Very Low DC Offset Wideband Amplifier

The OPA380 is an integrator- stabilized operational amplifier that was developed primarily for transimpedance amplifier applications. Its inverting input is that a 90MHz CMOS op amp but its non-inverting input is an integrator non-inverting input, allowing only very low frequency response through this input. In most dual- supply applications, the OPA380 non- inverting input is simply tied to ground. In single- supply applications, it can be used to provide a DC offset. By adding an input resistor, R1, a transimpedance amplifier is transformed into a conventional inverting amplifier. The usual op amp inverting gain equation  applies: Av = – (R2/R1) in V/V. The OPA380 is input offset voltage is specified as 4uV typical, 25uV maximum @ 25C, drift is 0.03uV/C typ, 0.1uV/C max.  (Circuit is created by Neil P. Albaugh  TI- Tucson)

 Very Low DC Offset Wideband Amplifier circuit:

 Low vos wideband amplifier

Online Simulation of the Very Low DC Offset Wideband Amplifier Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

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