Low-output-impedance 0.6 μm CMOS sub-bandgap reference

A 0.6 mum CMOS sub-bandgap reference circuit, the output voltage of which is, unlike reported in the literature, concurrently low voltage and low output impedance, is presented. Experimental measurements verify that the proposed circuit, which produces a first-order temperature-compensated reference voltage of 890 my sources up to 5 mA of load current and rejects noise by a factor of 30.8-8.1 dB at 500 kHz- 4 MHz, neither of which feature is achieved by state-of-the-art sub-bandgap circuits.