Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-05-30
1999-05-18
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327390, 327589, 327333, 327535, 327537, 327546, 326 81, G05F3/02
Patent
active
059054026
ABSTRACT:
A voltage pump circuit for precharging/pumping a charge to/from a pumping capacitor separately employs a voltage generator for independently supplying a well-bias voltage to a PMOS transfer transistor which transfers a charge of a precharged capacitor to produce reference voltage. The voltage of the voltage generator is applied to a well of the PMOS transfer transistor to body bias the PMOS transfer transistor and, thus, ruggedize its threshold voltage transistor. Here, the well-bias voltage equals or exceeds the reference voltage while being approximately twice a power source voltage. The well-bias voltage generator includes a non-overlap control circuit for receiving a pulse signal as an input to generate two pulse signals having different points of changing into high and low states, a second pumping capacitor, first, second and third bootstrap capacitors, a precharge circuit for precharging the voltage on the second pumping capacitor and first and second bootstrap capacitors for a predetermined period, a first step control circuit for controlling a first-step transistor, a second step control circuit for controlling a second-step transistor and a pumping control circuit for controlling a third-step transistor, which are provided for precharging the voltage to the third bootstrap capacitor, and a transfer transistor having a gate connected to the reference voltage of the third bootstrap capacitor for transferring the well-bias voltage.
REFERENCES:
patent: 5521546 (1996-05-01), Kim
"Application of a High-Voltage Pumped Supply for Low-Power DRAM", by Foss et al., 1992 Symposium on VLSI Circuits Digest of Technical Papers, pp. 106-107.
"Silicon Processing for the VLSI ERA", by Stanley Wolf, Lattice Press 1990, pp. 296-311.
Jun Young-Hyun
Kim Tae-Hoon
Le Dinh
LG Semicon Co., Ltd
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