| US 7,349,465 B2 | ||
| Line interface system | ||
| Alfred Mangino, Lambertville, N.J. (US); Ojas M. Choksi, North Brunswick, N.J. (US); and Faramarz Sabouri, Lawrenceville, N.J. (US) | ||
| Assigned to Analog Devices, Inc., Norwood, Mass. (US) | ||
| Filed on Feb. 26, 2004, as Appl. No. 10/787,652. | ||
| Claims priority of provisional application 60/524073, filed on Nov. 21, 2003. | ||
| Prior Publication US 2005/0113034 A1, May 26, 2005 | ||
| Int. Cl. H04B 1/38 (2006.01) | ||
| U.S. Cl. 375—220 [375/222; 375/297; 375/318] | 14 Claims |
| 1. A transceiver system for use in a telecommunication system, said transceiver system comprising:
a transmission circuit including a differential transmitter input coupled via a transmitter input stage to a differential
input of a transmission amplifier, said transmitter input stage including a trimmable resistor, one end of which is coupled
to a positive transmit input, and the other end of which is coupled to a negative transmit input, said trimmable resistor
providing a desired corner frequency to be set by adjusting the trimmable resistor;
a receiver circuit including a differential receiver output coupled to a differential input of a receiver amplifier, dual
negative feedback paths, a first differential input path having a first pair of capacitors, and a second differential input
path having a second pair of capacitors, said first and second differential input paths providing first and second differential
input signals from first and second filters respectively to the receiver amplifier; and
a transmission line interface circuit coupled to a differential output of said transmission amplifier and to a differential
input of said receiver amplifier.
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