Abstract
A novel internal compensation technique named dual frequency compensation is proposed to improve the stability and the transient response of the on-chip output capacitor three stage low-drop-out linear voltage regulator (LDO). It exploits a combination of amplification and differentiation to sufficiently separate the dominant pole from the first non-dominant pole so that the latter is located after the unity gain frequency regardless of the load current value. The proposed LDO regulator is analyzed, designed, and simulated in standard 0.18 µm low voltage CMOS technology. The presented LDO regulator delivers a stable voltage of 1.2 V for an input supply voltage range of 1.35-1.85 V with a maximum line deviation of 4.68mV/V and can supply up to 150mA of the load current. The maximum transient variation of the output voltage is 54.5 mV when the load current pulses from 150mA to 0mA during a fall time of 1µs. The proposed LDO regulator has a low figure of merit compared with recent LDO regulators.
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