SEMICONDUCTOR INTEGRATED CIRCUITS

A widely tunable continuous-time LPF for a direct conversion DBS tuner

Chen Bei, Chen Fangxiong, Ma Heping, Shi Yin and Dai F F

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Abstract: A continuous-time 7th-order Butterworth Gm–C low pass filter (LPF) with on-chip automatic tuning circuit has been implemented for a direct conversion DBS tuner in 0.35 µm SiGe BiCMOS technology. The filter’s 3 dB cutoff frequency can be tuned from 4 to 40 MHz. A novel on-chip automatic tuning scheme has been successfully realized to tune and lock the filter’s cutoff frequency. Measurement results show that the filter has 0.5 dB passband gain, +/–5% bandwidth accuracy, 30 nV/Hz1/2 input referred noise, 3 dBVrms passband IIP3, and 27 dBVrms stopband IIP3. The I/Q LPFs with the tuning circuit draw 13 mA (with MHz) from 5 V supply, and occupy 0.5 mm2.

Key words: active filters

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    Received: 18 August 2015 Revised: 04 August 2008 Online: Published: 01 February 2009

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      Chen Bei, Chen Fangxiong, Ma Heping, Shi Yin, Dai F F. A widely tunable continuous-time LPF for a direct conversion DBS tuner[J]. Journal of Semiconductors, 2009, 30(2): 025009. doi: 10.1088/1674-4926/30/2/025009 Chen B, Chen F X, Ma H P, Shi Y, Dai F F. A widely tunable continuous-time LPF for a direct conversion DBS tuner[J]. J. Semicond., 2009, 30(2): 025009. doi:  10.1088/1674-4926/30/2/025009.Export: BibTex EndNote
      Citation:
      Chen Bei, Chen Fangxiong, Ma Heping, Shi Yin, Dai F F. A widely tunable continuous-time LPF for a direct conversion DBS tuner[J]. Journal of Semiconductors, 2009, 30(2): 025009. doi: 10.1088/1674-4926/30/2/025009

      Chen B, Chen F X, Ma H P, Shi Y, Dai F F. A widely tunable continuous-time LPF for a direct conversion DBS tuner[J]. J. Semicond., 2009, 30(2): 025009. doi:  10.1088/1674-4926/30/2/025009.
      Export: BibTex EndNote

      A widely tunable continuous-time LPF for a direct conversion DBS tuner

      doi: 10.1088/1674-4926/30/2/025009
      • Received Date: 2015-08-18
      • Accepted Date: 2008-08-04
      • Revised Date: 2008-08-04
      • Published Date: 2009-02-16

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