Simulation is a particularly effective way to design and test high-frequency circuits. Increasingly powerful computers and the wide use of the circuit simulator, PSpice®, make simulation with PSpice a practical method to test the various parameters of a circuit. Good simulation models are essential, however, to achieve realistic results. Burr-Brown now offers PSpice models for a number of new RF circuits that far exceed the usual simulation standards in scope and details. The macromodel for the Diamond Transistor OPA660 gives an example of t