Patent ID: 8953670
Filing Date: 2015-02-10
Classification: H03F,H04B,H04L

Abstract:
1. A transmitter, comprising: a first digital up-converter for converting data to an intermediate frequency (IF) signal; a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train; a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train; a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train, and wherein the PWM is a multi-level PWM, further comprising: a splitter for duplicating the IF signal; two multi-level quantizers, each quantizer quantizes the IF signal based on the comparison of the IF signal with a set of thresholds to produce two waveforms; and a combiner for combining the two waveforms to produce the IF pulse train, and the two multi-level quantizers includes a first quantizer and a second quantizer, and the set of thresholds includes a first set of thresholds and a second set of threshold, and wherein values of the threshold in the first set are opposite to values of the threshold in the second set.