J. Semicond. > 2008, Volume 29 > Issue 4 > 686-692

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A High Precision CMOS Opamp Suitable for ISFET Readout

Zhang Chong, Yang Haigang and Wei Jinbao

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Abstract: This paper presents a high precision CMOS opamp suitable for ISFET readout.The opamp is tailored to provide a constant bias condition for ISFET as part of the readout circuits and,hence,is compatible for single chip integration with the sensor.A continuous time auto-zero stabilization technique is studied and employed,with the aim of suppressing the low frequency noises,including the offset voltage,1/f noise,and temperature drift.The design is based on a 0.35μm CMOS process.With a 3.3V power supply,it maintains a DC open loop gain of more than 100dB and an offset voltage of around 11μV,while the overall power dissipation is only 1.48mW.With this opamp,a pH microsensor is constructed,of which the functionality is verified by experimental tests.

Key words: high precisionauto-zerooperational amplifierISFET microsensor

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    Zhang Chong, Yang Haigang, Wei Jinbao. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. Journal of Semiconductors, 2008, 29(4): 686-692.
    Zhang C, Yang H G, Wei J B. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. J. Semicond., 2008, 29(4): 686.
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    Received: 18 August 2015 Revised: 26 November 2007 Online: Published: 01 April 2008

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      Zhang Chong, Yang Haigang, Wei Jinbao. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. Journal of Semiconductors, 2008, 29(4): 686-692. ****Zhang C, Yang H G, Wei J B. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. J. Semicond., 2008, 29(4): 686.
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      Zhang Chong, Yang Haigang, Wei Jinbao. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. Journal of Semiconductors, 2008, 29(4): 686-692. ****
      Zhang C, Yang H G, Wei J B. A High Precision CMOS Opamp Suitable for ISFET Readout[J]. J. Semicond., 2008, 29(4): 686.

      A High Precision CMOS Opamp Suitable for ISFET Readout

      • Received Date: 2015-08-18
      • Accepted Date: 2007-04-20
      • Revised Date: 2007-11-26
      • Published Date: 2008-04-03

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