[1997]A dynamic analysis of the Dickson charge pump circuit

Dynamics of the Dickson charge pump circuit have
been analyzed. The analytical results enable the estimation of the
rise time of the output voltage and that of the power consumption
during boosting. By using this analysis, the optimum number
of stages to minimize the rise time has been estimated as 1.4
Nmin, where Nmin is the minimum value of the number of stages
necessary for a given parameter set of a supply voltage, threshold
voltages of transfer diodes, and a boosted voltage. Moreover,
the self-load capacitance of the charge pump, which should be
charged up at the same time as the output load capacitance
of the charge pump, has been estimated as about one-third of
the total charge pump capacitance. As a result, the equivalent
circuit of the charge pump has been modified. The analytical
results have been in good agreement with the simulation results
by the iteration method, typically within 10% for the rise time
and within 2% for the power consumption. In case of a charge
pump with MOS transfer transistors, the analytical result of the
rise time has agreed with the SPICE simulation within 10%.
IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 32, NO. 8, AUGUST 1997 1231




A Dynamic Analysis of the
Dickson Charge Pump Circuit
Toru Tanzawa and Tomoharu Tanaka



Abstract― Dynamics of the Dickson charge pump circuit have in steady state is derived as a function of the output voltage.
been analyzed. The analytical results enable the estimation of the Next, the total charge consumed by the charge pump during
rise time of the output voltage and that of the power consumption boosting is obtained by two different methods; by using the
during boosting. By using this analysi