Telecommunications end station with electrically controlled term

Details Telecommunications end station with electrically controlled term Telecommunications end station with electrically controlled term

1993-07-16

1995-12-05

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379398, 379400, 379399, H04M 158

Patent

active

054736854

ABSTRACT:
The terminating impedance can be set electrically to eliminate selection and installation of discrete components in order to meet network manager specifications. A control device such as an EEPROM is easily adjusted (programmed) to control circuits presenting a predetermined specified impedance to the communications line. The impedance is preferably formed by a switched capacitor filter in which ratios of capacitance rather than absolute values are easily obtained during manufacture of an IC. The DC termination value may be set separately from the AC impedance.

REFERENCES:
patent: 4757530 (1988-07-01), Arnon
patent: 4791668 (1988-12-01), Pringle
patent: 4807283 (1989-02-01), Pyhalammi
patent: 4887293 (1989-12-01), Molnar
patent: 4951312 (1990-08-01), Tanikawa et al.
patent: 4961219 (1990-10-01), Patel
patent: 5187742 (1993-02-01), Moran, III et al.
patent: 5249225 (1993-09-01), Williams
"A Software Programmable CMOS Telephone Circuit", by F. Dielacher et al, IEEE Journal of Solid-State Circuits Jul. 26, 1991, No. 7, New York, pp. 1015-1026.
Philips Data Handbook "ICs for Telecom Subscriber Sets, Cordless Telephones, Mobile/Cellular Radio Pagers CA 3089 to PCD 4413."
Philips Data Handbook "ICs for Telecom Subscriber Sets Cordless Telephones, Mobiel/Cellular Radio Pagers PCD 4413A to 74HC/HCT7046A."

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