Patent Number: 7,102,419

Title: Bias generator that automatically adjusts its slew rate

Abstract: A bias generator that automatically adjusts its slew rate is disclosed to generate an output bias current and adjust the output bias current according to the frequency of a clock signal. The slew rate of the amplifier is thus controlled to save power. It includes: a current mirror for receiving a feedback voltage and generating an output bias current; a storage capacitor with a first end and a second end and the latter being coupled to the ground; a charging switch coupled between the output of the current mirror and the first end of the storage capacitor; a discharging switch 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 coupled to the output of the comparator for outputting a feedback voltage to the current mirror.

Inventors: Lou; Chih-Hong (Hsinchu, TW), Liu; Yen-Jen (Hsinchu, TW)

Assignee: Industrial Technology Research Institute

International Classification: G11C 5/14 (20060101)

Expiration Date: 9/05/02018