Download Wide-Bandwidth High Dynamic Range D/a Converters by Konstantinos Doris PDF

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By Konstantinos Doris

Wide-bandwidth excessive dynamic diversity electronic to Analog Converters (D/A) are crucial parts of contemporary platforms, e.g. multi-carrier verbal exchange structures. present steerage D/A converters supply the capability to accomplish excessive dynamic variety for large frequency bandwidths, even if, their functionality at greater frequencies is mostly constrained through powerful nonlinear habit. This habit isn't really good understood and impedes functionality growth.

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Example text

The additional capacitor C is held grounded. A total charge Q = Vre f C2N is deposited on the top plates. When the conversion starts all capacitors resume ground, or Vre f , dependent on their bits, while the additional capacitor is let free. The charge conservation law makes the stored charge in the top plate to re-distribute forcing a voltage voltage at the top plate which is a fraction of Vre f according to the code. The accuracy of SC DACs is limited by capacitor matching [17,18] and shares similarities with that of resistors: for a fixed relative capacitance spread, the averaging principle determines the impact on INL as a function of the number of elements of the converter.

The LSB current source consists of a MOS current source in a cascode configuration. Both are biased at constant voltages. To build the current sources of the other bits, the LSB transistors are sized up according to the bit weight and are biased by the same bias voltages. The switches are made by differential pairs, and their sizes are scaled up according to the bit values as well. In practice, partitioning is applied to the weighted sources and each weighted current source (or cascodes, or switches) is made of a number of LSB devices connected in parallel (the LSB device becomes the unit device).

MTs (m+1)Ts time Chapter 2 Frame work for Analysis and Synthesis of DACs 22 a data-dependent way, then for a sinusoidal signal the errors are harmonically related to it, whereas if the deformations are random, then the results are noise and distortion dependent on the correlation with the input signal. From chapter 1, in eq. 1) timing which says that 1. the amplitude of the signal is determined by z(m), 2. the time difference between successive sample transitions equals Ts , 3. the shape of the pulse h(t) is identical for every code to code transition.

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