Patent ID: 7504879

Claim:
A circuit comprising: a front end module for converting a differential input voltage signal into a differential output current and supplying said output current at a differential output; and a filter module coupled to said differential output of said front end module for receiving said output current, converting said output current into a differential voltage and filtering said differential voltage to obtain a filtered differential output voltage signal, wherein said filter module further comprises: a plurality of resistor devices, a first end of each resistor device directly coupled in series to a respective line of said differential output of said front end module, a plurality of emitter followers, a base of each emitter follower directly coupled to a second end of each of said resistor devices, a plurality of capacitor devices, a first end of each capacitor device directly coupled to a respective line of said differential output of said front end module and a second end of each capacitor device directly coupled to a respective emitter of said emitter followers, a further capacitor device coupled between each base of the emitter followers.