HIGH VOLTAGE FET DEVICE WITH VOLTAGE SENSING

摘要

A high voltage FET device provides drain voltage information with less overall silicon area consumption by forming a spiral resistance poly structure over a drift region of the high voltage FET device. The spiral resistance poly structure has an inner most end coupled to a drain region, and an outer most end coupled to a reference ground.

主权项

1. A high voltage FET device with voltage sensing, comprising:
a substrate of a first doping type; an epitaxial layer formed over the substrate; a source-channel region of a second doping type formed in the epitaxial layer; a drain region of the second doping type formed in the epitaxial layer; a drift region of the second doping type formed between the source-channel region and the drain region; a connection region of the first doping type formed in the epitaxial layer; a connection pickup region of the first doping type formed in the connection region; a connection electrode contacted with the connection pickup region; a source pickup region of the second doping type formed in the source-channel region; a drain pickup region of the second doping type formed in the drain region; a source electrode contacted with the source pickup region; a drain electrode contacted with the drain pickup region; a spiral resistance poly structure formed over the drift region, the spiral resistance poly structure having an inner most end coupled to the drain electrode, and an outer most end coupled to a reference ground; and a plurality of taps formed on the edge of the outer most turn of the spiral resistance poly structure, wherein one of the taps is led out to provide a divided down sense voltage indicative of the drain voltage of the high voltage FET device.