Design of RF tuner for digital television broadcasting system (DVB-T) This project uses TSMC\'s 0.35μm SiGe process to design a RF tuner for digital television broadcasting system. Its feature is that it is first upconverted to a first intermediate frequency above 1 GHz and then downconverted to a second intermediate frequency of 36 MHz. Compared with the single-conversion architecture, the advantage is that the image channel falls outside the receiving band and therefore does not require a high amount of image rejection capability. The chip test results show that the gain of the overall tuner circuit is reduced due to the loss of the balanced to single-ended converter used in the circuit, the parasitic effects of the pounding line and the layout and routing on the test board. Further consideration of this non-ideal effect was added to the original design for simulation, and the results were found to be consistent with the measured data. The RF modulator chip has a gain of about 27dB, a noise figure of 10dB and an output third-order crossover point of 9dBm under continuous wave (CW) testing. The sensitivity under QPSK modulation signal testing is about -88dBm; the sensitivity under 16QAM modulation signal testing is about -72dBm, and the dynamic range is greater than 80dB, which has good RF characteristics. Keywords: digital TV broadcasting system, RF tuner, double frequency conversion architecture.
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