A 400 ps Input Time Range 2× Time Amplifier Using Time-to-Current Compensation Technique

2021 ◽  
Author(s):  
Mohammad Amin Yaldagard ◽  
Hossein Shamsi
Keyword(s):  
Time Range ◽  
Current Compensation ◽  
Compensation Technique ◽  
Input Time ◽  
Time Amplifier

scholarly journals Design of Reconfigurable Time-to-Digital Converter Based on Cascaded Time Interpolators for Electrical Impedance Spectroscopy

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1889
Author(s):  
Sounghun Shin ◽  
Yoontae Jung ◽  
Soon-Jae Kweon ◽  
Eunseok Lee ◽  
Jeong-Ho Park ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
High Frequency ◽  
Electrical Impedance ◽  
Phase Error ◽  
Electrical Impedance Spectroscopy ◽  
Time Range ◽  
Digital Converter ◽  
Frequency Range ◽  
Input Time ◽  
Interpolation Factor

This paper presents a reconfigurable time-to-digital converter (TDC) used to quantize the phase of the impedance in electrical impedance spectroscopy (EIS). The TDC in the EIS system must handle a wide input-time range for analysis in the low-frequency range and have a high resolution for analysis in the high-frequency range. The proposed TDC adopts a coarse counter to support a wide input-time range and cascaded time interpolators to improve the time resolution in the high-frequency analysis without increasing the counting clock speed. When the same large interpolation factor is adopted, the cascaded time interpolators have shorter measurement time and smaller chip area than a single-stage time interpolator. A reconfigurable time interpolation factor is adopted to maintain the phase resolution with reasonable measurement time. The fabricated TDC has a peak-to-peak phase error of less than 0.72° over the input frequency range from 1 kHz to 512 kHz and the phase error of less than 2.70° when the range is extended to 2.048 MHz, which demonstrates a competitive performance when compared with previously reported designs.

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