By Pieter A. J. Nuyts, Patrick Reynaert, Wim Dehaene
This ebook describes the layout of absolutely electronic multistandard transmitter front-ends which could without delay force a number of switching energy amplifiers, hence putting off all different analog elements. After reviewing diversified architectures, the authors specialize in polar architectures utilizing pulse width modulation (PWM), that are totally in response to unclocked hold up traces and different continuous-time electronic undefined. consequently, readers are enabled to shift accuracy matters from the voltage area to the time area, to coincide with submicron CMOS expertise scaling. The authors current diverse architectural techniques and evaluate them, according to their impact at the sign and spectrum caliber. subsequent, a high-level theoretical research of 2 diversified PWM-based architectures – baseband PWM and RF PWM – is made. at the circuit point, conventional electronic parts and layout suggestions are revisited from the viewpoint of continuous-time electronic circuits. very important layout standards are pointed out and assorted recommendations are offered, besides their benefits and drawbacks. eventually, chips designed in nanometer CMOS applied sciences are defined, in addition to size effects for validation.