An Ultra Low Power CMOS Sigma Delta ADC Modulator for System-on-chip (SoC) Temperature Sensor for Aerospace Applications

In the current paper, an accurate with low power consumed sigma delta (ΣΔ) analog to digital converter has been designed for the aerospace applications. The sigma delta ADC has been designed in such a way that it works fine with consumption of low power and high accuracy in the system on chip (SoC) temperature sensor where the analog output from the temperature sensor unit will be the fed to the analog to digital converter. To check the robustness, different parameters with variation has been analyzed. The high gain operational amplifier plays a vital role in the circuits design. Hence, a 30 MHz operational amplifier has also been proposed whose unity gain bandwidth (UGB) has been observed of about 30 MHz, 51.1dB dc gain and slew rate (SR) of about 27.9 V/ μsec. For the proper operation of the circuit, a power supply of +1.3V to -1.3V is used. The proposed sigma delta ADC modulator is showing better results over previously designed modulator in terms of power consumption, error and performance. The design and simulation have been tested with the help of cadence analog design environment with UMC 90nm CMOS process technology.

[1]  Li Gang,et al.  A High Performance Sigma-Delta ADC for Audio Decoder Chip , 2013 .

[2]  K. Lokesh Krishna,et al.  A 1V second order delta sigma ADC in 130nm CMOS , 2014, International Conference on Information Communication and Embedded Systems (ICICES2014).

[3]  Martin Clara,et al.  A 6bit, 1.2GSps Low-Power Flash-ADC in 0.13µm Digital CMOS , 2004, DATE.

[4]  Vratislav Michal,et al.  Design of CMOS analog integrated circuits as readout electronics for High-TC superconductor and semiconductor terahertz bolometric sensors , 2006 .

[5]  Wenhua Yang,et al.  A 3-V 340-mW 14-b 75-Msample/s CMOS ADC with 85-dB SFDR at Nyquist input , 2001, IEEE J. Solid State Circuits.

[6]  Rekha Agrawal,et al.  Low Power 8 bit Analog to Digital Converter (ADC) in 180 nm CMOS Technology , 2013 .

[7]  Siti Hawa Ruslan,et al.  A 93.36 dB, 161 MHz CMOS Operational Transconductance Amplifier (OTA) for a 16 Bit Pipeline Analog-to-Digital Converter (ADC) , 2011 .

[8]  Syed Abdul Sattar,et al.  Design of Low Power Sigma Delta ADC , 2012, VLSIC 2012.

[9]  Yang Shaojun,et al.  The design of a multi-bit sigma-delta ADC modulator , 2013, Proceedings of 2013 2nd International Conference on Measurement, Information and Control.

[10]  Remya Thankachan,et al.  Design of 1-Bit DAC for Delta-Sigma Modulator , 2015 .

[11]  Labonnah F. Rahman,et al.  Design of 3-Bit ADC in 0.18 µm CMOS Process , 2014 .

[12]  Dattaguru V. Kamath.  Overview of OPAMP and OTA based Integrators , 2015 .

[13]  John J. Paulos,et al.  An analysis of nonlinear behavior in delta-sigma modulators , 1987 .

[14]  James C. Candy,et al.  Decimation for Sigma Delta Modulation , 1986, IEEE Trans. Commun..

[15]  R. Schreier,et al.  Delta-sigma data converters : theory, design, and simulation , 1997 .