Intermediate frequency selecting device for use in dual band cel

Details Intermediate frequency selecting device for use in dual band cel Intermediate frequency selecting device for use in dual band cel

1997-11-25

2000-06-13

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455553, 455 76, 4551801, 455313, H04Q 720, H04B 138

Patent

active

060759968

ABSTRACT:
A dual band cellular telephone includes an antenna, a power amplifier, RF transmission and reception chains, first and second local oscillators, and IF transmission and reception chains. In order to select an intermediate frequency, processing circuitry within the telephone determines center frequencies of transmission radio frequency sweep ranges of first and second bands, calculates a difference between the center frequencies of the first and second transmission bands, and multiplies the calculated difference value by a scaling coefficient to calculate a center local oscillating frequency associated with one of the RF transmission bands. It then subtracts the transmission center frequency of one of the RF transmission bands from the local oscillator center frequency to determine the transmission intermediate frequency. Preferably, the cellular telephone has a single local oscillator for transmit and a single local oscillator for receive. The IF selection method enables the same IF frequency separation between transmit and receive when operating at any frequency in the dual band system.

REFERENCES:
patent: 4330687 (1982-05-01), Foulkes et al.
patent: 4823373 (1989-04-01), Takahashi et al.
patent: 4972455 (1990-11-01), Phillips et al.
patent: 5448762 (1995-09-01), Ward
patent: 5564076 (1996-10-01), Auvray
patent: 5722053 (1998-02-01), Kornfeld et al.
patent: 5884149 (1999-03-01), Jaakola
patent: 5896562 (1999-04-01), Heinonen

Affiliated with

Also associated with

Rating

Intermediate frequency selecting device for use in dual band cel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intermediate frequency selecting device for use in dual band cel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intermediate frequency selecting device for use in dual band cel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2077643