Enhancing general performance of folded cascode amplifier by recycling current
نویسندگان
چکیده
Introduction: A major building block of analogue integrated circuits is the operational transconductance amplifier (OTA), which for many applications is the most power consuming block. Recently, the folded cascode (FC) amplifier has gained preference over the telescopic owing to the low voltage nature of present and future CMOS technologies, despite the higher power budget. In addition, the PMOS driven FC has become the optimal choice for its lower flicker noise, higher non-dominant poles and low input common=mode level, which makes input switching using a single NMOS transistor possible [1, 2]. However, the choice comes at the expense of increased input capacitance and power. In this Letter, a modification to the FC aims to resolve its power limitation by recycling the bias current of idle transistors. This is done at virtually no expense in performance.
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