Continuous-Time ADC With VCO-Based Integrator and Quantizer Implemented in 0.13 m CMOS

A 0.13[mu]m CMOS 78dB SNDR 87mW 20MHz BW CT [Delta Sigma] ADC with VCO-based integrator and quantizer

A 12-Bit, 10-MHz Bandwidth, Continuous-Time Sigma-Delta ADC with a 5-Bit, 950-MS/s VCO-Based Quantizer

The use of VCO-based quantization within continuous-time (CT) analog-to-digital converter (ADC) structures is explored, with a custom prototype in 0.13 m CMOS showing measured performance of 86/72 dB SNR/SNDR with 10 MHz bandwidth while consuming 40 mW from a 1.2 V supply and occupying an active area of 640 m 660 m. A key element of the ADC structure is a 5-bit VCO-based quantizer clocked at 95...

Vco-Based continuous-Time Sigma Delta ADC Based on a Dual-VCO-quantizer-Loop Structure

This paper explores a continuous time (CT) sigma delta ( ) analog-to-digital converter (ADC) based on a dual-voltage-controlled oscillator (VCO)-quantizer-loop structure. A thirdorder ̄lter is adopted to reduce quantization noise and VCO nonlinearity. Even-order harmonics of VCO are signi ̄cantly reduced by the proposed dual-VCO-quantizer-loop structure. The prototype with 10MHz bandwidth and 400...

A 174.3dB FoM VCO-based CT ΔΣ modulator with a fully digital phase extended quantizer and tri-level resistor DAC in 130nm CMOS

This paper presents a high dynamic range (DR), power efficient VCO-based continuous time ΔΣ modulator (CTDSM). It introduces a simple, robust and low power fully digital phase extended quantizer (PEQ) that doubles the VCO quantizer resolution compared to conventional XOR-based phase detector with minimum overhead. A tri-level resistor DAC is also introduced as complementary to the new quantizer...

A 0.13µm CMOS 78dB SNDR 87mW 20MHz BW CT ΔΣ ADC with VCO-based integrator and quantizer

Voltage-controlled oscillator (VCO) based ADCs have become a topic of great interest due to the unique and attractive signal-processing properties they offer in the design of oversampling converters. Assuming a ring-oscillator structure, the outputs of a VCO toggle between two discrete levels (VDD and GND) like a CMOS digital gate, enabling simple multibit quantization using Dflip-flops. Since ...