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US 12,489,469 B2Granted
High efficiency non-pulse width modulation communications system and method
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJack Yuen Dea
Life of this patent
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Abstract
The system and method of the present invention provide power efficient, high fidelity non-PWM communications of audio signals for reception by a modulating AM receiver at various useful frequency bands, or loud speaker transmission using sound waves.
Claims29
A high fidelity non-pulse width modulation communications system for audio signal transmission, comprising:
- a radio frequency (RF) source for generating a carrier signal;
- a first switching amplifier configured to receive the carrier signal and generate an amplified carrier signal, the first switching amplifier further comprising:
- an inductor with a first end and a second end, wherein the second end is connected to the output audio modulated RF signal;
- a P-type enhancement mode, metal oxide field effect transistor (MOSFET) having gate in communication with the carrier signal received from the RF source, a source connected to Vdd and a drain connected to the first end of the inductor;
- and
- an N-type enhancement mode, MOSFET having gate in communication with the carrier signal, a drain connected to the first end of the inductor and a source connected to −Vdd;
- a phase-shifter configured to receive the carrier signal and an input audio signal, the phase-shifter further configured to phase-shift the carrier signal by the audio signal;
- a second switching amplifier configured to amplify the audio phase-shifted carrier signal received from the phase-shifter;
- and
- a RF low pass filter configured to pass a combination of the amplified carrier signal and the audio phase-shifted carrier signal as an output audio modulated RF signal.
7 more elements
A method for transmitting a high fidelity non-pulse width audio modulated radio frequency (RF) signal, the method comprising:
- providing a high fidelity non-pulse width modulation communications system for audio signal transmission configured to receive an input audio signal and output the high fidelity non-pulse width modulated audio signal, the system comprising:
- a RF source for generating a carrier signal;
- a first switching amplifier configured to receive the carrier signal and generate an amplified carrier signal, the first switching amplifier further comprising:
- an inductor with a first end and a second end, wherein the second end is connected to the output audio modulated RF signal;
- a P-type enhancement mode, metal oxide field effect transistor (MOSFET) having gate in communication with the carrier signal received from the RF source, a source connected to Vdd and a drain connected to the first end of the inductor;
- and
- an N-type enhancement mode, MOSFET having gate in communication with the carrier signal, a drain connected to the first end of the inductor and a source connected to −Vdd;
- a phase-shifter configured to receive the carrier signal and an input audio signal, the phase-shifter further configured to phase-shift the carrier signal by the audio signal, outputting an audio phase-shifted carrier signal;
- a second switching amplifier configured to amplify the audio phase-shifted carrier signal;
- a RF low pass filter configured to pass a combination of the amplified carrier signal and the audio phase-shifted carrier signal as an output audio modulated RF signal;
- and
- an antenna configured for transmitting the output audio modulated RF signal;
- amplifying the carrier signal to obtain an amplified carrier signal;
- phase-shifting the carrier signal to obtain a phase-shifted carrier signal;
- modulating the phase-shifted carrier signal with the input audio signal to obtain an input audio signal modulated phase-shifted carrier signal;
- amplifying the input audio signal modulated phase-shifted carrier signal to obtain an amplified input audio signal modulated phase-shifted carrier signal;
- combining the amplified carrier signal with the amplified input audio signal modulated phase-shifted carrier signal to obtain a net interference current that is an output audio modulated RF signal;
- and
- transmitting the output audio modulated RF signal.
16 more elements
A high fidelity non-pulse width modulation communications system for audio signal transmission, comprising:
- a radio frequency (RF) source for generating a carrier signal;
- a first switching amplifier configured to receive the carrier signal and generate an amplified carrier signal, the first switching amplifier further comprising:
- a first inductor with its first end connected to Vdd;
- a capacitor with its first end connected to a second end of the first inductor;
- a second inductor with its first end connected to a second end of the capacitor and its second end connected to the output audio modulated RF signal;
- and
- an N-type enhancement mode, metal oxide field effect transistor (MOSFET) having gate in communication with the carrier signal, a drain connected to the second end of the first inductor and the first end of the capacitor and source connected to GND;
- a phase-shifter configured to receive the carrier signal and an input audio signal, the phase-shifter further configured to phase-shift the carrier signal by the audio signal;
- a second switching amplifier configured to amplify the audio phase-shifted carrier signal received from the phase-shifter;
- and
- a RF low pass filter configured to pass a combination of the amplified carrier signal and the audio phase-shifted carrier signal as an output audio modulated RF signal.
8 more elements
A high fidelity non-pulse width modulation communications system for audio signal transmission, comprising:
- a radio frequency (RF) source for generating a carrier signal;
- a first switching amplifier configured to receive the carrier signal and generate an amplified carrier signal;
- a phase-shifter configured to receive the carrier signal and an input audio signal, the phase-shifter further configured to phase-shift the carrier signal by the audio signal;
- a second switching amplifier configured to amplify the audio phase-shifted carrier signal received from the phase-shifter, the second switching amplifier further comprising:
- a P-type enhancement mode, metal oxide field effect transistor (MOSFET) having gate in communication with the audio phase-shifted carrier signal received from the phase-shifter, a drain connected to Vdd and source connected to GND;
- an N-type enhancement mode, MOSFET having gate in communication with the audio phase-shifted carrier signal received from the phase-shifter, a drain connected to GND and a source connected to −Vdd;
- a first inductor connected between the P-type MOSFET source and the output audio modulated RF signal;
- and
- a second inductor connected between the N-type MOSFET source and the output audio modulated RF signal;
- and
- a RF low pass filter configured to pass a combination of the amplified carrier signal and the audio phase-shifted carrier signal as an output audio modulated RF signal.
8 more elements
A high fidelity non-pulse width modulation communications system for audio signal transmission, comprising:
- a radio frequency (RF) source for generating a carrier signal;
- a first switching amplifier configured to receive the carrier signal and generate an amplified carrier signal;
- a phase-shifter configured to receive the carrier signal and an input audio signal, the phase-shifter further configured to phase-shift the carrier signal by the audio signal;
- a second switching amplifier configured to amplify the audio phase-shifted carrier signal received from the phase-shifter, the second switching amplifier further comprising:
- a first inductor with its first end connected to Vdd;
- a capacitor with its first end connected to a second end of the first inductor;
- a second inductor with its first end connected to a second end of the capacitor and its second end connected to the output audio modulated RF signal;
- and
- an N-type enhancement mode, metal oxide field effect transistor (MOSFET) having gate in communication with the audio phase-shifted carrier signal received from the phase-shifter, a drain connected to the second end of the first inductor and the first end of the capacitor and source connected to GND;
- and
- a RF low pass filter configured to pass a combination of the amplified carrier signal and the audio phase-shifted carrier signal as an output audio modulated RF signal.
8 more elements
Dependencies are inferred from the claim text.