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5GHz CMOS All-Pass Filter-Based True Time Delay Cell

Department of Electronics Engineering, Technical University of Catalonia (UPC)-BarcelonaTech, 08034 Barcelona, Spain
Department of Electronics Engineering, University of Guilan, 4199613776 Rasht, Iran
Author to whom correspondence should be addressed.
Electronics 2019, 8(1), 16;
Received: 9 November 2018 / Revised: 20 December 2018 / Accepted: 21 December 2018 / Published: 22 December 2018
(This article belongs to the Special Issue Signal Processing and Analysis of Electrical Circuit)
PDF [2749 KB, uploaded 22 December 2018]


Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the best candidates to approximate time delays. This paper proposes a broadband first-order voltage-mode all-pass filter as a true-time-delay cell. The proposed true-time-delay cell is capable of tuning delay, demonstrating its potential capability to be used in different systems, e.g., RF beam-formers. The proposed filter achieves a flat group delay of over 60 ps with a pole/zero pair located at 5 GHz. This proposed circuit consumes only 10 mW power from a 1.8-V supply. To demonstrate the performance of the proposed all-pass filter, simulation results are conducted by using Virtuoso Cadence in a standard TSMC 180-nm CMOS process. View Full-Text
Keywords: all-pass filter; CMOS; time delay; broadband; true-time-delay all-pass filter; CMOS; time delay; broadband; true-time-delay

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Aghazadeh, S.R.; Martinez, H.; Saberkari, A. 5GHz CMOS All-Pass Filter-Based True Time Delay Cell. Electronics 2019, 8, 16.

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