OPA656 is a broadband, unity gain stable, field-effect transistor input operational amplifier 6

Where:

IEQ=Equivalent input noise current when the output noise bandwidth is limited to F<1/(2 π RFCD).

IN=Input current noise of operational amplifier inverter input.

EN=Input voltage noise of operational amplifier.diode

CD=diode capacitor.

F=band limited frequency, measured in hertz (usually post filtered before further signal processing).

At 4kT=290 ° K, it is 1.6E-20J.

For the circuit in Figure 3, this expression is calculated as a feedback pole frequency of 3.8 MHz, and an equivalent input noise current of 2.7 pA/Hz is given. This is much higher than 1.3fA/HZOR, only for the operational amplifier itself. This result is mainly dominated by the last term in the equivalent input noise current expression. In this case, it is very necessary to use a low-voltage noise operational amplifier.diode

design tool

demonstration plant

Two printed circuit boards (PCBs) can be used to assist in the preliminary evaluation of circuit performance using OPA656 in its two packaging options. Both products are provided free of charge as unwanted polychlorinated biphenyls and are delivered with user guides. The summary information of these fixed devices is shown in Table I.diode