Low-power wordline voltage generator for low-voltage flash memory

Abstract

Wordline voltage generating circuit with high speed active mode and low power standby mode is proposed. In the active mode, two different ring oscillators with high clock frequency (f(CLK)) 170MHz, and low clock frequency (f(CLK)) 25MHz which is also the operating frequency of the entire circuit, are employed. The proposed circuit has a short response time of 3 mu s typically in active mode, and very low standby current about 3 mu A in standby mode.