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A Dual Charge Pump for Quiescent Touch Sensor Power Supply

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4 Author(s)
Jong-Min Baek ; Coll. of Inf. & Commun. Eng., Sungkyunkwan Univ., Suwon, South Korea ; Dong-Jin Seo ; Jung-Hoon Chun ; Kee-Won Kwon

This brief presents a dual charge pump suitable for touch sensor power supply applications, where a calm standby voltage as well as quick recovery from disturbance is required. The proposed circuit adaptively controls the two parallel-connected charge pumps: a current driving Dickson's charge pump with a pumping capacitor of 95.4 pF and a low-ripple cross-couple charge pump with a capacitor of 10.6 pF. The heavy-duty Dickson's pump turns on for swift recovery from the drastic charge loss and turns off for reduced noise during the hold-and-sensing period. An instantaneous pumping stroke of the charge pump controller and a low dropout following the charge pumps further reduce supply noise. The proposed circuit is fabricated using a 0.18-μm CMOS process. Measurement results show a recharge time shorter than 1 μs and supply noise less than the detection limit. The area penalty is less than 1% compared to a single charge pump.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:59 ,  Issue: 11 )