This work demonstrates a Continuous-Time (CT) Ladder filter using transconductance amplifiers as an approximate delay stage implemented on a large-scale Field Programmable Analog Array (FPAA) and characterized on an SoC FPAA. We experimentally demonstrate a reprogrammable CT Analog linear-phase filter by utilizing the ladder filter delay element and Vector-Matrix Multiplication (VMM) both compiled on the SoC FPAA. Using the Ladder Filter as a programmable CT delay operation enables a traditionally difficult analog signal operation. This effort extensively models and characterizes the ladder filter delay stage in terms of its transfer function, delay tunability, power requirements, distortion, and SNR. The theoretical development is compared to experimental measurements on an SoC FPAA with programmable ladder filter delay of $2.9\mu \text{s}$ and $4.2\mu \text{s}$ for multiple input frequencies (e.g. 5kHz, 20kHz). In addition, we show that VMMs can compensate the non-idealities found in the ladder filter delay-line operation.

中文翻译：

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基于 SoC FPAA 的可编程、基于梯形滤波器的线性相位模拟滤波器

这项工作展示了使用跨导放大器作为近似延迟级的连续时间 (CT) 梯形滤波器，该滤波器在大规模现场可编程模拟阵列 (FPAA) 上实现并在 SoC FPAA 上进行表征。我们通过利用在 SoC FPAA 上编译的梯形滤波器延迟元件和矢量矩阵乘法 (VMM)，通过实验演示了可重新编程的 CT 模拟线性相位滤波器。使用梯形滤波器作为可编程 CT 延迟操作可以实现传统上困难的模拟信号操作。这项工作根据传递函数、延迟可调性、功率要求、失真和 SNR 对梯形滤波器延迟级进行了广泛的建模和表征。将理论发展与具有可编程梯形滤波器延迟的 SoC FPAA 的实验测量进行比较 $2.9\mu\text{s}$ 和 $4.2\mu\text{s}$ 用于多个输入频率（例如 5kHz、20kHz）。此外，我们表明 VMM 可以补偿梯形滤波器延迟线操作中发现的非理想情况。