Patent ID: 8502596
Filing Date: 2013-08-06
Classification: H03H,H04B

Abstract:
1. A circuit for filtering signals on at least one signal line, the circuit comprising at least one connection connected to the at least one signal line and an input connection configured to receive a control signal, the circuit being configured to output a plurality of signals at a plurality of frequencies, each of the signals being attenuated by an amount determined by the frequency of the signal, wherein the circuit is configured to attenuate signals output at a first frequency by an amount which is low relative to the attenuation of signals output at frequencies other than the first frequency, and to attenuate signals output at a second frequency by an amount which is high relative to the attenuation of signals output at frequencies other than the second frequency, and wherein, responsive to a change in the control signal, the circuit is configured to change the first and second frequencies while maintaining a fixed ratio between the first and second frequencies.