This thesis focuses on the design of CMUT-CMOS interface compact & low power analog front ICs in deep
submicron technologies from conventional continuous time mode circuit topologies to sampling mode circuit topologies for high
frequency (30 MHz center frequency and bandwidth of 15-45 MHz) catheter based medical ultra sound imaging systems.
The thesis consists of six research papers that are accepted or intended for an international journal or
proceedings by me as a first author. These papers cover the analysis, design and experimental evaluation of nanoscale front-end
amplifiers for medical ultrasound imaging. Two tapeouts were made during my PhD research work, the first tapeout (Alabama)
and the second tapeout (Cincinnati),
both in 90 nm CMOS technology. First Tapeout Alabama
has folded cascode amplifier (which was later used in front-end amplifiers in Cincinnati tapeout) and tested the DC performance. Second Tapeout
Cincinnati has four front-end amplifiers (two front-ends are based on charge sampling
and the other two are continuous time mode front-ends).
1. C.Linga Reddy and Trond Ytterdal, ”Clock
jitter impact on the performance of general charge sampling amplifiers,” Journal of Analog Integrated Circuits and Signal
Processing, August, 2009 (Accepted).
2. C.Linga Reddy, Tajeshwar Singh and Trond Ytterdal,
1V Transimpedance Amplifier in 90nm CMOS for Medical Ultrasound Imaging,”
IEEE NORCHIP – 2009.
3. C.Linga Reddy and Trond Ytterdal, ”1V Transimpedance Amplifier in 90nm CMOS for Medical Ultrasound
Imaging,” IEEE NORCHIP – 2009.
4. Yamaner, Yalšın
Feysel and Cenkeramaddi, Linga Reddy et. al., “Front-end IC design for intravascular
ultrasound imaging,” PhD. Research in Microelectronics and Electronics, IEEE PRIME 2008., Boğaziši Un'versity, Istanbul.
Bozkurt, C.Linga Reddy, F.Yalcin Yamaner and Trond Ytterdal ”A Low Noise Capacitive Feedback Analog Front-end for
cMUT based IVUS: Experimental Results,” 7th International workshop on Micromachined Ultrasonic Transducers, May 8-9, 2008.
6. B.B.Larsen and C.Linga Reddy, "Mixed Signal
IC Design," 7th European workshop on Microelectronics Education (EWME-2008), May 28 - 30, 2008.
7. C.Linga Reddy, Ayhan Bozkurt, Yalacin Yamaner
and Trond Ytterdal, “A Low Noise Capacitive Feedback Analog Front-end for CMUTs in IVUS Imaging,” IEEE Ultrasonics
8. B.B.Larsen, C.Linga Reddy and Jukka Typpo,
”Readout and Control Circuit for a Four Pixel Digital Camera as Semester Project,” IEEE International Conference
on Microelectronic System Education, June 2-4, 2007.
9. Ayhan Bozkurt, F.Yalcin Yamaner and C.Linga
Reddy, ”IC Design for 2D cMUT Arrays: High voltage CMOS Design Issues, Experimental Results and New Amplifier Topologies,” 6th
International workshop on Micromachined Ultrasonic Transducers, May 25-27,
10. C.Linga Reddy and Trond Ytterdal, ”Analysis
and Design of a 1V Charge Sampling Readout Amplifier in 90nm CMOS for Medical Imaging,” IEEE VLSI-DAT, April 25-27, 2007.
11. C.Linga Reddy,
Tajeshwar Singh and Trond Ytterdal, ”Self-biased Charge Sampling Amplifier in 90nm CMOS for Medical Ultrasound
Imaging,” IEEE GLSVLSI, March 11-13, 2007.
12. C.Linga Reddy
and Trond Ytterdal, ”Jitter Analysis of General Charge Sampling Amplifiers,” IEEE ISCAS, 2006.
13. Thomas Halvorsr°d,
C.Linga Reddy, Arne R°nnekleiv and Trond Ytterdal, “A Discrete Time ÁBeamformer for CMUT Arrays – Behavioral Simulations
Using SystemC,” IEEE Ultrasonics Symposium, 2005.