By U. Meyer-Baese
Bargains an outline of FPGA expertise, units, and instruments to layout state-of-the-art DSP structures. The accompanying CD-ROM comprises the examples in VHDL and VERILOG code in addition to the latest Altera Baseline software program. CD-ROM integrated.
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Extra resources for Digital Signal Processing with FPGA
Another possible implementation is that the counter counts till P is reached and is reset. The division ratio then equals P. If the input frequency to the divider is too high for digital programmable counters, prescalers are used. A prescaler divides by a fixed number, omitting the delay problems of the programmable counter. In fact, the prescaler pre-scales the input frequency for the subsequent programmable counter stages. The main disadvantage of fixed prescaler is that for a given frequency resolution, the reference frequency needs to be lowered.
A. GSM-1800, is a digital cellular communication system, using digital information coding and digital control. Handsets, further referred to as mobile stations (MS), roam throughout a honeycomb cell pattern, constantly keeping touch with the base transceiver station (BTS) in the center of the current cell. In what follows, only the part of the total DCS-1800 protocol that determines the specifications of the RF analog front-end of the MS is touched upon. Basically, DCS-1800 is the high frequency sibling of the well known Global System for Mobile communications at 900 MHz (GSM-900).
The phase of the output signal is actually locked to the phase of the input signal hence a phase-locked loop. A phase-locked loop consists of three (or optionally four) basic components (Fig. 1): a phase detector (PD), a loop filter, a voltage controlled oscillator (VCO) and optionally a frequency divider. The phase detector compares the phase of the input signal against the phase (or the divided phase) of the VCO. The output of the phase detector is a measure of the phase difference between the two inputs.