Generation and synchronization of pulse-width modulated (PWM) waveforms for radio-frequency (RF) applications

Abstract

Described are concepts, systems, circuits and techniques directed toward methods and apparatus for generating one or more pulse width modulated (PWM) waveforms with the ability to dynamically control pulse width and phase with respect to a reference signal.

Description

Background technique [0001] As known in the art, impedance matching networks are commonly used to maximize power transfer within many radio frequency (RF) and microwave systems. For example, in an RF transmitter, an impedance matching network may be used to provide impedance matching from the output impedance of an RF power amplifier (PA) to the impedance of an RF load (eg, an antenna). This impedance matching increases the power transferred, reduces power loss, and reduces or eliminates the need for additional circuit components (eg, isolators, etc.). [0002] One type of impedance matching network is called a tunable impedance matching network (TMN), sometimes called an automatic antenna tuning element. A conventional TMN can be implemented as a single-element or lumped-element reactive network, where at least one of the reactive elements is a variable (e.g., tunable) element such that at a specific frequency Or the impedance can be modified over a frequency range. The re...

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Problems solved by technology

However, digital TMNs exhibit limited tuning resolution and thus limited accuracy with which impedance matching can be achieved

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