Class-D amplifier
AssigneeNXP B.V.
InventorRoland Basten
Life of this patent
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Abstract
The invention describes a power amplifier comprising a first transistor (MHS) having a first control terminal and a first main current path coupled between a first supply terminal (Vdd) and a first node (VH), a second transistor (MLS) having a second control terminal and a second main current path coupled between a second supply terminal (Vss) and a second node (VL), a first controlled resistor (MHC) coupled between the first node and an output node (Vout) of the amplifier, a second controlled resistor (MLC) coupled between the second node and the output node (Vout) of the amplifier, the first transistor being controlled by a first driver comprising a level shifting circuit, and the second transistor being controlled by a second driver including a time delaying circuit.
Claims18
A power amplifier comprising:
- a first transistor having a first control terminal and a first main current path coupled between a first supply terminal and a first node,
- a second transistor having a second control terminal and a second main current path coupled between a second supply terminal and a second node,
- a first controlled resistor coupled between the first node and an output node (Vout) of the amplifier,
- a second controlled resistor coupled between the second node and the output node (Vout) of the amplifier,
- the first transistor being controlled by a first driver comprising a level shifting circuit,
- the second transistor being controlled by a second driver including a time delaying circuit;
- and
- further comprising a first capacitor coupled between the first controlled terminal and the output node, the amplifier comprising a second capacitor coupled between the second controlled terminal and the output node.
A power amplifier comprising:
- a first transistor having a first control terminal and a first main current path coupled between a first supply terminal and a first node,
- a second transistor having a second control terminal and a second main current path coupled between a second supply terminal and a second node,
- a first controlled resistor coupled between the first node and an output node (Vout) of the amplifier,
- a second controlled resistor coupled between the second node and the output node (Vout) of the amplifier,
- the first transistor being controlled by a first driver comprising a level shifting circuit,
- the second transistor being controlled by a second driver including a time delaying circuit;
- and
- further comprising a first capacitor coupled between the first controlled terminal and the second node, the amplifier comprising a second capacitor coupled between the second controlled terminal and the first node.
A power amplifier comprising:
- a first transistor having a first control terminal and a first main current path coupled between a first supply terminal and a first node,
- a second transistor having a second control terminal and a second main current path coupled between a second supply terminal and a second node,
- a first controlled resistor coupled between the first node and an output node (Vout) of the amplifier,
- a second controlled resistor coupled between the second node and the output node (Vout) of the amplifier,
- the first transistor being controlled by a first driver comprising a level shifting circuit, and
- the second transistor being controlled by a second driver including a time delaying circuit;
- wherein the first and the second driver comprises a respective first and second controlled current source coupled to the respective level shifting circuit and to the delaying circuit, the first controlled current source providing current to the second node and to the first node and the second controlled current source providing current to the to the first node.
Dependencies are inferred from the claim text.