development of a satellite tv receiver for fibre optic ... · frequency stack all satellite tv...
TRANSCRIPT
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Development of a Satellite TV receiver for fibre optic
distribution system
Graham Leach
Riverbeck Ltd, UK.
13th June 2016
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What’s the problem?• You’ve won a contract to provide satellite TV
reception to every room of a large block of flats
• How do you wire up the building?
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Legacy installCoax cabling can not carry satellite TV bandwidth. Need one cable per satellite band to switch matrix
Significant loss and frequency tilt in long cable runs
Gain stages needed to maintain C/N
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The untidy install looks like this…
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Proposed Solution
Frequency stack all satellite TV bands on low loss fibre optic.
System pioneered by Global Invacom.
Passive split optical signal. Fibre optic immune to electrical interference.
Frequency destack device powered by set top box
Frequency bands must appear to STB as if directly connected to LNB
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Architecture• Homodyne down conversion
• Wideband continuous time filter to clean spectrum
• Homodyne up conversion and output buffer
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Chip Floorplan
FC-QFN12QFN40 with 12 downbonds
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Oscillator / PLL• Fractional N charge pump based phased lock loop RX LO 1.45GHz – 4.925GHz
TX LO 1.45GHz – 1.625GHz
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Gain / Filter stages• Gain disturbed in multiple stages. 15dB - >45dB
• Channel Filter. 3rd order Butterworth. Fc 500 MHz – 720 MHz
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Up integration of circuits
• At project start first generation product already in market
• Riverbeck contracted to integrate RF / analogue functionality to• Reduce cost
• Protect IP
• Reduce form factor
• Lower power consumption
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A successful up integration project