SEMICONDUCTOR INTEGRATED CIRCUITS

A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer

Ye Xiangyang, Wang Yunfeng, Zhang Haiying and Wang Qingpu

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Abstract: This paper designs a binary-weighted programmable gain amplifier (PGA) with a DC offset cancellation (DCOC) circuit and an AB-class output buffer. The PGA adopts the circuit topology of a differential amplifier with diode-connected loads. Simulation shows that the performance of the PGA is not sensitive to temperature and process variation. According to test results, controlled by a digital signal of six bits, the PGA can realize a dynamic gain of -2 to 61 dB, and a gain step of 1 dB with a step error within ± 0.38 dB. The minimum 3 dB bandwidth is 92 MHz. At low-gain mode, IIP3 is 17 dBm, and a 1 dB compression point can reach 5.7 dBm. The DCOC circuit enables the amplifier to be used in a direct-conversion receiver and the AB-class output buffer circuit reduces the overall static power consumption.

Key words: PGADCOCAB class bufferbinary-weighted

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    Received: 20 August 2015 Revised: 05 September 2011 Online: Published: 01 February 2012

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      Ye Xiangyang, Wang Yunfeng, Zhang Haiying, Wang Qingpu. A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer[J]. Journal of Semiconductors, 2012, 33(2): 025003. doi: 10.1088/1674-4926/33/2/025003 Ye X Y, Wang Y F, Zhang H Y, Wang Q P. A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer[J]. J. Semicond., 2012, 33(2): 025003. doi: 10.1088/1674-4926/33/2/025003.Export: BibTex EndNote
      Citation:
      Ye Xiangyang, Wang Yunfeng, Zhang Haiying, Wang Qingpu. A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer[J]. Journal of Semiconductors, 2012, 33(2): 025003. doi: 10.1088/1674-4926/33/2/025003

      Ye X Y, Wang Y F, Zhang H Y, Wang Q P. A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer[J]. J. Semicond., 2012, 33(2): 025003. doi: 10.1088/1674-4926/33/2/025003.
      Export: BibTex EndNote

      A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer

      doi: 10.1088/1674-4926/33/2/025003
      • Received Date: 2015-08-20
      • Accepted Date: 2011-06-26
      • Revised Date: 2011-09-05
      • Published Date: 2012-01-20

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