Low-noise circuit design requires careful analysis of all noise sources. External noise sources can dominate in many cases; consider the effect of source resistance on overall op amp noise performance. Total noise of the circuit is the root-sum-square combination of all noise components.

The resistive portion of the source impedance produces thermal noise proportional to the square root of the resistance. This function is plotted in Figure 7-1. The source impedance is usually fixed; consequently, select the op amp and the feedback resistors to minimize the respective contributions to the total noise.

Figure 7-2 illustrates both noninverting (A) and inverting (B) op amp circuit configurations with gain. In circuit configurations with gain, the feedback network resistors also contribute noise. In general, the current noise of the op amp reacts with the feedback resistors to create additional noise components. However, the extremely low current noise of the OPAx145 means that the current noise contribution can be neglected.

The feedback resistor values can generally be chosen to make these noise sources negligible. Low impedance feedback resistors load the output of the amplifier. The equations for total noise are shown for both configurations.

Where: e_N is the voltage noise of the amplifier. For the OPAx145 operational amplifier, e_N = 7 nV/√Hz at 1 kHz.

Where: i_N is the current noise of the amplifier. For the OPAx145 operational amplifier, i_N = 0.8 fA/√Hz at 1 kHz.

NOTE: For additional resources on noise calculations visit TI's Precision Labs Series.

Figure 7-2 Noise Calculation in Gain Configurations