Methods and circuits for harmonic suppression
AssigneeDialog Semiconductor GmbH
InventorAo Ba
Life of this patent
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Abstract
The present document discloses circuits and methods for providing an output voltage at an output port. In one of the embodiments, a circuit has a power amplifier having an output. In particular, the circuit may have a first transformer including a first coil and a second coil. Moreover, the circuit may have a first capacitor connected in parallel to the first coil and a second capacitor connected in parallel to the second coil. More particularly, the circuit may be adapted to have a first end of the first coil connected to the output of the power amplifier, and a second end of the first coil connected to the output port of the circuit.
Claims30
A circuit for providing an output voltage at an output port,
- the circuit comprising:
- a power amplifier having an output;
- a first transformer including a first coil and a second coil;
- a first capacitor connected in parallel to the first coil;
- and
- a second capacitor connected in parallel to the second coil;
- wherein a first end of the first coil is connected to the output of the power amplifier, and wherein a second end of the first coil is connected to the output port of the circuit, wherein the first coil, second coil, first capacitor and second capacitor are configured such that a signal provided at the output port of the circuit corresponds to a notch filtered version of a signal provided at the output of the power amplifier,
- and wherein said notch filtering is adapted to suppress two harmonics of the signal provided at the output of the power amplifier.
A circuit for providing an output voltage at an output port, the circuit comprising:
- a power amplifier comprising a transformer, wherein the transformer comprises a first and a second transformer coil;
- a first coil and a second coil;
- and
- a capacitor connected by one end to a first end of the first coil;
- wherein:
- the first end of the first coil is connected to a second end of the second coil, a first end of the second coil is the output port of the circuit, a first end of the first transformer coil is connected to a second end of the first coil, and
- wherein the first transformer coil and the first coil are configured to be inductively coupled by a first coupling factor, and wherein the first transformer coil and the second coil are configured to be inductively coupled by a second coupling factor.
A method for providing an output voltage at an output port, the method comprising:
- providing a power amplifier having an output;
- providing a first transformer including a first coil and a second coil;
- providing a first capacitor;
- connecting the first capacitor in parallel to the first coil;
- providing a second capacitor;
- connecting the second capacitor in parallel to the second coil;
- connecting a first end of the first coil to the output of the power amplifier;
- connecting a second end of the first coil to the output port, such as to generate a signal at the output port corresponding to a filtered version of a signal provided at the output of the power amplifier;
- configuring the first coil, second first capacitor and second capacitor such that said signal generated at the output port corresponds to a notch filtered version of the signal provided at the output of the power amplifier;
- and
- notch filtering said signal provided at the output of the power amplifier such as to suppress two harmonics.
A method for providing an output voltage at an output port, the method comprising:
- providing a power amplifier comprising a transformer, wherein the transformer comprises a first and a second transformer coil;
- providing a first coil and a second coil;
- connecting a first end of the first coil to a second end of the second coil;
- connecting a first end of the first transformer coil to a second end of the first coil;
- connecting a first end of the second coil to the output port;
- providing a capacitor;
- connecting said capacitor by one end to the first end of the first coil;
- configuring the first transformer coil and the first coil to be inductively coupled by a first coupling factor, and configuring the first transformer coil and the second coil to be inductively coupled by a second coupling factor, such that a signal provided at the output port corresponds to a filtered version of a signal provided at the first end of the first transformer coil.
Dependencies are inferred from the claim text.