CMOS class-AB current mirrors for precision current-modeanalog-signal-processing elements

摘要

CMOS class-AB current mirrors for high-precision current-modenanalog-signal-processing elements are described. The class-ABnconfiguration allows us to reduce the offset error caused by devicenmismatch, the nonlinearity distortion, and power consumption. The offsetnerror due to the device mismatch is greatly reduced by the reduction ofnthe bias current. The class-AB current-mirror has less sensitivity tonthe mismatch since the bias current relative to the signal current cannbe reduced. The excellent precision is confirmed by Monte Carlonsimulation and SPICE based on 1 Μm CMOS LSI parameters