Patent ID: 9722543
Date: 2017-08-01
CPC Classifications: H03F

Claim:
1. A method of generating a power supply voltage tracking a reference signal, comprising: generating a plurality of filtered reference signals by filtering the reference signal such that the filtered reference signals each have different bandwidths, wherein filtering the reference signal comprises: generating a first voltage in dependence on the plurality of filtered reference signals, wherein the plurality of filtered reference signals comprises the first and the second filtered reference signals; generating n-2 further voltages in dependence on the n-2 further filtered reference signals, wherein a total number of generated voltages is n; combining the n-2 further voltages with the generated first voltage by combining each of the n-2 further voltages in cascaded stages, wherein for an i generating a second voltage in dependence on the reference signal; and combining the first and second voltages to provide the power supply voltage.