Patent ID: 7515895
Filing Date: 2009-04-07
Classification: H01F,H01L,H03B,H03D,H03F,H03G,H03H,H03J,H03L

Abstract:
1. An apparatus for switching at least one switchable capacitor in a filter, the apparatus comprising: a regular periodic signal generator that controls timing of switching of each switchable capacitor of a filter, the regular periodic signal generator being operatively coupled to a first input of a filter through a counter; a control bus operatively coupled between each switchable capacitor and the counter, the counter controlling each switchable capacitor through the control bus; and a first phase detector operatively coupled between the filter and the counter, wherein, in a first cycle, more capacitance is added as the counter advances, and wherein a reset signal to the counter resets the counter for a subsequent cycle.