Transmitter apparatus
A transmitter and equipment technology, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of phase imbalance, power amplifier noise affecting measurement, etc., and achieve the effect of accurate measurement and the smallest possible error
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[0017] Fig. 1 shows a schematic structure of a transmitter device 1 according to a preferred embodiment of the present invention. The transmitter device 1 may be used in a wireless communication system such as Global System for Mobile Communications (GSM) or Enhanced Data Rates for GSM Evolution (EDGE). The transmitter device 1 and the method described below are applicable to the transmitter 1 having the digital modulator 2 that performs digital in-phase / quadrature modulation.
[0018] The transmitter device 1 comprises a modulator 2 , a delay unit 3 , a first digital-to-analog converter 4 and a second digital-to-analog converter 5 . The modulator 2 is adapted to receive a digital signal via line 6 and convert the received signal into a digital in-phase signal and a digital quadrature signal. The digital in-phase signal is output from modulator 4 to converter 4 via line 7 . The digital quadrature signal is output to the converter 5 through the line 8 . The converter 4 is ad...
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