Simulation and Analysis of a Digitally Controlled Differential Delay Circuit Under Process, Voltage, Temperature and Noise Due to Injection of High Current.
In: Journal of Circuits, Systems & Computers, Jg. 31 (2022-11-15), Heft 16, S. 1-30
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Zugriff:
A three bit digitally controlled differential delay circuit is investigated in this work. The circuit is coupled to a normal high current power delivery network (PDN), which is capable of coming up from sleep mode (0 A) to 10 or 30 A or else 50 A in 10 ns. Simulated in a 0.09- μ m CMOS process and power supply voltage ( V dd ) of 1.1 V, the proposed circuit in post-layout can operate from 435.5 ps to 152.2 ps. The corresponding input vector (CBA) during this period switches from 000 to 111. Further, there are also intermediate states as the delay varies between the said ranges. These values of delay being dependent on the input vector has been noted to reduce monotonically. In addition to that, the post-layout delay sustains a shift of 4.0 and 6.5 ps for NN and SS process corner, respectively, following a ± 1 0 ∘ C change in temperature. But an abrupt high current I (t) pumped into the chip causes the voltage ( V p ) near the device to drop due to PDN. It also fluctuates with the natural frequency of PDN. The noise so developed induces jitter in the output swing and causes more delay between input and output in comparison to the circuit designed with zero noise in power supply. The jitter achieved for a current ramp I (t) of 0–50 A in 10 ns for the two vector CBA happens to be around 5.0 and 4.4 ps, respectively. The current ramp also generates power supply noise of 0.468 V occurring close to the silicon chip. This, in turn, corresponds to a V p of 0.642 V near the die, appearing to be much less than the required V dd of 1.1 V. Therefore, the delay is found to be affected significantly due to the sudden current ramp. It is also noted that a constant DC voltage of 0.642 V has quite different effect on delay and jitter than a fluctuating AC noise having the first droop same as that DC voltage. [ABSTRACT FROM AUTHOR]
Titel: |
Simulation and Analysis of a Digitally Controlled Differential Delay Circuit Under Process, Voltage, Temperature and Noise Due to Injection of High Current.
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Autor/in / Beteiligte Person: | Kumar, Mithilesh ; Majumder, Alak ; Mondal, Abir J |
Zeitschrift: | Journal of Circuits, Systems & Computers, Jg. 31 (2022-11-15), Heft 16, S. 1-30 |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 0218-1266 (print) |
DOI: | 10.1142/S0218126622502760 |
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