US 2026/0149360 A1 · RIPPLE CANCELLATION IN SWITCHED-MODE VOLTAGE CONVERTERS

Abstract

A voltage converter circuit includes a switched-mode voltage converter and a ripple cancellation circuit. The switched-mode voltage converter includes a first switching device having a first terminal coupled to a first power supply terminal, and a second switching device having a first terminal coupled to a second terminal of the first switching device, and a second terminal coupled to a second power supply terminal. The ripple cancellation circuit includes an op amp having a non-inverting input coupled to a load terminal; a first resistor coupled between the output of the op amp and an inverting input of the op amp; a second resistor coupled between the second terminal of the first switching device and the inverting input of the op amp; a first capacitor coupled in parallel with the first resistor; and a third resistor coupled between the output of the op amp and the load terminal.

Claims20

Dependent claims

A circuit, comprising:

a first switching device, having a first terminal coupled to a first power supply terminal, a second terminal, and a control terminal;
a second switching device, having a first terminal coupled to the second terminal of the first switching device, and a second terminal coupled to a second power supply terminal;
a first op amp, having an inverting input, a non-inverting input coupled to a load terminal, and an output;
a first resistor, having a first terminal coupled to the output of the first op amp, and a second terminal coupled to the inverting input of the first op amp;
a second resistor, having a first terminal coupled to the second terminal of the first switching device and a second terminal coupled to the inverting input of the first op amp;
a first capacitor, having a first terminal coupled to the output of the first op amp, and a second terminal coupled to the inverting input of the first op amp;
and
a third resistor, having a first terminal coupled to output of the first op amp, and a second terminal coupled to the load terminal.

5 more elements

A voltage converter circuit, comprising:

a switched-mode voltage converter, configured to switch a current at an output terminal responsive to a voltage at a load terminal;
and
a ripple cancellation circuit, having inputs coupled to the output terminal and the load terminal, and an output coupled to the output terminal, the ripple cancellation circuit configured to output a cancellation current corresponding to an integration of a difference between the voltage at the load terminal and a voltage at the output terminal.

A circuit, comprising:

a linear power amplifier, having an output coupled to a load terminal of the circuit;
a voltage converter, having an output coupled to the load terminal, and having a feedback input;
and
a control loop circuit, having an input coupled to the load terminal, and an output coupled to the feedback input of the voltage converter;
wherein the voltage converter includes:
a first op amp, having an inverting input, a non-inverting input coupled to the load terminal, and an output;
a first resistor, having a first terminal coupled to the output of the first op amp, and a second terminal coupled to the inverting input of the op amp;
a second resistor, having a first terminal coupled to the voltage converter output, and a second terminal coupled to the inverting input of the first op amp;
a first capacitor, having a first terminal coupled to the output of the first op amp, and a second terminal coupled to the inverting input of the first op amp;
and
a third resistor, having a first terminal coupled to the output of the first op amp, and a second terminal coupled to the load terminal.

8 more elements

Dependencies are inferred from the claim text.

Ripple cancellation in switched-mode voltage converters

Life of this patent

Ripple cancellation in switched-mode voltage converters

Life of this patent

Abstract

Claims20