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A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit

He Xiaofeng, Mo Taishan, Ma Chengyan and Ye Tianchun

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Abstract: An analog/digital reconfigurable automatic gain control (AGC) circuit with a novel DC offset cancellation circuit for a direct-conversion receiver is presented. The AGC is analog/digital reconfigurable in order to be compatible with different baseband chips. What's more, a novel DC offset cancellation (DCOC) circuit with an HPCF (high pass cutoff frequency) less than 10 kHz is proposed. The AGC is fabricated by a 0.18 μm CMOS process. Under analog control mode, the AGC achieves a 70 dB dynamic range with a 3 dB-bandwidth larger than 60 MHz. Under digital control mode, through a 5-bit digital control word, the AGC shows a 64 dB gain control range by 2 dB each step with a gain error of less than 0.3 dB. The DC offset cancellation circuits can suppress the output DC offset voltage to be less than 1.5 mV, while the offset voltage of 40 mV is introduced into the input. The overall power consumption is less than 3.5 mA, and the die area is 800 × 300 μm2.

Key words: automatic gain controlanalog/digital reconfigurableDC offset cancellation

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    Received: 18 August 2015 Revised: 25 September 2010 Online: Published: 01 February 2011

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      He Xiaofeng, Mo Taishan, Ma Chengyan, Ye Tianchun. A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit[J]. Journal of Semiconductors, 2011, 32(2): 025002. doi: 10.1088/1674-4926/32/2/025002 He X F, Mo T S, Ma C Y, Ye T C. A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit[J]. J. Semicond., 2011, 32(2): 025002. doi: 10.1088/1674-4926/32/2/025002.Export: BibTex EndNote
      Citation:
      He Xiaofeng, Mo Taishan, Ma Chengyan, Ye Tianchun. A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit[J]. Journal of Semiconductors, 2011, 32(2): 025002. doi: 10.1088/1674-4926/32/2/025002

      He X F, Mo T S, Ma C Y, Ye T C. A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit[J]. J. Semicond., 2011, 32(2): 025002. doi: 10.1088/1674-4926/32/2/025002.
      Export: BibTex EndNote

      A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit

      doi: 10.1088/1674-4926/32/2/025002
      • Received Date: 2015-08-18
      • Accepted Date: 2010-06-18
      • Revised Date: 2010-09-25
      • Published Date: 2011-01-10

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