Tritech Microelectronics International Ltd.

Kok Chin Chang

A current reference circuit for use in a memory sense amplifier is described, which generates a mid-point current reference that is insensitive to fabrication process variations. This circuit is also robust enough to handle distinctly different levels of '0' and '1' sense currents without causing clipping of the mid-point reference current. Adequate sensing levels for the bit line sense amplifier are thus ensured.

Current reference circuit for current-mode read-only-memory

A circuit for turning off an indicator light operates in two phases that provide a first rapid discharge phase and a second slow discharge phase. This sequence dims the light in a visual approximation of the exponential dimming that occurs with lights that operate with power supplies that have capacitors that give a slow turn off. The preferred light is an electroluminescent element that will be called a glow-effect capacitor which stores sufficient charge for slow turn off. When a switch associated with the light is opened, an FET turns on to discharge the capacitor rapidly to a selected voltage. This FET is then turned off and other components discharge the capacitor slowly. The switching signal for this FET is formed as a logic function of the switch position (open or closed) and the occurrence of the selected voltage level on the glow-effect capacitor.

Growing community of inventors

Singapore, Singapore

Kok Chin Chang