Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-07-02
1977-12-27
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307205, 307214, 307264, 307270, 307DIG4, H03K 508, H03K 1908, H03K 1940
Patent
active
040656780
ABSTRACT:
A clamped push-pull driver circuit suitable for driving high capacitive loads includes a bootstrap MOS inverter circuit driving an MOS push-pull driver circuit. A regulator circuit including a plurality of diode-connected MOSFETs is coupled between the output of the MOS bootstrap inverter and a ground conductor. A MOSFET (the feedback device) having its gate electrode coupled to the output of the MOS push-pull circuit is connected in series with the diode-connected MOSFETs. Rapid rise time and short delay are achieved at the output of the clamped push-pull driver circuit, since the regulator circuit does not begin to conduct current (i.e., does not start the clamping action) until the output voltage of the push-pull driver circuit has exceeded two thresholds. Thus a large drive capability is provided to initiate the rising action of the output signal and clamping only begins to occur after the output is already rising towards a higher virtual final level than that which clamping will allow. This delayed clamping action is controlled by the feedback MOSFET which is positioned between two of the diode-connected MOSFETs so that the feedback MOSFET is not turned on until the desired voltage is achieved at the output of the MOS push-pull driver circuit. The output of the MOS push-pull driver will continue to rise until it reaches a level which is one threshold below that set by the plurality of diode-connected MOSFETs. The final voltage, at the end of the rise time, at the output of the MOS push-pull driver circuit tracks with the MOS threshold voltage.
REFERENCES:
patent: 3631267 (1971-12-01), Heimbigner
patent: 3903431 (1975-09-01), Heeren
patent: 3912948 (1975-10-01), Bapat
patent: 3970875 (1976-07-01), Leehan
patent: 3975649 (1976-08-01), Kawagoe et al.
patent: 3989955 (1976-11-01), Suzuki
Gardner, "FET Off-Chip Driver Clamping;" IBM Tech. Discl. Bull.; vol. 16, No. 1, pp. 275-276, 6/1973.
Leach, Jr. George S.
Meyer Charles Shelley
Reese Edmund Arthur
Anagnos Larry N.
Barbee Joe E.
Heyman John S.
Motorola Inc.
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