Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Reexamination Certificate
2006-02-21
2006-02-21
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
C327S540000, C327S170000
Reexamination Certificate
active
07002381
ABSTRACT:
A switched capacitor controller accurately controls the rise time of an on-chip generated high voltage. An on-chip charge pump is used to generate a high voltage (VPP) from an external power supply voltage (VCC). This high voltage signal (VPP) can be used to program Flash memory cells. A capacitor of a switched capacitor circuit is selectively switched between ground and a given node voltage. This generates a stair-stepped ramp function. The period of the steps is controlled according to a clock signal. This clock signal may be altered to produce the desired period. The voltage increases of the steps is regulated by a reference voltage multiplied by a ratio between two capacitor values. Thereby, the rise-time of the ramp function is accurately controlled as a function of the frequency of the clock signal and the ratio of the two capacitor values.
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Advanced Micro Devices , Inc.
Lam Tuan T.
Nguyen Hiep
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