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For example, the LT6018 noise power (measured at 1 KHz) is only 1 zeptowatt. Good op amps will have lower noise power than this.
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Resistors, therefore, have a noise power of 17 zeptowatts. This noise can also be considered as a Norton equivalent current noise: i n = e n /R = 0.13/√R nA/√Hz. At a temperature of 300K, the voltage-noise density of any resistor is e n = 0.13 √R nV/√Hz. Resistors inherently have noise proportional to the square root of the resistance value. 2, other noise sources come into play, with incoherent sources combining as a root sum of squares.įirst, consider resistors as noise sources. 1: LT1028- and LT6018-integrated voltage noise.īut there is more to designing low-noise circuits than choosing the lowest-voltage-noise density (e n ) amplifier for a given frequency band. So the LT6018 is the lower-noise choice for lower-frequency applications, while the LT1028 provides better performance for many wideband applications, as shown in Fig. It wasn’t until this year that a new amplifier, the LT6018, challenged the LT1028’s position with 0.1- to 10-Hz input voltage noise of 30 nV P-P and a 1-Hz 1/f corner frequency, although its wideband noise is 1.2 nV/√Hz. For over 30 years, it has remained the lowest-voltage-noise op amp available at low frequency with 0.85-nV/√Hz input voltage noise density at 1 kHz and input voltage noise of 35 nV P-P over 0.1 to 10 Hz. What, then, should we make of low 1/f noise op amps?īack in 1985, George Erdi of Linear Technology designed the LT1028. But we expect successive generations of amplifiers to be better than the previous ones. The realities of physics prevent any of us from attaining the ideal op amp with perfect precision, zero noise, and infinite open-loop gain, slew rate, and gain-bandwidth product. & GLEN BRISEBOIS, Senior Applications Engineer, BY BRIAN BLACK, Product Marketing Manager,