ASK MODULATION CIRCUIT AND METHOD, AND WIRELESS CHARGING RECEIVER

An ASK modulation circuit includes a logic control circuit, a rectifier circuit, and a constant-current source circuit. The logic control circuit controls, within a dead time period, a discharging current or an injection current is transmitted through a first node and a second node, such that change rates of voltages at the first node and the second node increase or decrease respectively, that is, the change rates of the voltages at the first node and the second node change respectively. In this way, a current in the receive coil changes, and hence a current in a transmit coil changes, such that ASK modulation is achieved. In this way, ASK modulation is not affected while the off-chip capacitors, the on-chip switching transistors, and the chip pins are reduced or eliminated.