Amplifier Modulation Method and Apparatus
AssigneeInfineon Technologies AG
InventorsThomas Potscher, Johan Sjostrom, Andreas Wiesbauer, Peter Singerl
Life of this patent
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Abstract
A signal is modulated by generating a pulse-width modulation signal and applying the pulse-width modulation signal to an input of a switched-mode amplifier. An output of the amplifier is coupled to a filter operable to impart either differential mode oscillations or common mode oscillations at the amplifier output based on the duty cycle of the pulse-width modulation signal. The duty cycle of the pulse-width modulation signal is varied to impart amplitude modulations at the amplifier output.
Claims25
A method of modulating a signal, comprising:
- generating a pulse-width modulation signal;
- applying the pulse-width modulation signal to an input of a switched-mode amplifier;
- coupling an output of the amplifier to a filter operable to impart either differential mode oscillations or common mode oscillations at the amplifier output based on the duty cycle of the pulse-width modulation signal;
- and
- varying the duty cycle of the pulse-width modulation signal to impart amplitude modulations at the amplifier output.
A radio frequency transmitter, comprising:
- a signal generator operable to output a pulse width modulation signal;
- a switched-mode amplifier having an input configured to receive the pulse-width modulation signal;
- a circuit coupled to an output of the amplifier and operable to impart either differential mode oscillations or common mode oscillations at the amplifier output based on the duty cycle of the pulse-width modulation signal;
- and
- wherein the signal generator is operable to vary the duty cycle of the pulse-width modulation signal to impart amplitude modulations to the amplifier output.
A method of modulating a signal, comprising:
- applying a pulse-width modulation signal to an input of a switched-mode amplifier having an output corresponding to the phase and duty cycle of the pulse-width modulation signal;
- coupling the amplifier output to a circuit operable to configure the amplifier output in either a differential operating mode or a common operating mode based on the duty cycle of the pulse-width modulation signal;
- and
- switching the amplifier output between the differential and common operating modes based on variations in the duty cycle of the pulse-width modulation signal to impart amplitude modulations at the amplifier output.
A radio frequency modulator, comprising:
- a switched-mode amplifier having an input operable to receive a pulse-width modulation signal and an output;
- a circuit coupled to the amplifier output and operable to configure the amplifier output in either a differential operating mode or a common operating mode based on the duty cycle of the pulse-width modulation signal;
- and
- wherein the amplifier output switches between the differential and common operating modes based on variations in the duty cycle of the pulse-width modulation signal to impart amplitude modulations at the amplifier output.
A radio frequency modulator, comprising:
- a switched-mode amplifier having an input configured to receive a pulse-width modulation signal and an output corresponding to the phase and duty cycle of the pulse-width modulation signal;
- means for configuring the amplifier output in either a differential operating mode or a common operating mode based on the duty cycle of the pulse-width modulation signal;
- and
- wherein the amplifier output switches between the differential and common operating modes based on variations in the duty cycle of the pulse-width modulation signal to impart amplitude modulations at the amplifier output.
Dependencies are inferred from the claim text.