1
Chun Foong Cheah: Inclinometer sensing circuitry and operation. Precision Navigation, Donald R Boys, July 4, 1995: US05428902 (15 worldwide citation)

Measurement circuitry for a biaxial inclinometer having electrolytic fluid incorporates a Schmitt trigger for measuring the resistance of each leg of the inclinometer by measuring the frequency output of the Schmitt trigger circuit while each leg is placed across input and output terminals. Switchin ...


2
Nick M Johnson, Chun Foong Cheah: IC for producing an output voltage related to fuel composition in a capacitive fuel sensor. August 30, 1994: US05343156 (5 worldwide citation)

A circuit for responding to the output of a capacitive fuel sensor that can distinguish gasoline from methanol and produces an output that is related to the methanol proportion. The response is independent of the conductivity in the sensor resulting from fuel contamination. A square wave is employed ...


3
Chun Foong Cheah, Timothy J Skovmand: Transient protected isolator output stage. National Semiconductor Corporation, Gail W Woodward, Michael A Glenn, James W Rose, November 19, 1991: US05066901 (4 worldwide citation)

An automotive voltage regulator is disclosed to have plural regulated outputs using a transient protected isolator output stage (TPIOS) that prevents a system fault condition on any one output from adversely affecting the other outputs. In an automotive environment employing a nominal 14-volt supply ...