Power efficient linear transmitters using sigma-delta modulation with switching amplifiers

Linear High-Efficiency Microwave Power Amplifiers Using Bandpass Delta-Sigma Modulators

A novel amplifier configuration is described, in which a bandpass delta-sigma modulator is used to produce a two-level (digital) signal representing an analog radio frequency (RF) input. Subsequently, a switching-mode amplifier and bandpass filter are used to amplify the signal and remove unwanted spectral components. This configuration has the potential of achieving high efficiency (typical of...

Delta-Sigma Digital-RF Modulation for High Data Rate Transmitters

A low power, wideband wireless transmitter utilizing ∆Σ direct digital modulation of an RF carrier is presented. The transmitter architecture replaces high dynamic range analog circuits with high speed digital circuits and a passive LC bandpass filter, saving power and area compared to conventional IQ modulators for wideband systems. A prototype transmitter IC built in 0.13 μm CMOS demonstrates...

Analysis & Design of Non-Linear Amplifiers for Efficient Microwave Transmitters

Class-E Power Amplifiers for Pulsed Transmitters

Nowadays the main driving parameters for the radio transmitter research are: energy efficiency, frequency re-configurability and integration. Pulsed transmitter architectures have attracted large interest in the recent years due to their potential to meet these demands. In pulsed transmitters, a highly efficient switch mode power amplifier (SMPA) is used in conjunction with a pulse modulator to...

Fpga Signal Processing Using Sigma-delta Modulation

While Σ∆M techniques [l, 2] are applied widely in analog conversion sub-systems, both analog-to-digital (ADC) and digital-to-analog (DAC) converters. these methods have enjoyed much less exposure in the broader application domain, where flexible and configurable solutions, traditionally supplied via a software DSP (soft-DSP), are required. And this limited level of exposure is easy to understan...