Patent ID: 7102419
Filing Date: 2006-09-05
Classification: G11C

Abstract:
1. A bias generator that automatically adjusts its slew rate for generating an output bias current and adjusting the output bias current according to the frequency of a clock signal, comprising: a current mirror, which receives a feedback voltage and generates the output bias current; a storage capacitor, which has a first end and a second end, said second end is coupled to the ground; a charging switch, which is coupled between the output of the current mirror and the first end of the storage capacitor; a discharging switch, which is coupled between the first end of the storage capacitor and the ground; a comparator, whose input is coupled to the first end of the storage capacitor and a reference voltage; and a feedback unit, which is coupled to the output of the comparator for outputting the feedback voltage to the current mirror; wherein the charging switch and the discharging switch are controlled by the clock signal; when the charging switch is on and the discharging switch is off, the current mirror charges the storage capacitor; and when the charging switch is off and the discharging switch is on, the storage capacitor discharges.