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GC4116,pdf(Multi-Standard Quad
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The GC4116 quad transmit chip contains four identical up-conversion channels. The up-convert channels accept real or complex signals, interpolate them by programmable amounts ranging from 32 to 5,792, and modulates them up to selected center frequencies. The modulated signals are then summed together and optionally summed with modulated signals from other GC4116 chips. Channels can be used in pairs to reduce the interpolation ratio down to 16 in order to process wider band input signals.
Each channel contains a user programmable input filter (PFIR) which can be used to shape the transmitted signal’s spectrum, or can be used as a Nyquist transmit filter for shaping digital data such as QPSK, GMSK or QAM symbols.
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