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Abstract:   (179 Views)
The performance of any system is decided by the circuit configurations used in its implementation. Current mirror is one of those circuit configurations which are widely used in analog system designs. The performance of current mirror is decided by its parameters which include large operating range, wide bandwidth along with very low input and very high output resistances. In this paper, a low voltage flipped voltage follower based current mirror is presented. The structure flipped voltage follower is initially modified using a feedback path which results in the low impedance node which when considered as input in the proposed current mirror results in an extremely low value of input resistance. Compared to conventional flipped voltage follower based current mirror design the proposed design works well with minimum error in microamperes range with extended bandwidth without affecting its output resistance. The input resistance gets scaled down to 17 ohms from 840 ohms whereas bandwidth gets almost doubled approximately to 4.5GHz from 2.4GHz. The power dissipation ranges in microwatts. The simulations are supported with mathematical analysis. The complete analysis is done in HSpice using MOS models of 0.18-micron technology at a dual supply voltage, ±0.5V.
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  • High performance sub-volt current mirror are widely used in building mixed-mode low power VLSI systems.
  • Current mirror designs based on flipped voltage follower can work at low supply voltage.
  • Modification is carried in conventional flipped voltage follower structure which resulted in low impedance nodes which here is utilized as an input.
  • Design of a current mirror using modified flipped voltage follower structure results in improved bandwidth and reduced input resistance without affecting other parameters.

Type of Study: Research Paper | Subject: Analog Circuits
Received: 2020/09/04 | Revised: 2020/11/13 | Accepted: 2020/11/26

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© 2021 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.