Abstract
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.
Highlights
All-pass filters as delay cells have a variety of applications in signal processing and communication systems, like equalizers and analog/RF beam-formers [1,2,3,4,5,6]
There are many voltage-mode all-pass filters reported over the last one decade, which operate in broadband frequencies and have different applications [15,16,17,18,19,20,21]
E.g., RF beam-forming, delay stages as delay cells are normally realized by cascading first-order all-pass filters in order to achieve a desired delay [15,16,17]
Summary
All-pass filters as delay cells have a variety of applications in signal processing and communication systems, like equalizers and analog/RF beam-formers [1,2,3,4,5,6]. There are just a few first-order voltage-mode all-pass filters for wide frequency ranges in the literature [15,16,17,22] This is because these analog circuits should possess important specifications like wide bandwidth, efficient area, low cost, and power consumption, and high delay amount to be considered as practical and efficient systems. The proposed all-pass filter is comprised of two transistors, two resistors, and one grounded inductor This circuit demonstrates a large amount of delay in a single delay cell through a wide frequency band.
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