2023年9月8日 · 这篇文章具体比较和分析了开环和闭环结构的VCO-ADC，对其进行了建模并计算了STF和NTF。 从之前的文章中我们知道，对于开环的结构而言，不需要用来反馈的DAC，但是VCO的非线性导致精度非常垃圾，可能就得做一些修调。 在闭环结构中线性度会因为反馈而更好，但是需要考虑其他因素，比如 环路滤波器 的设计等。 对于差分的设计，还要考虑两个VCO的匹配。 这篇文章提出了只用一个VCO的闭环结构，所以不用考虑匹配问题。 上图展示了开环和 …

2018年6月1日 · We have shown how a high-resolution VCO-ADC can be modified to benefit from dynamic range extension through feedback without requiring a highly complex DAC. This architecture is based on the Leslie-Singh modulator principle but with the added benefit of an easy quantiser scalability by use of digital counters.

深亚微米下传统模拟电路占用大量面积以及产生较大功耗（VDD scaling，Mismatch， Noise），基于time encoding 的模拟电路应运而生，结合数字电路的模拟电路比起传统模拟电路而言具有更易缩小面积（数字电路喜闻乐见的红利）和获得更好性能的特点（数字抗噪高精度） Time-based 的原理？ 使用调制的方波来表示模拟信号，信号包含的信息记录在方波的边沿，脉冲长度或者频率上，而不是像传统的模拟信号一样使用电压或电流值等电学量来进行表示，这样 …

We will present a 18.5fJ/step discrete-time VCO-based 0-1 MASH ADC as well as a continuous-time, third-order purely VCO-based ADC architecture. We will also present applications of our ADCs for sensing, such as capacitance-to-digital conversion and current-to-digital conver-sion. ADCs are widely used for applications requiring high resolution.

LMX2571 是Texas Instruments公司最新推出的针对DMR 数字对讲机市场的射频锁相环芯片,该芯片内部集成VCO,同时支持外部VCO ,支持输出频率在内部VCO 和外部VCO之间切换并快速锁定,利用这个独特的功能满足双时隙通信对锁定时间的快速要求。 DMR 数字对讲机帧结构和双时隙通信的设计难点............................................................................... 2.

ADCs implemented with VCOs are an interesting choice to implement oversampled ADCs in low-voltage nanometre CMOS technologies. In addition of a mostly digital circuitry, VCO-ADCs con-structed with ring oscillators may be designed with very low input-referred thermal noise [1] and icker noise mitigation techniques fl [2].

I found some FM transmitter circuits with the MAX2606 VCO. Example: Can I replace R1 with the DAC output from an AVR microcontroller? Or can I connect the DAC directly to Pin 3 of the MAX2606?

A standalone component threshold inverter quantizer (TIQ) is proposed to sample, discretize and convert the continuous-time signal from the voltage-controlled oscillator (VCO) to a digital domain...

本文基于65nm CMOS工艺，研究设计了一款基于VCO的高度数字化Sigma-Delta ADC。 在系统设计方面，采用基于VCO的Sigma-Delta ADC结构实现二阶噪声整形，其控制架构为改进的ADPLL结构。

VCO-based integrator and quantizer-Proposed voltage-to-phase conversion to avoid - distortion from Kv non- linearity Achieved 78 dB SNDR in 20 MHz BW with 87 mW power Key performance bottleneck: transient DAC mismatch 50