Patent ID: 9628051
Date: 2017-04-18
CPC Classifications: H01J,H02M,H03K,Y02B

Claim:
1. A circuit for generating a voltage waveform at an output node, the circuit including: a single voltage rail connected to the output node via a voltage rail switch; an anchor node connected to the output node via an inductor and a bidirectional switch, wherein the bidirectional switch includes two or more transistors connected in series; and a control unit configured to change the voltage at the output node by controlling the voltage rail switch and the bidirectional switch so that, if a load capacitance is connected to the output node, a resonant circuit is established between the inductor and the load capacitance; wherein the control unit of the circuit is configured to control the circuit to operate according to a control method including: opening the bidirectional switch and closing the voltage rail switch so that the output node is clamped at the voltage of the voltage rail; causing the voltage at the output node to swing towards a floating voltage by opening the voltage rail switch and closing the bidirectional switch so that a resonant circuit is established between the inductor and the load capacitance; opening the bidirectional switch without closing the voltage rail switch so that the output node is held at the floating voltage without being clamped at the voltage of any voltage rail; causing the voltage at the output node to swing towards the voltage of the voltage rail by closing the bidirectional switch so that a resonant circuit is established between the inductor and the load capacitance.