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A nanowire-CMOS heterogeneously integrated circuit is demonstrated. The circuit consists of a voltage divider using series-connected resistors and a delta-sigma modulator (DSM); a single InAs nanowire is used as one of the resistors. Nanowire deposition is carried out by field-assisted self-assembly (FASA) process based on dielectrophoresis. The DSM uses a class-C inverter in its loop filter instead...
An energy-efficient ΔΣ modulator has been investigated by using dynamic-common-source integrators. Instead of the virtual short commonly used in conventional opamp-based integrators, the novel integrator used the fact that when a MOSFET turns off from its on-state, the voltage difference between the gate and source approaches to the threshold voltage, which is virtually constant after the charge redistribution...
Energy efficiency of multi-bit eS modulators has been investigated in terms of a normalized power dissipation, which is commonly referred to as the figure-of-merit (FOM). The multi-bit modulators are designed by adding a multi-level comparator and feedback path to a conventional inverter-based modulator. The FOM is estimated by transistor-level circuit simulation assuming a 0.18-µm standard CMOS technology...
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