A voltage scaling 0.25–1.8 V delta-sigma modulator with inverter-opamp self-configuring amplifier

Data converters using continuous time sigma delta modulators with VCO-based integrator and quantizer for ultra low power applications

“…This thesis focuses on the use of VCO-based architectures for data conversion in [3,[50][51][52][53][54]. In [3], the authors discuss a continuous time ΣΔ modulator with passive integrators (Figure 2.1).…”

“…In [51][52][53][54], the authors propose higher order discrete time ΣΔ modulators operating at very low voltage Figure 2 Advantages and limitations of these designs will be discussed.…”