Positive and negative square wave generating circuit powered by single power supply

The invention discloses a single-power-supply positive and negative square wave generation circuit which comprises a coupling capacitor, a control circuit and an output circuit. A control signal Vcontrol is accessed to the control circuit through the coupling capacitor, and the control circuit is used for controlling the single power supply to generate positive and negative square waves and outputting the positive and negative square waves through the output circuit; the circuit design cost and complexity can be reduced, the reliability is improved, and the defect that positive and negative square waves can be generated only by providing positive and negative power supplies in the prior art is effectively overcome. 本发明公开了一种单电源供电正负方波产生电路，包括：耦合电容、控制电路和输出电路；控制信号Vcontrol通过耦合电容接入控制电路，控制电路用于控制单电源产生正负方波，并经输出电路输出；能够减少电路设计成本和复杂度，提高可靠性，从而有效克服现有技术需要提供正负电源才能产生正负电平方波的不足。