SEMICONDUCTOR INTEGRATED CIRCUITS

A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends

Hong Zhang1, Jie Zhang1, Mudan Zhang1, Xue Li2 and Jun Cheng1,

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 Corresponding author: Jun Cheng, E-mail: jcheng@mail.xjtu.edu.cn

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Abstract: A multifunctional programmable gain amplifier (PGA) that provides gain and offset adjusting abilities for high-definition video analog front-ends (AFE) is presented. With a switched-capacitor structure, the PGA also acts as a sample and holder of the analog-to-digital converter (ADC) in the AFE to reduce the power consumption and chip area of the whole AFE. Furthermore, the PGA converts the single-ended video signal into differential signal for the following ADC to reject common-mode noise and interferences. The 9-bit digital-to-analog converter (DAC) for gain and offset adjusting is embedded into the switched capacitor networks of the PGA. A video AFE integrated circuit based on the proposed PGA is fabricated in a 0.18-μm process. Simulation and measurement results show that the PGA achieves a gain control range of 0.90 to 2.34 and an offset control range of —220 to 220 mV while consuming 10.1 mA from a 1.8 V power supply.

Key words: PGAswitched capacitorAFEoffset adjustmentembedded DAC



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Fig. 1.  The topology that processes a single video signal component in a typical video AFE.

Fig. 2.  Topology of the proposed PGA.

Fig. 3.  Half circuit architecture of the 9-bit gain and offset DAC.

Fig. 4.  Schematic of the OTA in the proposed PGA.

Fig. 5.  Input CM level compensation circuit.

Fig. 6.  Simulation of OTA.

Fig. 7.  Rejection of the variation of the input CM level.

Fig. 8.  Simulated results of gain adjustment.

Fig. 9.  Simulated results of offset adjustment.

Fig. 10.  Spectrum of the PGA output signal.

Fig. 11.  Main part of the AFE chip.

Fig. 12.  AFE measurement setup.

Fig. 13.  Measured ADC output under different gain words. (a) G[8:0] $=$ 9'b111111111. (b) G[8:0] $=$ 9'b100000000. (c) G[8:0] $=$ 9'b000000000.

Fig. 14.  Measured gain adjustment characteristics.

Fig. 15.  Performance verification of the AFE chip.

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Table 1.   Performance comparison of the phase shifter.

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    Received: 15 August 2014 Revised: Online: Published: 01 March 2015

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      Hong Zhang, Jie Zhang, Mudan Zhang, Xue Li, Jun Cheng. A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends[J]. Journal of Semiconductors, 2015, 36(3): 035002. doi: 10.1088/1674-4926/36/3/035002 H Zhang, J Zhang, M D Zhang, X Li, J Cheng. A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends[J]. J. Semicond., 2015, 36(3): 035002. doi: 10.1088/1674-4926/36/3/035002.Export: BibTex EndNote
      Citation:
      Hong Zhang, Jie Zhang, Mudan Zhang, Xue Li, Jun Cheng. A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends[J]. Journal of Semiconductors, 2015, 36(3): 035002. doi: 10.1088/1674-4926/36/3/035002

      H Zhang, J Zhang, M D Zhang, X Li, J Cheng. A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends[J]. J. Semicond., 2015, 36(3): 035002. doi: 10.1088/1674-4926/36/3/035002.
      Export: BibTex EndNote

      A multifunctional switched-capacitor programmable gain amplifier for high-definition video analog front-ends

      doi: 10.1088/1674-4926/36/3/035002
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      Project supported by the National Natural Science Foundation of China (No. 61106027), and the Science and Technology Project of Shanxi Province (No. 2014K05-14).

      More Information
      • Corresponding author: E-mail: jcheng@mail.xjtu.edu.cn
      • Received Date: 2014-08-15
      • Accepted Date: 2014-09-22
      • Published Date: 2015-01-25

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