An inkjet printer includes a printhead for ejecting ink onto a print medium.
The
printhead includes electrical and mechanical structure for controlling the ejection
of the ink. The printhead includes an ink ejector chip having at least one active
device, such as a transistor and the like. A guard ring substantially surrounds
select active devices included on the chip. The guard ring tends to prevent latch-up
when the chip operates to energize the ink. The chip is manufactured using a substrate
devoid of an overlying epitaxial layer which tends to reduce the cost of manufacturing
the chip.
