An all-digital universal RF transmitter [CMOS RF modulator and PA]

Rf Power Amplifiers for Mobile Communications

“…One could say that the lowpass filter is upconverted to a bandpass filter at the output. Now, the RF power amplifier is turned on and off by the pulses delivered by the Class D amplifier, which is controlled by a PWM, SOPA or ∆Σ modulator [Stas05,Wagh04,Raab02,Pies01]. This can be considered as single bit digital polar modulation.…”

An FPGA Based All-Digital Transmitter with Radio Frequency Output for Software Defined Radio

“…RFPWM algorithm and simulation results were presented in Midya et al [11]. Wagh et al [16] present a digital RF transmitter based on digital PWM, however the duty ratios were computed offline and then fed to the PWM generator for testing. This paper presents the implementation of a complete all-digital transmitter with RF output.…”

“…However, only simulation results or non real-time test results have been presented in literature [8,10,16]. In these works, the digital RF signals were computed offline and stored in pattern generator for the purpose of measurement.…”