A fully-integrated 0.13/spl mu/m CMOS low-IF DBS satellite tuner using a ring oscillator based frequency synthesizer

The first low-IF fully-integrated tuner for DBS satellite TV applications was realized in 0.13 mum CMOS. A wideband ring oscillator based frequency synthesizer having a large frequency step was used to down-convert a cluster of channels to a coarsely defined low-IF frequency, while the second down-conversion to baseband was performed in the digital domain. Eliminating the oscillator inductors has reduced the parasitic magnetic coupling, allowing a single-chip integration of the sensitive tuner and the noisy digital demodulator. A significant die area reduction was achieved by using a single oscillator to cover the entire satellite TV spectrum, while a noise attenuator was cascaded with the PLL loop filter to reduce the equivalent tuning gain

[1]  Gun-Su Kim,et al.  P-60: Reset Waveform for Dark-Room Contrast-Ratio Improvement , 2003 .

[2]  T. Tewksbury,et al.  A 480 MHz variable rate QPSK demodulator for direct broadcast satellite , 1997, 1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers.

[3]  B. Fransis,et al.  A fully integrated broadband direct-conversion receiver for DBS applications , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[4]  Bo-Eun Kim,et al.  A 9dBm IIP3 direct-conversion satellite broadband tuner-demodulator SOC , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[5]  H. Samueli,et al.  A single-chip universal digital satellite receiver with 480 MHz IF input , 1999, 1999 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition (Cat. No.99CH36278).