DESCRIPTION
Capable of receiving any channel from 50 to 800 MHz, designs employing the TLG1100 can be deployed for analog television reception nearly worldwide with only minimal software changes. A wideband, low-noise amplifier is used to receive the entire video signal band from the antenna, and provides a gain range in excess of 60 dB. A single down conversion I/Q mixer then translates the desired channel to DC. At baseband, an anti-aliasing filter is combined with a second 60 dB variable-gain amplifier to provide the first level of adjacent-channel rejection, as well as provide signal conditioning for interfacing into the dual 10-bit analog-todigital converters. Subsequent processing by the DSP provides final adjacent-channel rejection and audio/video carrier demodulation. The audio stream is FM-demodulated and passed to the audio output port, whereas the CVBS video stream is separated into component video and output onto the video data bus. Telegent Systems’ SureTrak™ DSP-based tuner architecture enables several unique features in the decoder that make it ideal for the mobile reception environment.
