Quasi Rail-to-Rail Very Low-Voltage OPAMP With a Single pMOS Input Differential Pair
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In this brief, a quasi-rail-to-rail low-voltage operational amplifier (VDD-VSS-VDSATP-VDSATN) is introduced. A common-mode adapter that uses the common-mode voltage present at the common-source node of the available differential pair to accommodate the large common-mode input signal is proposed. The common-mode adapter operates properly at 300 kHz while driving a load capacitor of 15 pF and employs only 95 μ W of static power. The amplifier was fabricated in a standard AMI 0.5- μ m CMOS process ( Vtn= 0.7 V and Vtp= -0.9 V) and achieves an IM3 of — 48 dB at 300 kHz for a two-tone input signal of 0.8 Vpk-pk•A 1-V total supply voltage was used. © 2006, IEEE. All rights reserved.
author list (cited authors)
Baez-Villegas, D., & Silva-Martinez, J.