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Ring Oscillator Delay Simulation

Author: PengXingWei
Tutor: HuangQiZuo;HuangJunCheng
School: Shanghai Jiaotong University
Course: Software Engineering
Keywords: SPICE model netlist delay ring oscillator
CLC: TN752
Type: Master's thesis
Year: 2007
Downloads: 99
Quote: 0
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Abstract


When do ring oscillator simulation, the devices DC parameter (such as mobilityμ0, threshold voltage vth) and AC parameter (such as gate oxide thickness tox, gate and source/drain overlap capacitance cgso/cgdo) will impact its delay. AC parameter has more serious impacts to sub-micron device. On the one hand, devices delay decrease when device scales down. On the other hand, because of the scaling down of device critical line, the dielectric layer becomes thinner and the metal line density increases at the same time, results in Interconnect delay increasing. So, interconnect delay plays a more and more important role in circuit simulation when devices scale down. It means that the weight of parasitic RC (resistance and capacitance) of interconnect increases.The parasitic RC of devices and interconnect can be modeled by device model and circuit netlist in circuit simulation. But usually the method to distinguish and calculate the parasitic RC isn’t correct. It results double count or miss the parasitic RC of devices and interconnect combined part. Because the weight of the parasitic RC increases when devices scales down, there is more error in circuit simulation.In this work, we studied how to distinguish and calculate the parasitic RC of devices and interconnect. And the key was to distinguish the parasitic RC of local interconnect and devices. We extracted the parasitic RC at different parts of 90nm devices, and did the ring oscillator delay simulation to find out their impact on delay. We also proposed some different test structures which help to calculate the device parasitic RC more accurately. As a result, a more accurate circuit simulation was achieved.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Oscillation technique,the oscillator > Oscillator
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