Bandpass Analog-to-digital Conversion for Wireless Applications
نویسندگان
چکیده
............................................................................................................................ iii Acknowledgments............................................................................................................... v List of Tables .................................................................................................................. xiii List of Figures ................................................................................................................... xv Chapter
منابع مشابه
Direct Digital-to-RF Conversion for Mobile-Phone Basestation Applications using Bandpass Sigma Delta Modulation
Sigma-delta modulator based digital-to-analog converters (DAC) have offered low-frequency designers a highly linear, high resolution data converter architecture that is highly amenable to integration with complex digital systems. Increasingly these data converters have been used to deliver all the power needed. In wireless applications, it is increasingly desirable to apply low-frequency sigma-...
متن کاملA Noise-Shaping Algorithm of Multi-bit DAC Nonlinearities in Complex Bandpass ∆ΣAD Modulators
This paper presents a technique for improving the SNR and resolution of complex bandpass ∆ΣADCs which are used for wireless communication systems such as cellular phone, wireless LAN and Bluetooth. Oversampling and noise-shaping are used to achieve high accuracy of a ∆ΣAD modulator. However when a multi-bit internal DAC is used inside a modulator, nonlinearities of the DAC are not noise-shaped ...
متن کاملImproving adaptive resolution of analog to digital converters using least squares mean method
This paper presents an adaptive digital resolution improvement method for extrapolating and recursive analog-to-digital converters (ADCs). The presented adaptively enhanced ADC (AE-ADC) digitally estimates the digital equivalent of the input signal by utilizing an adaptive digital filter (ADF). The least mean squares (LMS) algorithm also determines the coefficients of the ADF block. In this sch...
متن کاملA 4th-order Bandpass Sigma-delta Modulator
Digital radio receivers must perform the analog-to-digital conversion of bandpass signals. For signals with small relative bandwidths, bandpass XA analog-to-digi ta l converters offer high signal-to-noise ratios at significantly lower sampling rates than are required for lowpass ZA converters, while still providing excellent linearity. A 4thorder bandpass ZA modulator implemented in a 3 pm CMOS...
متن کاملApplications of Polyphase Filters for Bandpass Sigma-delta Analog-to-digital Conversion
The traditional lowpass Sigma-Delta (Σ∆) based Analog-to-Digital (A/D) conversion principle has been recently extended to bandpass for direct IF conversion. Such converter offers high Signal-to-Noise (SNR) ratios for narrowband signals relative to the sampling frequency, at significantly lower oversampling ratios in comparison to the conventional lowpass Σ∆ converters. In this paper a sixth-ord...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998