Variable Fast Transient Digitizer

Document Type

Conference Proceeding

Publication Date


Publication Title

2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS)


Institute of Electrical and Electronics Engineers

Publisher Location

Dallas, TX



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A low cost, low power substitute for expensive, high power high-speed analog-to-digital converters (ADCs) in some situations is presented. This circuit is called a variable fast transient digitizer (VFTD). This paper provides an overview of the design and measured test results. The VFTD is designed to sample a high-speed analog input signal and later reconstruct the captured signal at a much slower rate, for example, around three orders of magnitude. This approach eliminates quantization error in the captured signal. Further, this approach enables the use of slow, low cost, analog-to-digital converters such as those found in microcontrollers. The VFTD discussed in this paper uses 256 sequential sample and hold cells with a process dependent variable delay element controlled by an off-chip voltage source. Using a power supply voltage of 5V the input range extends from 0 V to 3 V corresponding to an output voltage range from 2 V to 5 V, a capture window range from 81 ns to 1.78 µs, and a sampling rate range from 143.82 MS/s to 3.16 GS/s. The VFTD is fabricated on a 2 mm x 2 mm die using ON Semiconductor's 0.5 µm C5 process and requires a 0.5 mm x 1.5 mm area.


Electrical and Electronics | VLSI and Circuits, Embedded and Hardware Systems



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