Abstract: A gradient amplifier arrangement is described that comprises a gradient amplifier power stage. The device may be employed to provide a current to a gradient coil, as in a MRI system. The circuitry disclosed includes a series coupling of a first bridge amplifier operating at a first voltage, a second bridge amplifier operating at a second voltage, a third bridge amplifier operating at a third voltage, and a gradient amplifier control stage. The amplifiers may provide output voltages at different levels, and may be switched at different times and frequencies to provide a range of output voltage and current levels.

Abstract: A method of evaluating a particular document relating to property includes selecting the particular document from a set of pre-selected documents. Each pre-selected document has associated therewith one or more search linkages that identify how the pre-selected document was selected, using user-supplied inputs, from a larger set of documents relating to property. The method also includes using the one or more search linkages associated with the particular document to determine a relevance factor associated with the document. The method further includes displaying to a user information relating to the document.