| 摘要 |
PURPOSE: An apparatus for compensating a voltage offset in a CDMA communication system transmitter is provided to compensate a voltage offset after measuring the voltage of two channels and feeding it back. CONSTITUTION: A transmitter in a CDMA communication system is comprised of a codec part(100), a modem part(200), a BBA(BaseBand Analog) part(300), an RF(Radio Frequency) part(400), and a voltage measurement part(500). The codec part(100) converts a signal(A), inputted through a microphone, into a digital signal(B). The modem part(200) compensates the voltage offset of the digital signal(B) and converts it into a digital signal(C) suitable for CDMA communication. The BBA part(300) converts the digital signal(C) supplied from the modem part(200) into an analog signal(D). The RF part(400) loads the analog signal(D) onto a frequency carrier signal and transmits it through an antenna. The voltage measurement part(500) measures the voltage of each channel of the BBA part(300) according to a control signal(K) from the modem part(200), converts it into a digital signal(J), and feeds it back to the modem part(200).
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