Analog & Mixed Signal Circuits Group

Department of Electronics and Communication Engg. IIT Roorkee


Saravana Kumar Manivannan

I am an Assistant Professor in the Microelectronics and VLSI group, Deparment of Electronics and Communication Engineering (ECE), of Indian Institute of Technology (IIT) Roorkee. I work in the area of Analog and Mixed signal integrated circuit (IC) design with special focus on high performance and high bandwidth data converters.

About myself

I received my Bachelor's degree in Electronics and Communication Engineering from the Madras Institute of Technology, Anna University, Chennai, in 2009, and the M.Tech degree from the Indian Institute of Technology Delhi, New Delhi, in 2011. From 2011 to 2014, I worked as a Design Engineer at Analog Devices, Bengaluru, India, where I worked on high speed chip-to-chip serial link communication. I obtained my PhD degree from the Indian Institute of Technology Madras, Chennai, in 2021, under Prof. Shanthi Pavan, in the area of data-converter design. I have also served as a Senior Project Officer in the Centre for Industrial Consultancy and Sponsored Research (IC & SR), IIT Madras, where I worked on high performance analog filters.

Jan-May 2022

  1. ECN252 - Digital Electronics Laboratory (jointly with Dr. Sparsh Mittal)
  2. ECN584 - Mixed Signal Circuit Design

July-Nov 2022

  1. ECN581 - Analog VLSI Circuit Design

Jan-May 2023

  1. ECN205 - Analog Circuits (jointly with Prof. Sourajeet Roy)
  2. ECN584 - Mixed Signal Circuit Design

July-Nov 2023

  1. ECN341 - Microelectronic Devices, Technology and Circuits Laboratory (jointly with Prof. Anand Bulusu)
  2. ECN581 - Analog VLSI Circuit Design

Journal publications

  1. N. Basavaraj, S. Manivannan and S. Pavan, "Simplified Simulation and Measurement of the Signal Transfer Function of a Continuous-Time Pipelined Analog-to-Digital Converter," in IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 69, no. 10, pp. 3993-3997, Oct. 2022, doi: 10.1109/TCSII.2022.3179772.
  2. S. Manivannan and S. Pavan, "Improved Multistage Continuous-Time Pipelined Analog-to-Digital Converters and the Implicit Decimation Property," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 69, no. 8, pp. 3102-3113, Aug. 2022, doi: 10.1109/TCSI.2022.3173563.
  3. S. Pavan and S. Manivannan, "Analysis of RC Time-Constant Variations in Continuous-Time Pipelined ADCs," in IEEE Transactions on Circuits and Systems I: Regular Papers, doi: 10.1109/TCSI.2021.3121418.
  4. S. Manivannan and S. Pavan, "A 65-nm CMOS Continuous-Time Pipeline ADC Achieving 70-dB SNDR in 100-MHz Bandwidth," in IEEE Solid-State Circuits Letters, vol. 4, pp. 92-95, 2021, doi: 10.1109/LSSC.2021.3071965.
  5. S. Manivannan and S. Pavan, "Improved Continuous-Time Delta-Sigma Modulators With Embedded Active Filtering," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 67, no. 11, pp. 3778-3789, Nov. 2020, doi: 10.1109/TCSI.2020.3013006.
  6. S. Manivannan and S. Pavan, "Degradation of Alias Rejection in Continuous-Time Delta–Sigma Modulators by Weak Loop-Filter Nonlinearities," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 65, no. 10, pp. 3207-3215, Oct. 2018, doi: 10.1109/TCSI.2018.2826443.

Conference publications

  1. C. Kumar, S. Manivannan and S. Pavan, "Analysis of Flash ADC Loading on the Performance of a Continuous-Time Pipelined ADC," 2022 IEEE International Symposium on Circuits and Systems (ISCAS), 2022, pp. 2792-2796, doi: 10.1109/ISCAS48785.2022.9937563.
  2. S. Manivannan and S. Pavan, "A 1 MHz bandwidth, filtering continuous-time delta-sigma ADC with 36 dBFS out-of-band IIP3 and 76 dB SNDR," 2018 IEEE Custom Integrated Circuits Conference (CICC), 2018, pp. 1-4, doi: 10.1109/CICC.2018.8357089.
  3. S. Manivannan and S. Pavan, "Degradation of Alias Rejection in Continuous-Time Bandpass Delta-Sigma Converters due to Weak Loop Filter Nonlinearities," 2019 IEEE International Symposium on Circuits and Systems (ISCAS), 2019, pp. 1-5, doi: 10.1109/ISCAS.2019.8702763.
  4. S. Kumar and S. Chatterjee, "A 110-dB Dynamic Range, 76-dB Peak SNR Companding Continuous-Time Delta Sigma Modulator for Audio Applications," 2012 25th International Conference on VLSI Design, 2012, pp. 51-56, doi: 10.1109/VLSID.2012.45.
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Layout snapshot of a 1MHz CTDSM ADC for Bluetooth RX
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PCB snapshot and Measurement setup to test the CTDSM ADC
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Chip micrograph of the 100MHz bandwidth CT pipelined ADC for LTE RX
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Measurement setup to test the CT pipelined ADC

Analog circuit design is an art. It is a perfect blend of diverse fields of ECE such as circuit theory, device physics and signal processing. It also requires a strong background of mathematics. An analog circuit designer needs to be methodical in his/her work and also eager to work hard. In this era of digital world, the analog blocks are equally critical as they form the interface between the real world (which is analog) and the computation intensive digital processors. This presents a lot of design challenges and is therefore an exciting field of research. An analog designer also gets lucrative jobs in the semiconductor industry due to his/her unique skillset.

IIT Roorkee offers M.Tech and Ph.D programmes, the details of which can be found here and here. Typically, admissions happen twice a year and the candidate needs to have a valid (and of course, good!) GATE score to apply. Highly motivated B.Tech students are also welcome to do projects in our group.

Our group focusses on the design of high performance analog blocks especially data converters. A typical IC design flow starts with the conceptualization of an idea, followed by extensive model simulations to verify it. The next step is the circuit design and layout in an industry standard process technology. The design is then sent for fabrication. The fabricated chip is then validated through measurements by mounting it on a custom designed printed circuit board (PCB). The measurement results are then published in a reputed journal/conference. (Some images of my Ph.D work can been seen in the left.)

If you interested in a career in Analog/Mixed Signal IC design and are motivated to do research in this exciting area, kindly get in touch with me with your CV.

Office

Dr. Saravana Kumar M

S319, Dept. of Electronics and Communication Engineering,

Indian Institute of Technology, Roorkee

Roorkee - 247667, Haridwar distt., Uttarakhand, India.

Email : saravana.kumar@ece.iitr.ac.in

Ph-No : (91) 01332-28-5460