New PDF release: VCO-Based Quantizers Using Frequency-to-Digital and

By Samantha Yoder

ISBN-10: 1441997210

ISBN-13: 9781441997210

This e-book introduces the idea that of voltage-controlled-oscillator (V.C.O.)-based analog-to-digital converters (A.D.C.s). unique clarification is given of this promising new category of excessive answer and occasional energy A.D.C.s, which use time quantization instead of conventional analog-based (i.e. voltage) A.D.C.s.

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Extra info for VCO-Based Quantizers Using Frequency-to-Digital and Time-to-Digital Converters

Example text

1 Linear Modeling and Analysis The TDC VCO-based quantizer is modeled and analyzed using linear modeling to determine the resolution. As stated before, the TDC measures the period of the VCO and is inverted to get the VCO frequency. The detected pulse using the relationship shown in Fig. 18), including multiple TDCs. 18) The period of the VCO is divided by two since only the positive going pulse is detected, and it is quantized in terms of the buffer delay, tbuff, with quantization noise, q(n).

This becomes important when the VCO-ADC is used in a DS modulator. S. 1007/978-1-4419-9722-7_4, # Springer Science+Business Media, LLC 2011 51 52 4 Further Analyses: FDC vs. 1 FDC/TDC circuit requirements Restrictions FDC fs ! 2 Â VCOfmax fs, sampling frequency VCO frequency fc ¼ fs/4 VCO SNR tuning knobs Ring VCO for MB operation "( fs, N, Kv) TDC fs ! 2 Â fb VCOTmax 1:5 Â Total delay VCOTmin ! tbuff Any "( fs, N, Kv) #(tbuff, fc) The circuit requirements for the TDC are as follows: the sampling frequency must be 2Â the input frequency to the VCO.

25) Following Fig. 26). 2 VCO Phase Noise 41 Fig. 27). 28). 28) and Fig. 22). The jitter filter is shown in Fig. 11. This filter is applied to the white noise jitter model and shown below. 23e6,1}); // End VerilogA code adjustment: VCO phase noise filter Using the new model, the VCO is simulated using the same value for sigma. The modeled VCO phase noise is plotted against the simulated SpectreRF VCO phase noise and closely matches, Fig. 12. 23) will be inserted into the previously derived output equations.

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VCO-Based Quantizers Using Frequency-to-Digital and Time-to-Digital Converters by Samantha Yoder

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