2023年7月16日 · The center frequency of the VCO is critical for good DPLL performance when using the XOR gate with RC loop filter. If the center frequency, fcenter , of the VCO (i.e., VinVCO = VDD/2) does not match twice the input data rate, the DPLL will lock up at a phase different from /2 (the input frequencies to any phase detector must be equal).

A PLL is a feedback system that includes a VCO, phase detector, and low pass filter within its loop. Its purpose is to force the VCO to replicate and track the frequency and phase at the input when in lock. The PLL is a control system allowing one oscillator to track with another. It is possible to have a phase offset between input and

A five stage XOR based VCO design shows frequency variation [1.049 - 0.565] GHz with power consumption variation from [493.989 - 31.753] µW. Simulations have been performed by using SPICE based on TSMC 0.18µm CMOS technology.

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 …

an XOR operation. The number of VCO delay cells that undergo a transition within a given clock period is a function of the delay through each stage as set by the Vtune voltage, which yields the quantized value of the voltage Vtune that we seek. Figure 2: Block diagram of the VCO-based quantizer’s behavioral model.

2023年7月16日 · The center frequency of the VCO is critical for good DPLL performance when using the XOR gate with RC loop filter. If the center frequency, fcenter , of the VCO (i.e., VinVCO = VDD/2) does not match twice the input data rate, the DPLL will lock up at a phase different from /2 (the input frequencies to any phase detector must be equal).

2010年1月24日 · A 5GHz Gated VCO for burst-mode operation in 10Gbps GPON and EPON systems is presented. The GVCO consists of four stages of XNOR/XOR cell with voltage-controlled delays, and aligns output clock to burst data within 2 bits time. The GVCO has a tuning range from 4.4GHz to 6.2GHz.

XOR phase and frequency detection with FF and XOR Automatic DWA for frequency detector output code-Must explicitly perform DWA on phase detector output code

Abstract: This article presents a high speed third-order continuous-time (CT) sigma-delta analog-to-digital converter (SDADC) based on voltage-controlled oscillator (VCO), featuring a digital programmable quantizer struc-ture.

Why Should We Consider VCO-Based Quantizers? 44 dB SNDR with 20 kHz BW. Measured SNR/SNDR Vs. Input Amplitude (20 MHz BW) SNDR? High SNDR requires higher order ...