By Bupesh Pandita
ISBN-10: 1461402743
ISBN-13: 9781461402749
This e-book describes concepts for designing advanced, discrete-time ΔΣ ADCs with signal-transfer capabilities that considerably clear out interfering signs. The ebook presents an knowing of idea, matters, and implementation of discrete complicated ΔΣ ADCs. The recommendations built in each one bankruptcy are extra defined by way of employing them to a goal program of ΔΣ ADCs in DTV receivers.
- Focuses on complicated ΔΣ ADCs and methods for his or her implementation;
- Describes recommendations to relieve difficulties in implementation, akin to snapshot rejection deterioration as a result of mismatches;
- Discusses benefits of filtering STFs and describes an structure for his or her implementation;
- Includes Matlab, Simulink, and Mathematica code utilized in layout and behavioral simulations for layout and implementation of complicated ΔΣ ADCs.
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Extra resources for Oversampling A/D Converters with Improved Signal Transfer Functions
Example text
0 and terminate on the zeros, ozi, for L ! 1 (Fig. 6). What this movement means is that, at increasing values of stopband attenuation, the zeros of H(s) move from the stop-band into the passband region. This movement 3 A Complex DS Modulator with an Improved STF 42 2 z-plane L→ 0 1 L→ 0 Imaginary axis Unit circle L→ ∞ 0 −1 −2 −2 L→ 0 L→ 0 −1 0 Real axis 1 2 Fig. 8) as the filter attenuation, L, varies of zeros of H(s) into the passband can cause partial or full cancellation of the zeros of the NTF and result in degradation of the NTF SNR at increasing values of the stop-band attenuation.
The two real-part transfer functions may not be equal, and the same variation may be true for the two instances of the imaginary-part transfer functions. In [2] and [3], it has been shown that the transfer function of the mismatched complex filter can be written as a nominal term, a common-mode error term, and a differential-error term; refer to Fig. 4. 9) The term DAcm represents a common-mode variation of AR1 and AR2 , and similarly DAdiff is the differential variation in AR1 and AR2 . 9), is that it causes conjugation of the imageband and the desired signal-band.
A. Jantzi, K. S. Sedra, “Quadrature bandpass DS modulation for digital radio,” IEEE J. Solid-State Circuits, vol. 32, pp. 1935–1949, Dec. 1997. 6. J. J. Steyaert, ‘‘Low-IF topologies for high-performance analog front ends of fully integrated receivers,” IEEE Trans. Circuits Syst. -II: Analog and Digital Signal Processing, vol. 45, no. 3, pp. 269–282, March 1998. References 33 7. M. Hajirostam, K. Martin, ‘‘On-chip broadband tuner design for cable modem and digital CATV,” 48th Midwest Symposium on Circuits and Systems, vol.
Oversampling A/D Converters with Improved Signal Transfer Functions by Bupesh Pandita
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