Digital potentiometers are substantial components for the design of many mixed-signal electronic circuits and systems. Their capability to program resistance value almost instantly provides hardware designers an additional level of freedom. Unfortunately, this feature is limited to DC and lower frequencies, due to parasitic effects. Nowadays, memristors as continuously tunable resistors are becoming candidates for potentiometer successors. Memristors are two-terminal non-volatile devices which have less significant parasitic effects and a wide resistance range. The memristance value can be changed on the fly. Using nanotechnology, memristor implementation has a nanoscale footprint with nanosecond transition between resistive states. In this paper, we present a comparison between the frequency characteristics of digital potentiometers and the only commercially available memristors. Memristor parasitic effects dominate at higher frequencies which extends the bandwidth. In order to present the advantages of memristive circuits, we have analyzed and implemented tunable circuits such as a voltage divider, an inverting amplifier, a high-pass filter, and a phase shifter. A commercially available memristor by KnowM Inc. is used for this purpose. Experimental results obtained by the measurements verify that a memristor has equal or better characteristics than a digital potentiometer. Memristive realizations of voltage dividers and inverting amplifiers have a wider bandwidth, while filters and phase shifters with a memristor have almost identical frequency characteristics as the corresponding realizations with a digital potentiometer.

中文翻译：

---

忆阻器，替代电路中的数字电位计

数字电位器是许多混合信号电子电路和系统设计的重要组成部分。他们编程电阻值的能力几乎立即为硬件设计人员提供了额外的自由度。不幸的是，由于寄生效应，此功能仅限于DC和较低的频率。如今，作为连续可调电阻器的忆阻器已成为电位计后续产品的候选产品。忆阻器是两端非易失性器件，具有较小的寄生效应和宽电阻范围。忆阻值可以随时更改。使用纳米技术，忆阻器实现具有电阻状态之间纳秒级转换的纳米级覆盖区。在本文中，我们将数字电位计的频率特性与唯一的市售忆阻器进行比较。忆阻器寄生效应在较高频率下占主导地位，从而扩展了带宽。为了展示忆阻电路的优势，我们分析并实现了可调电路，例如分压器，反相放大器，高通滤波器和移相器。为此使用KnowM Inc.的市售忆阻器。通过测量获得的实验结果证明了忆阻器具有与数字电位计相同或更好的特性。分压器和反相放大器的忆阻实现具有更宽的带宽，