Telecommunications – Transmitter and receiver at same station – Convertible
Patent
1994-09-19
1995-08-01
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Convertible
455116, 455126, 330129, 330284, 375345, H04G 140, H03G 312, H03G 320
Patent
active
054386837
ABSTRACT:
An automatic level control circuit for cellular telephone transmitters which is compatible with both existing analog cellular service and expected next generation digital TDMA service. The circuit automatically and dynamically changes modes to maintain communication when a mobile subscriber moves from one type of service to another. In a first mode of operation, which is compatible with existing analog cellular service, the circuit provides a closed loop negative feedback circuit which produces a control signal for continuously controlling the output power level of the transmitter amplifier. In a second mode of operation, which is compatible with proposed digital TDMA service, the circuit operates to alternately close the negative feedback loop during the periods when the transmitter is permitted to transmit (assigned TDMA frames) and open the loop during other periods when the transmitter is turned off. When the loop is opened, the invention temporarily stores the magnitude of the control signal. This stored value is subsequently used to quickly restore the amplifier to its assigned power level during successive frames when the loop is again closed for burst transmission.
REFERENCES:
patent: 4371842 (1983-02-01), Lee
patent: 4468607 (1984-08-01), Tanaka et al.
patent: 4760347 (1988-07-01), Li et al.
patent: 4952886 (1990-08-01), Braathen et al.
patent: 5003270 (1991-03-01), Braathen et al.
patent: 5054116 (1991-10-01), Davidson
patent: 5060294 (1991-10-01), Schwent et al.
patent: 5128629 (1992-07-01), Trinh
patent: 5179353 (1993-01-01), Miyaka
patent: 5193223 (1993-03-01), Walczak et al.
patent: 5214393 (1993-05-01), Aihara
Anvari Kiomars
Durtler Willem G.
Tsien Chih C.
Charouel Lisa
Eisenzopf Reinhard J.
NovAtel Communications Ltd.
LandOfFree
Automatic level control circuit for dual mode analog/digital 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 Automatic level control circuit for dual mode analog/digital cel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic level control circuit for dual mode analog/digital cel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-739742