A 270-mV ΔΣ Modulator Using Gain-Enhanced, Inverter-Based Amplifier
2013 (English)Manuscript (preprint) (Other academic)
An ultra-low-voltage low-power switched-capacitor ΔΣ modulator running at a supply voltage as low as 270 mV is presented for medical implant devices. To reduce the supply voltage and power consumption, an inverter-based amplifier is used in the integrator, whose DC-gain and gain-bandwidth (GBW) are boosted by a simple current-mirror output stage. The full feedforward loop topology offers low integrators internal swing, supporting ultra-low-voltage operation. The entire modulator operates at 270 mV supply only, while the switches are driven by charge pump clock doubler. Designed in 65 nm CMOS and clocked at 256 kHz, the simulation results show that the converter achieves 64.4 dB signal-to-noise-ratio (SNR) and 61 dB signal-to-noise-and-distortionratio (SNDR) in 1 kHz bandwidth while consuming 0.85 "W power.
Place, publisher, year, edition, pages
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-102896OAI: oai:DiVA.org:liu-102896DiVA: diva2:684086