US 2025/0141412 A1 · METHODS AND APPARATUS TO MODULATE SIGNALS USING MULTI-CLASS MODULATION CIRCUITRY

Abstract

An example apparatus includes: class D amplifier circuitry having a first input, a second input, a third input, and an output, the first input of the class D amplifier circuitry coupled to the output of the class D amplifier circuitry; and class AB amplifier circuitry having a first input, a second input, a third input, and an output, the first input of the class AB amplifier circuitry coupled to the first input of the class D amplifier circuitry and the output of the class D amplifier circuitry, the second and third inputs of the class AB amplifier circuitry coupled to the second and third inputs of the class D amplifier circuitry, and the output of the class AB amplifier circuitry.

Claims20

Dependent claims

An apparatus comprising:

class D amplifier circuitry having a first input, a second input, a third input, and an output, the first input of the class D amplifier circuitry coupled to the output of the class D amplifier circuitry;
and
class AB amplifier circuitry having a first input, a second input, a third input, and an output, the first input of the class AB amplifier circuitry coupled to the first input of the class D amplifier circuitry and the output of the class D amplifier circuitry, the second and third inputs of the class AB amplifier circuitry coupled to the second and third inputs of the class D amplifier circuitry, and the output of the class AB amplifier circuitry.

An apparatus comprising:

first amplifier circuitry having a first input, a second input, and an output;
and
second amplifier circuitry including:
modulator circuitry having a first input, a second input, a first output, and a second output, the first input of the modulator circuitry coupled to the first input of the first amplifier circuitry and the output of the first amplifier circuitry, the second input of the modulator circuitry coupled to the second input of the first amplifier circuitry;
combination circuitry having a first input, a second input, and an output, the first input of the combination circuitry coupled to the first output of the modulator circuitry, the second input of the combination circuitry coupled to the second output of the modulator circuitry;
feedforward circuitry having a first input, a second input, and an output, the first input of the feedforward circuitry coupled to the output of the combination circuitry, the second input of the feedforward circuitry coupled to the output of the first amplifier circuitry;
comparison circuitry having an input and an output, the input of the comparison circuitry coupled to the output of the feedforward circuitry;
and
output stage circuitry having an input and an output, the input of the output stage circuitry coupled to the output of the comparison circuitry, the output of the output stage circuitry coupled to the first input of first amplifier and the first input of the modulator circuitry.

6 more elements

An apparatus comprising:

first amplifier circuitry having a first input, a second input, and an output;
and
second amplifier circuitry including:
third amplifier circuitry having a first input, a second input, and an output, the first input of the third amplifier circuitry coupled to the first input of the first amplifier circuitry and the output of the first amplifier circuitry, the second input of the third amplifier circuitry coupled to the second input of the first amplifier circuitry;
and
output stage circuitry having an input and an output, the input of the output stage circuitry coupled to the output of the third amplifier circuitry, the output of the output stage circuitry coupled to the second input of the first amplifier circuitry.

3 more elements

Dependencies are inferred from the claim text.

Methods and apparatus to modulate signals using multi-class modulation circuitry

Life of this patent

Methods and apparatus to modulate signals using multi-class modulation circuitry

Life of this patent

Abstract

Claims20