Abstract
After spectrum spreading and pulse shaping, the digital outputs from the baseband modulator need to be converted into an analog waveform, and upconverted to the RF pass-band for transmission. Specifically, the 4 parallel outputs of the modulator integrated circuit must be multiplexed back into a 256 MHz serial stream, passed through a state-of-the-art 10 bit ECL D/A converter, and then modulated to a carrier frequency by a 1024 MHz carrier. In this chapter, several architectures to perform the required analog signal processing are described, especially with regards to achieving broadband, single-sideband frequency upconversion. Single sideband is necessary since the first stage of up-conversion has been performed in the digital domain — the output of the modulator is centered at 64 MHz, not DC.
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© 1998 Springer Science+Business Media New York
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Yee, D. (1998). Broadband RF Transmission and Modulation. In: Low-Power CMOS Wireless Communications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5457-8_5
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DOI: https://doi.org/10.1007/978-1-4615-5457-8_5
Publisher Name: Springer, Boston, MA
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