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State-of-the-art closed-loop switched-capacitor (SC) designs usually regulate the output voltage by pulse frequency modulation (PFM) with the disadvantage of large electromagnetic interference (EMI). It may cause the failure of the Internet of Everything (IoE) devices. This paper proposes the hybrid digital low drop-out (DLDO) SC converter with a constant switching pulse width modulation (PWM) control...
Different from conventional multiphase switched-capacitor (SC) DC-DC converters, the proposed unsymmetrical parallel switched-capacitor (UP-SC) regulator provides more controllable input variables to increase available conversion ratios for improved load regulation. Even under higher conversion ratio numbers, the UP-SC regulator uses the fast searching optimum ratio (FSOR) technique to search the...
The stacking MOSFET structure composed of low-voltage devices suffers from deteriorated transient response or large footprint area when capacitor-free or dominant pole compensation low dropout (LDO) regulator biases the driver. Due to self-stabilized feature, the proposed stacking MOSFET driving (SMD) technique effectively drives the power stage and greatly reduces noise interference from the noisy...
RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the...
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