The Wideband High-Linearity Mixers for Cable Television Tuner Application

The wideband high-linearity mixers for a double conversion cable TV tuner is presented. The up-conversion mixer converts the input signal from 100 MHz to 1000 MHz to the intermediate frequency (IF) of 1 GHz above. And the down-conversion mixer converts the frequency back. The degeneration resistors are used to improve the linearity. The tuner is implemented in a 0.35 mum SiGe technology. Input power at 1dB compression point can reach +14.23 dBm. The lowest noise figure is 17.5 dB. The two mixers consume 103 mW under a supply voltage of 5 V.

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