Dual mode amplifier network having an isolator in a digital path

Details Dual mode amplifier network having an isolator in a digital path Dual mode amplifier network having an isolator in a digital path

1996-12-16

1997-09-30

Chin, Wellington

Pulse or digital communications

Apparatus convertible to analog

375311, 455 93, 455 95, 332103, 332117, 332144, 379 58, H04L 2734

Patent

active

056732872

ABSTRACT:
The dual mode amplifier network of the present invention enables a radiotelephone to operate efficiently in both the U.S. Digital Cellular mode and the FM analog cellular mode. Multiple, switched branches (110 and 120) permit one branch (110) with an isolator (103) to be used in the in the U.S. Digital Cellular mode while the other branch (120) is switched out. In the analog mode, the transmit filter branch (120) is used while the isolator branch (110) is switched out.

REFERENCES:
patent: 5060294 (1991-10-01), Schwent
patent: 5175871 (1992-12-01), Kunkel
patent: 5251331 (1993-10-01), Schwent et al.
patent: 5276914 (1994-01-01), Ishizuka et al.
patent: 5333176 (1994-07-01), Barke et al.
patent: 5428664 (1995-06-01), Kobayashi

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