EAN: 9783031797606

SYNTHESIS LECTURES ON DIGITAL CIRCUITS & SYSTEM...

In PSpice for Analog Communications Engineering we simulate the difficult principles of analog
modulation using the superb free simulation software Cadence Orcad PSpice V10.5. While use is
made of analog behavioral model parts (ABM)  we use actual circuitry in most of the simulation
circuits. For example  we use the 4-quadrant multiplier IC AD633 as a modulator and import real
speech as the modulating source and look at the trapezoidal method for measuring the modulation
index. Modulation is the process of relocating signals to different parts of the radio
frequency spectrum by modifying certain parameters of the carrier in accordance with the
modulating information signals. In amplitude modulation  the modulating source changes the
carrier amplitude  but in frequency modulation it causes the carrier frequency to change (and
in phase modulation it's the carrier phase). The digital equivalent of these modulation
techniques are examined in PSpice for Digital communications Engineering where we examine QAM 
FSK  PSK and variants. We examine a range of oscillators and plot Nyquist diagrams showing
themarginal stability of these systems. The superhetrodyne principle  the backbone of modern
receivers is simulated using discrete components followed by simulating complete AM and FM
receivers. In this exercise we examine the problems ofmatching individual stages and the use of
double-tuned RF circuits to accommodate the large FM signal bandwidth.

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