SEMICONDUCTOR INTEGRATED CIRCUITS

A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC

Tong Xingyuan, Yang Yintang, Zhu Zhangming and Sheng Wenfang

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Abstract: Based on a 5 MSBs (most-significant-bits)-plus-5 LSBs (least-significant-bits) CR hybrid D/A conversion and low-offset pseudo-differential comparison approach, with capacitor array axially symmetric layout topology and resistor string low gradient mismatch placement method, an 8-channel 10-bit 200-kS/s SAR ADC (successive-approximation-register analog-to-digital converter) IP core for a touch screen SoC (system-on-chip) is implemented in a 0.18 μm 1P5M CMOS logic process. Design considerations for the touch screen SAR ADC are included. With a 1.8 V power supply, the DNL (differential non-linearity) and INL (integral non-linearity) of this converter are measured to be about 0.32 LSB and 0.81 LSB respectively. With an input frequency of 91 kHz at 200- kS/s sampling rate, the spurious-free dynamic range and effective-number-of-bits are measured to be 63.2 dB and 9.15 bits respectively, and the power is about 136 μW. This converter occupies an area of about 0.08 mm2. The design results show that it is very suitable for touch screen SoC applications.

Key words: analog-to-digital converterSARtouch screen SoCCMOS integrated circuitslow power

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    Received: 18 August 2015 Revised: 13 May 2010 Online: Published: 01 October 2010

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      Tong Xingyuan, Yang Yintang, Zhu Zhangming, Sheng Wenfang. A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC[J]. Journal of Semiconductors, 2010, 31(10): 105009. doi: 10.1088/1674-4926/31/10/105009 Tong X Y, Yang Y T, Zhu Z M, Sheng W F. A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC[J]. J. Semicond., 2010, 31(10): 105009. doi:  10.1088/1674-4926/31/10/105009.Export: BibTex EndNote
      Citation:
      Tong Xingyuan, Yang Yintang, Zhu Zhangming, Sheng Wenfang. A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC[J]. Journal of Semiconductors, 2010, 31(10): 105009. doi: 10.1088/1674-4926/31/10/105009

      Tong X Y, Yang Y T, Zhu Z M, Sheng W F. A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC[J]. J. Semicond., 2010, 31(10): 105009. doi:  10.1088/1674-4926/31/10/105009.
      Export: BibTex EndNote

      A 10-bit 200-kS/s SAR ADC IP core for a touch screen SoC

      doi: 10.1088/1674-4926/31/10/105009
      • Received Date: 2015-08-18
      • Accepted Date: 2010-04-05
      • Revised Date: 2010-05-13
      • Published Date: 2010-10-05

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