHz) as well. To ensure low distortion and low noise floor U1 needs to be a high performance op amp.
MAX4108 400MHz, Ultra-Low-Distortion Op Amps | …
https://www.maximintegrated.com/en/products/analog/amplifiers/MAX4108.html
An ultra-low-distortion design provides an unprecedented spurious-free dynamic range of -93dBc (MAX4108) at 5MHz (V OUT = 2V P-P, R L = 100Ω), making these amplifiers ideal for high-performance RF signal processing. These high-speed op amps feature a wide output voltage swing and a high-current output-drive capability of 90mA.
OPA1656 data sheet, product information and support | …
https://www.ti.com/product/OPA1656
The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. The FET-input architecture achieves a low 2.9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety of circuits.
Ultra Low Distortion Audio Composite Amplifier Kit LM1875
https://www.kaltecs.com/lm1875-composite-amplifier/
Ultra Low Distortion Composite amplifiers based on LM1875. LM1875 is a little nice chip amp capable of providing 25W output power. If properly implemented it provides surprisingly good sound. The simplicity of the circuit and its sound quality have ranked that IC chip among the most popular among DIY enthusiasts.
OPA2134 Op-Amp IC: Datasheet, Pinout, Replacement, Circuit ...
https://www.easybom.com/blog/a/opa2134-op-amp-ic-datasheet-pinout-replacement-circuit-examples
The OPA134 series of operational amplifiers are ultra-low distortion, low-noise devices designed specifically for audio applications. To provide superior sound quality and speed for exceptional audio performance, a true FET input stage is included.
An ultra low-distortion oscillator with THD below -140 dB
http://www.janascard.cz/PDF/An%20ultra%20low%20distortion%20oscillator%20with%20THD%20below%20-140%20dB.pdf
2. LME49710 became obsolete now and a new champion between ultra-low distortion amplifiers OPA1656 came, so the PCB was redesigned to fit OPA1656. The data-sheet of OPA1656 [7] specifies that higher harmonics are lower than 160 dB for frequencies below 2 kHz. Unfortunately, there is no description of how that distortion was measured.
Ultra Low Distortion Composite Amplifiers Based on TDA7293 ...
https://www.diyaudio.com/community/threads/ultra-low-distortion-composite-amplifiers-based-on-tda7293-94.379506/
When the distortion of an op amp is lower then -125dB they classify it as "ultra low distortion". The power amps are different animal. A few years ago when I first built the prototypes of that composite and measured the distortion I got so impressed that I made a small survey trying to determine the lowest THD boundary of power amps.
Low Noise Op Amps (≤ 10nV/√Hz) - Analog Devices
https://www.analog.com/en/products/amplifiers/operational-amplifiers/low-noise-op-amps-lessthanequalto-10nv.html
Low Noise Op Amps (≤ 10nV/√Hz) Analog Devices’ portfolio of low noise (≤ 10nV/√Hz) op amps includes many amps with the lowest noise performance in the industry. These high speed, low distortion (1 nV or less) op amps enable better signal fidelity in the most demanding conditions, allowing system designers to achieve the lowest total system noise performance in …
LT1115 Datasheet and Product Info - Analog Devices
https://www.analog.com/en/products/lt1115.html
The LT1115 is the lowest noise audio operational amplifier available. This ultralow noise performance (0.9nV/√Hz at 1kHz) is combined with high slew rates (>15V/µs) and very low distortion specifications.The RIAA circuit shown below using the LT1115 has very low distortion and little deviation from ideal RIAA response (see graph).Applications Hi
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