Preprint Article Version 1 This version is not peer-reviewed

A 14-bit Hybrid Incremental Sigma-Delta/Cyclic ADC for X-ray Linear Array Sensor

Version 1 : Received: 2 March 2017 / Approved: 2 March 2017 / Online: 2 March 2017 (08:37:48 CET)

How to cite: Niu, Y.; Zhang, Y.; Zhang, Z.; Fan, M.; Lu, W.; Chen, Z. A 14-bit Hybrid Incremental Sigma-Delta/Cyclic ADC for X-ray Linear Array Sensor. Preprints 2017, 2017030016 (doi: 10.20944/preprints201703.0016.v1). Niu, Y.; Zhang, Y.; Zhang, Z.; Fan, M.; Lu, W.; Chen, Z. A 14-bit Hybrid Incremental Sigma-Delta/Cyclic ADC for X-ray Linear Array Sensor. Preprints 2017, 2017030016 (doi: 10.20944/preprints201703.0016.v1).

Abstract

This paper presents a two-stage ADC based on pseudo-differential operational transconductance amplifier (OTA), which is designed for the readout circuit of X-ray linear array sensor. This hybrid ADC employs an incremental sigma-delta ADC and a cyclic ADC, achieving a good trade-off between accuracy and conversion speed. The two stages share the same hardware to reduce power consumption and die area. A common-mood feedback module is used to suppress the influence of charge injection, and the effectiveness is demonstrated by detailed theoretical analysis. A test chip of 14-bit ADC is fabricated in 0.35μm CMOS technology. The measured root mean square (RMS) value of DNL is 0.254 LSB, and the maximum value of INL is -0.776/+1.56 LSB. The measured effective number of bits (ENOB) is 13.43 bits.

Subject Areas

hybrid ADC; sigma-delta ADC; cyclic ADC; pseudo-differential OTA; X-ray sensor

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