Signal interface circuit with selectable signal interface parame

Details Signal interface circuit with selectable signal interface parame Signal interface circuit with selectable signal interface parame

1994-12-09

1997-01-28

Zele, Krista M.

Telephonic communications

Line equalization or impedance matching

379399, 379402, H04M 176

Patent

active

055984673

ABSTRACT:
A signal interface circuit with selectable signal interface parameters for a telephone subscriber line includes an impedance circuit having a selectable impedance value, signal terminals having an associated, definable termination impedance, a transmitter circuit having a definable transmitter transfer function and a receiver circuit having a definable receiver transfer function. The signal terminals connect to an external signal line pair having an associated line impedance for conducting outgoing and incoming signals therefrom and thereto, respectively. The transmitter circuit receives the outgoing signal from the signal terminals and provides a transmit signal in accordance with its transmitter transfer function. The receiver circuit, which includes a differential transconductance amplifier, receives an input signal and the transmit signal and provides the incoming signal to the signal terminals in accordance with its receiver transfer function. The termination impedance, transmitter transfer function and receiver transfer function are all defined by the selectable impedance, with the termination impedance defined to match the line impedance.

REFERENCES:
patent: 4476350 (1984-10-01), Aull et al.
patent: 4588858 (1986-05-01), Watts et al.
patent: 4706244 (1987-11-01), Watson et al.
patent: 4918725 (1990-04-01), Takahashi
patent: 5422948 (1995-06-01), Nishimura
patent: 5459787 (1995-10-01), Tomasini et al.
patent: 5473685 (1995-12-01), Mulder
patent: 5528683 (1996-06-01), Tomasini et al.

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