Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-10-02
2007-10-02
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S112000, C327S201000, C363S059000
Reexamination Certificate
active
10287352
ABSTRACT:
A voltage supply circuit which suppresses generation of current spikes in the power source current in operation, reduce noise, simplify the circuit configuration, and decrease the cost. Clock signal CLK at a prescribed frequency is supplied to charge pump driver (10); current sources IS1,IS2, . . . IS6work at timing set with clock signal CLK to output driving currents; and, corresponding to the driving currents, capacitors C1, C2. . . are alternately charged or discharged; the charge stored in the capacitor of a preceding stage is sequentially sent to the later capacitor stage, and a boosted voltage higher than power source voltage Vcc is obtained at output terminal T2. In the charge pump type booster, since capacitors are driven with current sources, it is possible to reduce spike noise in the boosting operation, and influence on other analog circuits can be suppressed.
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Graf, Rudolf F., Modern Dictionary of Electronics, Seventh Edition, Newnes, 1999, p. 166 (“current source”).
Fukui Eizo
Miyamitsu Fumiaki
Brady III W. James
Englund Terry L.
Kempler William B
Wells Kenneth B.
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