论文信息 - Highly linear integrate-and-fire modulators with soft reset for low-power high-speed imagers

Highly linear integrate-and-fire modulators with soft reset for low-power high-speed imagers

This paper presents a complete family of integrate- and-fire modulator (IAF) topologies to improve in-pixel signal linearity in digital imagers. Three types of soft-reset schemes are analyzed for capacitive trans-impedance amplifiers (CTIAs). The proposed Type III has the main advantages of avoiding any low-impedance voltage source or extra capacitor, of including correlated double sampling (CDS) for the cancellation of CTIA low-frequency noise, and of minimum current biasing requirements. Comparative electrical simulations are also presented to demonstrate the linearity improvements of soft-reset schemes and the increase of IAF modulation robustness under low-power circuit operation.

Francisco Serra-Graells | Josep Maria Margarit | Lluís Terés | Roger Figueras | Michele Dei

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