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DiffAmpCalc is an interactive design and parametric simulation tool for fully differential amplifiers, which are used to drive high performance ADCs. Using the DiffAmpCalc tool the design process requires only four easy steps; select the amplifier, choose a topology, specify the gain, and specify the input voltages. Once a functional design is complete, the user can optimize the design dynamically for key system specifications such as input and/or output dynamic range, power dissipation, supply voltages, bandwidth, noise and distortion. When high differential gain is needed, the diff-amp calculator enables the user to connect multiple stages of differential amps and evaluate and optimize multi-stage designs. The Diff-Amp Calculator opens up in an XGA size window that is movable, can be minimized and closed from the window, but cannot be resized. The window is divided into four areas. The menu bar provides the session save, recall, delete and print functions and access to a help file. Setup parameters are clustered in three groups, located along the top of the form. The resistor tolerances menu box allows the user to select between no tolerance, “none”, and one of four common tolerances. With “none” selected, the user can change the value of Rg using the ALT + UP/DOWN key combinations on the keyboard. The value of Rg is restricted to three significant figures, for example, 12.5 Ω or 125 Ω or 1.25 kΩ. With any of the tolerances selected change the value of Rg using the arrows; increase by clicking on the right arrow, decrease by clicking on the left arrow. To choose a topology in the menu box, select single ended or differential input configuration and terminate/un-terminate in either input configurations. AC couple inputs using one of two methods. AC Coupled1, available for terminated input configuration only, provides DC isolation between the termination resistor and the source. AC Coupled2 is available for both terminated and un-terminated configurations. It provides DC isolation between Rg and the termination resistor(s).
