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US 11,581,892 B2Granted
Method of driving a capacitive load, corresponding circuit and device
AssigneeSTMicroelectronics S.r.l.
InventorMarco Zamprogno
Life of this patent
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Abstract
A method includes pre-charging a parasitic capacitance of a control node that is coupled to a control terminal of first and second transistors that have respective current paths that form a switched current path coupled between a load node and a storage node. Pre-charging the parasitic capacitance includes: making conductive a first auxiliary transistor that has a current path coupled between the storage node and the control node, or making conductive a second auxiliary transistor that has a current path coupled between the load node and the control node. The method further includes, after pre-charging the parasitic capacitance, making the switched current path conductive to couple the load node to the storage node.
Claims20
A method comprising:
- pre-charging a parasitic capacitance of a control node that is coupled to a control terminal of a first transistor of an electronic switch and to a control terminal of a second transistor of the electronic switch, the first transistor having a current path coupled to a current path of the second transistor, wherein the first and second transistors have respective junction diodes, wherein the current path of the first transistor and the current path of the second transistor form a switched current path coupled between a load node that is coupled to a load capacitance and a storage node that is coupled to a set of energy storage capacitances, wherein pre-charging the parasitic capacitance comprises:
- making conductive a first auxiliary transistor that has a current path coupled between the storage node and the control node, or
- making conductive a second auxiliary transistor that has a current path coupled between the load node and the control node;
- and
- after pre-charging the parasitic capacitance, making the switched current path conductive to couple the load node to the storage node.
2 more elements
A circuit comprising:
- a load node configured to be coupled to a load capacitance;
- an energy storage node configured to be coupled to a set of energy storage capacitances;
- a switched current path configured to be made selectively conductive to couple the load node to the energy storage node;
- a first transistor and a second transistor, the first transistor and the second transistor comprising respective junction diodes, wherein the first transistor has a first current path coupled between a first common node and the energy storage node, wherein the second transistor has a second current path coupled between the first common node and the load node, the switched current path comprising the first current path and the second current path, wherein the first transistor and the second transistor have respective control terminals mutually coupled at a second common node having a parasitic capacitance;
- a first auxiliary transistor having a current path coupled between the energy storage node and the second common node;
- and
- a second auxiliary transistor having a current path coupled between the load node and the second common node, wherein the circuit is configured to:
- pre-charge the parasitic capacitance by making conductive the first auxiliary transistor or the second auxiliary transistor, and
- after pre-charging the parasitic capacitance, making the switched current path conductive to couple the load node to the storage node.
6 more elements
A device comprising:
- a capacitive load;
- a storage capacitor;
- and
- a circuit comprising:
- a load node coupled to the load capacitance,
- an energy storage node coupled to the storage capacitance,
- a switched current path configured to be made selectively conductive to couple the load node to the energy storage node,
- a first transistor and a second transistor, the first transistor and the second transistor comprising respective junction diodes, wherein the first transistor has a first current path coupled between a first common node and the energy storage node, wherein the second transistor has a second current path coupled between the first common node and the load node, the switched current path comprising the first current path and the second current path, and wherein the first transistor and the second transistor have respective control terminals mutually coupled at a second common node having a parasitic capacitance,
- a first auxiliary transistor having a current path coupled between the energy storage node and the second common node, and
- a second auxiliary transistor having a current path coupled between the load node and the second common node, wherein the circuit is configured to:
- pre-charge the parasitic capacitance by making conductive the first auxiliary transistor or the second auxiliary transistor, and
- after pre-charging the parasitic capacitance, making the switched current path conductive to couple the load node to the storage node.
9 more elements
Dependencies are inferred from the claim text.