Digital middle frequency multi-frequency multi-mode radio frequency module
A multi-mode radio frequency, digital intermediate frequency technology, applied in the direction of electrical components, transmission systems, etc.
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[0010] Accompanying drawing discloses the principle block diagram of the present invention, the present invention will be further described below in conjunction with accompanying drawing, by figure 1 visible:
[0011] Transmission channel; the direct conversion modulator is a dual-band quadrature modulator, and the quadrature IQ signal of W-CDMA, cdma2000 or TD-SCDMA / LAS-CDMA given by the baseband interface is sent to the direct modulator 1, and the direct modulation In the device 1, the frequency synthesizer 12 provides a local oscillator of 1920MHz-1980MHz for the W-CDMA mode, provides a local oscillator of 824MHz-849MHz for the cdma2000 mode, and provides a local oscillator of 2010MHz-2025MHz for the TD-SCDMA / LAS-CDMA mode. The radio frequency signals of the four modes output by the direct modulator 1 are sent into the wideband variable gain amplifier 2, and the amplified signals are sent to three power amplifiers separately through the multiplexing switch 3, which are resp...
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