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[In conventional analog-to-digital converters (ADCs), the input voltage signal is sampled and quantized in the voltage domain using an analog processing chain. Voltage-controlled oscillator (VCO)-based ADCs differ from traditional ADCs since the analog input voltage is first converted to timing...
[In this chapter a detailed analysis on the operation and architecture of the voltage-controlled oscillator (VCO)-based ADC is presented. The VCO-based quantizer is analyzed for two different architectures, one using a frequency-to-digital converter (FDC) the other a time-to-digital converter...
[In the following sections, both quantizers are compared in the presence of circuit nonidealities such as VCO nonlinearity, phase noise, and sampling clock jitter. These nonidealities are added to the VerilogA model, and theoretical equations are derived to verify the effects on each quantizer....
[The following sections provide some final thoughts and analysis of the FDC and TDC VCO-based quantizer, such as the circuit requirements for each quantizer and performance of the quantizers, given a two-tone test.]
[In summary, this document presented an analytical and modeling approach to understanding the VCO-based quantizer. The VCO-based quantizer architecture consists of a VCO and digital time quantizer to quantize the VCO output signal. Two digital time quantizers were modeled and analyzed; one...
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