250-mV Supply Subthreshold CMOS Voltage Reference Using a Low-Voltage Comparator and a Charge-Pump Circuit

摘要

This brief proposes a subthreshold CMOS voltage reference circuit, which reduces the minimum supply voltage by replacing the analog amplifier in the conventional CMOS voltage reference circuit with a low-voltage comparator, a charge-pump circuit, and a digital control circuit. The subthreshold CMOS voltage reference circuit was fabricated using a 0.11- CMOS process. Its core area was 0.013 and it consumed 5.35 at and . Its minimum supply voltage was 242 mV. Ten sample chips generated 193–207-mV reference voltage with 0.4–3.2-mV/100-mV line sensitivity at – and – temperature coefficient at – .