Transmitter circuits

Details Transmitter circuits Transmitter circuits

2006-06-13

2006-06-13

Ramakrishnaiah, Melur (Department: 2643)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S127100, C333S136000, C333S129000, C332S162000

Reexamination Certificate

active

07062236

ABSTRACT:
A polar loop transmitter includes separate phase and envelope paths providing a linearising scheme for an efficient non-linear power amplifier. Loop filters are included in each of the phase and envelope paths to enable the path characteristics to be matched to one another. A polar loop transmitter and other types of envelope elimination and restoration transmitters control the output envelope of the power amplifier by connecting the output of the envelope detector, or in an envelope feedback transmitter, the envelope error signal, to the bias control input of the power amplifier. The transmitter can further include compensation means for compensating for non-linearities in the envelope control means and a loss of feedback control detector to ensure that the feedback signal remains within acceptable limits.

REFERENCES:
patent: 5023937 (1991-06-01), Opas
patent: 5105168 (1992-04-01), DaSilva
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5847602 (1998-12-01), Su
patent: 1 017 162 (1999-07-01), None
patent: 403131105 (1991-06-01), None
patent: 02000156796 (2000-06-01), None
patent: 00/31881 (2000-06-01), None
European Search Report.

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