| 摘要 |
A circuit for generating a voltage waveform at an output node. The circuit includes a first voltage rail configured to be held at a first voltage, wherein the first voltage rail is connected to the output node via a first voltage rail switch; a second voltage rail configured to be held at a second voltage that is different from the first voltage, wherein the second voltage rail is connected to the output node via a second voltage rail switch; at least one anchor node connected to the output node via an inductor and an anchor node switch; and a control unit configured to switch the circuit between: a first voltage outputting state in which the first voltage rail switch is closed and the second voltage rail switch is open such that the output node is clamped to the first voltage; and a second voltage outputting producing state in which the second voltage rail switch is closed and the first voltage rail switch is open such that the output node is clamped to the second voltage. The control unit is configured to switch the circuit from the first voltage outputting state to the second voltage outputting state by: opening the first voltage rail switch and closing an anchor node switch that connects the output node via an inductor to an anchor node held at a first anchor voltage so that, if a load capacitance is connected to the output node, a resonant circuit is established between the inductor and the load capacitance causing the voltage at the output node to swing towards the second voltage, wherein the first anchor voltage is configured to provide energy that assists the voltage at the output node in swinging towards the second voltage; and then opening the anchor node switch and closing the second voltage rail switch. The control unit is further configured to switch the circuit from the second voltage outputting state to the first voltage outputting state by: opening the second voltage rail switch and closing an anchor node switch that connects the output node via an inductor to an anchor node held at a second anchor voltage so that, if a load capacitance is connected to the output node, a resonant circuit is established between the inductor and the load capacitance causing the voltage at the output node to swing towards the first voltage, wherein the second anchor voltage is configured to provide energy that assists the voltage at the output node in swinging towards the first voltage; and then opening the anchor node switch and closing the first voltage rail switch. |
