US 12,489,469 B2
High efficiency non-pulse width modulation communications system and method
Jack Yuen Dea, San Diego, CA (US)
Assigned to United States of America as represented by the Secretary of the Navy, Washington, DC (US)
Filed by United States of America as represented by the Secretary of the Navy, San Diego, CA (US)
Filed on Apr. 18, 2023, as Appl. No. 18/302,324.
Prior Publication US 2024/0356569 A1, Oct. 24, 2024
Int. Cl. H04B 1/00 (2006.01); H04B 1/10 (2006.01)
CPC H04B 1/0042 (2013.01) [H04B 1/10 (2013.01)] 29 Claims
OG exemplary drawing
 
1. 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.