Here is a list with some publications and reports which I have been involved with in the past.
I have lost count, please check my Google Scholar for a more up to date list of publications...
Deyan Levski, Martin Waeny and Bhaskar Choubey, "A 1-us Ramp Time 12-bit Column-Parallel Flash TDC-Interpolated Single-Slope ADC with Digital Delay-Element Calibration", IEEE Transasctions on Circuits and Systems I: Regular Papers, Vol. PP, Issue: 99
Deyan Levski, Martin Waeny and Bhaskar Choubey, "A 12-bit Column-Parallel Flash TDC-Interpolated Ramp ADC with Online Digital Delay Element Correction", International Image Sensors Workshiop 2017
Deyan Levski, Martin Waeny and Bhaskar Choubey, "A 12-bit Column-Parallel Flash TDC-Interpolated Ramp ADC with Online Digital Delay Element Correction", International Image Sensors Workshiop 2017 - slides
Deyan Levski, Bhaskar Choubey, "A Conceptual 12-bit Column-Parallel Time-Domain Binary Search TDC-Interpolated Single-Slope ADC Architecture", Oxford Circuits and Systems Conference, 2017, Oxford UK - poster
Deyan Levski, Martin Waeny and Bhaskar Choubey, "Ramp Noise Projection in CMOS Image Sensor Single-Slope ADCs", IEEE Transactions on Circuits and Systems I: Regular Papers
Deyan Levski and Bhaskar Choubey, "On noise in time-delay integration CMOS image sensors", Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 989122 (May 13, 2016); doi:10.1117/12.2227320;
Deyan Levski, Tsvetomir Gotsov, Kamen Krastev, Aneliya Manukova, "Embedded Automatic Weather Station", Elektronika Magazine, Sigma-Not ISSN: 0033-2089
Investigations of Time-Interpolated Single-Slope Analog-to-Digital Converters for CMOS Image Sensors - DPhil Thesis, University of Oxford
A Cyclic Analog to Digital Converter for CMOS image sensors - MSc Thesis, Linköping University, ISRN: LiTH-ISY-EX--13/4674--SE; link to pdf.
Embedded TCP/IP Server for Automated Acquisition of Meteorological Data - BSc Thesis, University of Ruse
An introduction to ADCs for CMOS image sensors - seminar at the Open University, Milton Keynes, UK
Worst case resistor mismatch in an R-2R ladder DAC. Some basics.
Interpolation and Oversampling in Data Converters. Basic Trade-offs.
How does my computer work?, intro to CPUs for high-school students at Mathematics High-school, Ruse (in bulgarian)
CMOS integrated circuits and mixed-signal design, seminar at the 2015 Applied Electronics Forum, University of Ruse, (in bulgarian)
Music through the LPT port, practical lab notes for the 2015 Applied Electronics Forum, University of Ruse, (in bulgarian)
A Sparse Booth Encoding Technique
A Sparse Booth Encoding Technique - slides
Radix-4 Booth Encoded Multiplier
Web publication on the Automatic Weather Station
Image sensors - from the dinosaur age till the recent years (in Bulgarian)
Some solved problems on basic semiconductor theory
Some solved problems on basic PN junctions
Some solved problems on BJT and FET transistors
Some solved problems on basic Optoelectronic devices
The gm/id method for transistor sizing, simple notes