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The document describes the design of a tunable continuous-time low-pass filter for a direct broadcast satellite tuner. A 7th-order Butterworth filter topology is used with a current-steering DAC to allow tuning the cutoff frequency from 4-40MHz. An on-chip phase-locked loop provides automatic tuning to maintain precise filtering characteristics despite process, temperature, and aging variations.

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A widely tunable continuous-time LPF for a direct conversion DBS Tuner تهیه و تنظیم : امین قرداشخانی
direct conversion DBS tuner ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The baseband LPF specification from system requirements , A: ,[object Object],[object Object],[object Object],[object Object]
The baseband LPF specification from system requirements, B: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
2. System design considerations ,[object Object],[object Object]
2.1 About the main filter topology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
2.2 About on chip automatic tuning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
3. Circuit design ,[object Object],[object Object],[object Object],[object Object]
Gm cell ,[object Object]
Gm cell ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
Main filter: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
the biquad ICF: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
the DAC: ,[object Object],[object Object],[object Object],[object Object]
the phase-detector: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Simulation result ,[object Object],[object Object],[object Object]
Simulation result ,[object Object]
Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
thanks

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