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Safe start-up sequence of integrated charge pumps using dedicated control circuit

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3 Author(s)

The circuit presented eliminates forward biasing of p-n junctions during the start-up phase of an IC containing charge pumps. The result is achieved by a precharge mechanism that freezes the voltage level of the wells in the IC during the start-up phase. The design has been implemented in a TFT display driver from Philips Semiconductors; measurements show no spurious currents in the start-up phase.

Published in:

Electronics Letters  (Volume:41 ,  Issue: 25 )