ADSL receiver high pass filter architecture

Details ADSL receiver high pass filter architecture ADSL receiver high pass filter architecture

2006-07-18

2006-07-18

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S093050, C379S414000

Reexamination Certificate

active

07079646

ABSTRACT:
An ADSL receiver HPF architecture300that reduces the number of Op Amps below that required for known ADSL receiver HPFs. The ADSL receiver HPF300is implemented as an active RC filter to provide a single fifth-order Elliptic filter instead of the more conventional pair of third-order Elliptic filters. Since the HPF Elliptic filter stage having the lowest Q factor is reduced as the order of an Elliptic filter transfer function is increased, a single fifth-order Elliptic filter suitable for use as an ADSL receiver HPF can be implemented using only one Op Amp in the second 2nd-order HPF stage308. A notch (imaginary zero) is provided by summing of output signals associated with active RC structure state variables. This structure minimizes the number of capacitors while preserving the capability to provide a high Q factor for the first 2nd-order HPF stage304.

REFERENCES:
patent: 6831975 (2004-12-01), Easwaran et al.
patent: 2004/0248542 (2004-12-01), Heuermann et al.

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