Clockless pulse shaping circuit for controlling a power amplified output

According to an exemplary embodiment, a circuit includes a power amplifier configured to generate an RF output signal. The circuit further includes a pulse shaping circuit coupled to the power amplifier, where the pulse shaping circuit is configured to receive a digital input signal and generate an analog output signal at a first node, and where the analog output signal controls the RF output signal. The analog output signal has a ramp-up portion having a first shape, where the first shape corresponds to a piece-wise-linear approximation of a sinusoid. The analog output signal also has a ramp-down portion having a second shape, where the second shape corresponds to the piece-wise-linear approximation of a sinusoid. The pulse shaping circuit does not require a clock reference to generate the analog output signal.