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A low-noise small-area three-stage operational amplifier is presented for arrayed sensor interface systems. The designed amplifier employs a novel small-area phase compensation scheme that allows a relatively high transconductance in the first stage, resulting in relatively low input-referred noise. The proposed amplifier implemented in a standard 180-nm CMOS process occupies an active area of only...
This paper presents a low-noise small-area three-stage operational amplifier using split active-feedback compensation (SAFC) which is suitable for biomedical arrayed sensors. The proposed SAFC amplifier only requires a small capacitance for phase compensation, while it can achieve a low input-referred noise by increasing the first-stage transconductance without sacrificing the phase margin. The proposed...
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