Cartesian loop transmitter and method of adjusting an output...

Details Cartesian loop transmitter and method of adjusting an output... Cartesian loop transmitter and method of adjusting an output...

2008-03-04

2008-03-04

Nguyen, Lee (Department: 2618)

Telecommunications

Transmitter

With feedback of modulated output signal

C330S109000

Reexamination Certificate

active

10560752

ABSTRACT:
In accordance with the present invention there is those provided a Cartesian loop transmitter having an isolator eliminator circuitry comprising a set of low pass and band pass filters for each of an I- and Q-channels, root mean square detectors and a divider connected to a comparator are received by a microprocessor which controls attenuation setting. There is also provided a method of adjusting an output level of such transmitter. Said method comprises the step of measuring an on-channel signal level and a noise level and then calculating a ratio of said noise to said on-channel signal. If the ratio exceeds a defined threshold an attenuation of the input attenuators is increased.

REFERENCES:
patent: 5623226 (1997-04-01), Whitmarsh et al.
patent: 5675286 (1997-10-01), Baker et al.
patent: 5894496 (1999-04-01), Jones
patent: 5959499 (1999-09-01), Khan
patent: 2003/0031271 (2003-02-01), Bozeki
patent: 2007/0184789 (2007-08-01), Ben-Ayun et al.
patent: 1 235 344 (2002-08-01), None
patent: WO 01/63792 (2001-08-01), None

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