Patent ID: 8238866

Claim:
A variable bandwidth filter, comprising: a first mixer for translating the frequency of an input signal by a first predetermined frequency value to provide a first output signal; a first filter for defining one edge of said variable bandwidth, the first filter being applied to the first output signal; a second mixer for translating the frequency of the filtered first output signal by a second predetermined frequency value to provide a second output signal; a second filter for defining another edge of said variable bandwidth, the second filter being applied to the second output signal; further mixer arrangement for translating the frequency of the filtered second output signal by a further predetermined frequency value, wherein said further mixer arrangement provides a counterpart frequency translation corresponding to each of said first and second predetermined frequency values; and a local oscillator arrangement for providing a first local oscillator frequency to said first mixer and to said further mixer arrangement, and a second local oscillator frequency to said second mixer and to said further mixer arrangement.