A Low Quiescent Biased Regulator With High PSR Dedicated to Micropower Sensor Circuits

Abstract

A new micropower high power-supply-rejection (PSR) regulator, on the basis of op-amp-less architectural design, is presented in this paper. The proposed regulator is based on the embodiment of the Brokaw bandgap regulator circuit in an additional feedback control loop so as to achieve high efficiency in terms of referenced PSR bandwidth per current. The measured PSR performance without any filtering capacitor for a 50-k nominal resistive load at 1 kHz and 1 MHz are obtained as 76 and 43 dB, respectively. The regulator, making use of native driving devices to improve the headroom, supports the supply range from 2 to 3.3 V. The output voltage is close to 1.8 V, having an untrimmed temperature coefficient of 117 ppm C from 40 C to 125 C while drawing the quiescent current of only 5.65 A. The regulator occupies an area of 0.047 mm 2 using current source model 1.8 V/3.3 V CMOS 0.18 m triple-well process technology. The circuit is verified using the realistic BSIM3 models for simulation. Finally, the performance comparison with respect to the measured results of reported works, using technology normalized figure of merit, has validated that the proposed circuit technique offers good PSR results while having the advantages of low quiescent power, small size, and full integration without any off-chip capacitor. The proposed regulator is particularly suitable for micropower sensor circuits.Index Terms-Bandgap voltage regulator, low power, power supply rejection, voltage regulator.

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“…In this design, is about 10% of at no load. The simplified MFL loop gain function is given by (17) with and the same as (9) and (12), and …”

“…However, the low-and fixedstrategy in the previous designs limits the achievable loop bandwidth. As a result, the power supply rejection (PSR) and the output impedance can hardly attain wide bandwidth (the lowest frequency at which PSR and are better than specified worst-case values [17]). …”

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“…This influence not only includes DC voltage levels (line regulation), but also any AC distortion. The independence of the output voltage from the input is called power supply rejection (PSR) (Ong and Chan, 2010). In literature also often the term PSRR (power supply rejection ratio) (Baker, 2010;Holberg, 2010) is found, which is more true for amplifier as there a ratio between the signal amplification and the power distortion damping exists, while in regulators only the power distortion damping is of interest.…”

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“…is limited by the nonlinear temperature effect existing in V GS (T). In addition, due to the simple current source structure, the line sensitivity or PSR performance is relatively poor which constrains its capability for applications requiring a good immunity against the fluctuation of supply voltage [90], [91].…”