By Dag Stranneby and William Walker (Auth.)
, Pages ix-x
1 - Introduction
, Pages 1-39
2 - The analog—digital interface
, Pages 41-71
3 - Adaptive electronic systems
, Pages 73-93
4 - Non-linear applications
, Pages 95-130
5 - Spectral research and modulation
, Pages 131-158
6 - advent to Kalman filters
, Pages 159-177
7 - facts compression
, Pages 179-207
8 - Error-correcting codes
, Pages 209-239
9 - electronic sign processors
, Pages 241-277
Appendix 1 - strategies to problems
, Pages 279-312
Appendix 2 - A MATLAB™/Simulink™ primer
, Pages 313-340
, Pages 341-343
, Pages 345-349
, Pages 351-357
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Extra resources for Digital Signal Processing and Applications
Another problem with real world DACs is that during the transition from one sample value to another, glitches, ringing and other types of interference may occur. To counteract this, a sample-and-hold device (S&H or S/H) is used. The most common type is the zero-order hold (ZOH) presented in Chapter 1. This device keeps the output constant until the DAC has settled on the next sample value. Hence, the output of the S/H is a staircase waveform approximation of The analog-digital interface 57 the sampled analog signal.
Further, if we calculate the total resistance of the circuit R5-R6 in parallel with R7-R8, we will find it to be R. If we now move to point p\ we will have a similar situation as inj^o. The total resistance of R5, R6, R7 and R8 is R. This combination is connected in series with RIO having resistance R ohms, hence the total resistance in the circuit passing through RIO to ground will be 2R. Since the total resistance through R3-R4 is also 2R, the current flowing through resistor R9 will be divided equally in the two branches as in the earlier case.
All poles have to be placed inside the unit circle for stability reasons; the location of zeros does not matter from a stability point of view. e. a given frequency, is inversely proportional to the gain. The closer a pole is located to the unit circle, the higher the gain for frequencies in vicinity of the pole. A pole should preferably not be placed on the unit circle, since that will create an oscillator, or in the worst case, lead to instabilities due to numerical truncation effects. e. a given frequency, is proportional to the gain.