A Low-Noise Delta-Sigma Phase Modulator for Polar Transmitters

<table>Polar transmitters with <svg height="11.425" id="M7" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 21.1875 11.425" width="21.1875" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.363)"><path d="M600 0h-557v24l268 633l28 8l261 -641v-24zM497 50l-194 489l-196 -489h390z" id="x394"></path></g><g transform="matrix(.017,-0,0,-.017,10.959,11.363)"><path d="M570 168l-39 -168h-498v23l262 301l-248 304v22h471q4 -71 11 -146l-29 -4q-17 65 -37 88q-12 15 -36 20.5t-79 5.5h-181l211 -256l-243 -287h280q51 0 77 20.5t49 83.5z" id="x3A3"></path></g>
</svg> PLL based phase modulation: (a) digital precompensation and (b) two-point modulation techniques.</table>

The Scientific World Journal

A Low-Noise Delta-Sigma Phase Modulator for Polar Transmitters

Figure 1