Transmitting-receiving device comprising a closed cartesian...

Details Transmitting-receiving device comprising a closed cartesian... Transmitting-receiving device comprising a closed cartesian...

2005-12-20

2005-12-20

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Transmitters

Antinoise or distortion

C330S254000, C332S103000

Reexamination Certificate

active

06977968

ABSTRACT:
The invention relates to a transmitting device (19) including a quadrature modulator (3) for carrying out the quadrature modulation of a complex input signal (I, Q) and including a power amplifier (9) connected in outgoing circuit to the quadrature modulator (3). A quadrature demodulator (19) for carrying out the quadrature demodulation of the output signal of the power amplifier (9) is provided for a feedback loop. A first differential amplifier (26) and a second differential amplifier (27) are connected in incoming circuit to the quadrature modulator (3). The input signal and the fed back quadrature modulated signal are supplied to the inputs of the differential amplifiers. When switching over from the transmit mode to a transmit-interruption mode, the output of the first and second differential amplifiers (26, 27) can be directly connected to the compensation input (−) of the first or second differential amplifier (26, 27) via a direct signal path (32, 33) while bypassing the quadrature modulator (3), the power amplifier (8) and the quadrature modulator (19).

REFERENCES:
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patent: WO 99/17439 (1999-04-01), None
patent: WO 00/25421 (2000-05-01), None

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