Patent ID: 6704384
Filing Date: 2004-03-09
Classification: G11C,H03L

Abstract:
A phase adjusting circuit comprising a differential amplifier receiving an external input signal and having a controllable current source, a delay means for delaying an output signal of said differential amplifier by a predetermined length of time, a comparator for phase-comparing said external input signal with said output signal delayed by said delay means, a digital code generating circuit receiving a comparison result from said comparator for generating a digital code composed of a plurality of bits, and a D/A converter receiving said digital code for generating a control signal to said controllable current source, wherein said D/A converter outputs a first control signal corresponding to a first digital code outputted from said digital code generating circuit, and when said first digital code changes to a second digital code, said D/A converter maintains said first control signal for a predetermined period of time, and then, outputs a second control signal corresponding to said second digital code after said predetermined period of time has elapsed.