Patent Number: 6,297,670

Title: Single-ended sense amplifier with adjustable noise margin and power down control

Abstract: The present invention discloses a single-ended sense amplifier including an output circuit having an output terminal for indicating a state of a bitline node. In addition, a noise margin circuit; and an n-channel transistor are provided for coupling or decoupling an input terminal of the output circuit with the bitline node. The variable logic-threshold inverter has a larger logic threshold voltage in response to a lower voltage level of a precharge signal and a smaller logic-threshold voltage in response to a higher voltage level of the precharge signal. The difference between the two logic-threshold voltages represents the possible noise margin. Furthermore, a power down control circuit is provided to be coupled to the bitline node for reducing the static power consumption of the single-ended sense amplifier. The single-ended sense amplifier according to the present invention provides a higher and adjustable noise margin and occupies a smaller area on a semiconductor wafer.

Inventors: Chao; Chin-Chieh (Hsinchu, TW), Yang; Tsen-Shau (Hsinchu, TW), Tso; Keh-Yung (Hsinchu, TW)

Assignee: Century Semiconductor, Inc.

International Classification: G11C 7/06 (20060101); G01R 019/00 (); G11C 007/00 (); H03F 003/45 ()

Expiration Date: 10/02/2018