US 2016/0079860 A1 · DIRECT CONVERSION OUTPUT DRIVER

Abstract

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.

Claims17

Dependent claims

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 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.

1 more element

A switching circuit for a differential output driver for a capacitive load, comprising:

a first switch coupled between a first output node and a supply voltage;
a second switch coupled between a second output node and the supply voltage, the capacitive load being coupled between the first output node and the second output node;
a third switch coupled between the first output node and a first switching node;
a fourth switch coupled between the first switching node and ground;
a fifth switch coupled between the second output node and a second switching node;
a sixth switch coupled between the second switching node and ground;
an inductor coupled between the first switching node and the second switching node;
a first control circuit for generating a first control signal, the first control signal having two states including a first state that enables coupling the first output node to the supply voltage and a second state that enables coupling the second output node to the supply voltage;
and
a second control circuit for generating a second control signal, 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.

7 more elements

A method for generating a differential output voltage for a capacitive load, comprising:

operating a switching circuit in a plurality of control modes, the switching circuit comprising a first half bridge circuit having a first output node and a first switching node and a second half bridge circuit having a second output node and a second switching node, with the capacitive load coupled between the first output node and the second output node, and an inductor coupled between the first switching node and the second switching node,
wherein a first control mode couples the first output node to a supply voltage and the first switching node to ground, a second control mode couples the first output node to the supply voltage and the second switching node to ground, a third control mode couples the second output node to the supply voltage and the first switching node to ground, and a fourth control mode couples the second output node to the supply voltage and the second switching node to ground.

Dependencies are inferred from the claim text.

Direct conversion output driver

Life of this patent

Direct conversion output driver

Life of this patent

Abstract

Claims17