Patent ID: 6667898
Filing Date: 2003-12-23
Classification: G11C

Abstract:
A method for measuring a bias voltage of plural sense amplifiers in a memory device, wherein each of said plural sense amplifiers is electrically connected with a memory cell module, comprising steps of:selecting said plural sense amplifiers as a measurement area; writing a midlevel voltage into said respective memory cell modules connected to said plural sense amplifiers respectively; providing a reference voltage of said midlevel voltage into said plural sense amplifiers in said measurement area; recording output signals of said plural sense amplifiers, wherein said output signal is valued one of â€œ0â€  and â€œ1â€ ; counting numbers of â€œ0â€  and â€œ1â€ , and obtaining a ratio of said number of â€œ0â€  over said number of â€œ1â€ ; and obtaining said bias voltage of said plural sense amplifiers in said measurement area as said ratio.