Clamped push-pull driver circuit with output feedback
US4065678A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1976 |
| Grant date | Dec 27, 1977 |
| Priority date | — |
| Expiry date | Jul 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018507
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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 vo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.