Direct conversion output driver

摘要

A circuit and method for providing a fully integrated differential boost converter and amplifier. A first half bridge circuit has a first output node and a first switching node. A second half bridge circuit has a second output node and a second switching node. A capacitive load is coupled between the first output node and the second output node. An inductor is coupled between the first switching node and the second switching node. Control modes are provided to couple the first output node to a supply voltage and the first switching node to ground; to couple the first output node to the supply voltage and the second switching node to ground; to couple the second output node to the supply voltage and the first switching node to ground; and to couple the second output node to the supply voltage and the second switching node to ground.

主权项

1. A switching circuit for a differential output driver for a capacitive load, comprising:
a first half bridge circuit having a first output node and a first switching node; a second half bridge circuit having a second output node and a second switching node, the capacitive load being coupled between the first output node and the second output node; an inductor coupled between the first switching node and the second switching node; a control circuit coupled to the first half bridge circuit and to the second half bridge circuit, the control circuit configured to operate the switching circuit with a first control signal and a second control signal, the first control signal having two states including a first state that enables coupling the first output to a supply voltage and a second state that enables coupling the second output to the supply voltage, the second control signal having two states including a first state that enables coupling the first switching node to ground and enables coupling the second switching node to the second output, and a second state that enables coupling the second switching node to ground and enables coupling the first switching node to the first output.