Abstract: The synchronized transformer-coupled power supply circuit includes a transformer 20; an input power signal coupled to a primary winding 22 of the transformer 20; voltage regulators 48-53 coupled to secondary windings 24 and 26 of the transformer 20; and a start-up circuit 10 for coupling the input power signal directly to one of the voltage regulators 48-51 until the transformer 20 reaches a desired operating level.

Abstract: An image array with improved dynamic range has at least one photosite, at least one column sense line and at least one column clamp transistor. A source of the photosite is coupled to the column sense line. A source of the column clamp transistor is coupled to the photosite source. A drain of the column clamp transistor is coupled to a drain of the photosite. A gate of the column clamp transistor is provided for application of a .phi..sub.cc signal. The .phi..sub.cc signal is coupled through a capacitance to the column sense line.

Abstract: The dynamic range of an image array photosite is improved by, first, turning on a column clamp transistor having a source coupled to a photosite transistor source and a drain coupled to a photosite transistor drain, wherein the column clamp transistor is turned on by a column clamp transistor gate voltage; then decreasing a current supplied to a column sense line below a quiescent value, wherein the column sense line is coupled to the photosite transistor source; then turning on the photosite transistor by a photosite transistor gate voltage; then turning off the photosite transistor and the column clamp transistor at substantially the same time; then increasing the current above the quiescent value; and then returning the current to the quiescent value.