Energy consumption is always a key feature in devices powered by electric accumulators.
The power amplifier is the most energy-demanding module in mobile devices, portable appliances,
static transceivers, and even nodes used in underwater acoustic networks. These devices incorporate
a modulator, typically a pulse-width modulation (PWM) and a class-D power amplifier, for higher
efficiency. We propose a technique to integrate the modulator of a transmitter and PW-modulator of a
class-D amplifier to improve the overall efficiency of the system. This integrated set operates as an
up-converter, phase modulator (PM), and binary phase-shift keying (BPSK) modulator under certain
conditions. The theoretical concept is verified using Matlab and a model is designed and simulated in
Simulink. For validation purposes, an electronic circuit is built and tested using Multisim. The results
obtained by simulations and circuit implementation show that the proposed integrated system is an
energy-efficient and cost-effective solution compared to conventional techniques.