A Compact Rail-to-Rail Class-AB CMOS Buffer With Slew-Rate Enhancement

作者：Sawigun Chutham^*; Demosthenous Andreas; Liu Xiao; Serdijn Wouter A

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2012, 59(8): 486-490.

DOI：10.1109/TCSII.2012.2204843

• Analog buffer
• class AB
• CMOS circuits
• high speed
• rail to rail
• slew-rate enhancement

Two prior-art transconductance amplifier-based rail-to-rail class-AB analog buffers are examined. Their analysis reveals that the output current drive capability for large input voltages is restricted. To mitigate this drawback, a relatively simple slew-rate enhancement scheme is proposed. The new scheme allows the buffer%26apos;s speed to be increased by over 200% with only a very small increase in static power consumption (1.25%) and silicon area (3%). The proposed and the two conventional buffers were fabricated in a 0.35-mu m CMOS technology for a power supply of 3 V. Measurements verify the superior slew-rate performance of the new buffer for rail-to-rail step responses.

• 出版日期2012-8