Figure 4–1 Communication system.

Figure 4–1 Communication system.
Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 4–2 Spectrum of AM signal.

Figure 4–3 Bandpass filtering.

Figure 4–4 Transfer characteristics of a distortionless bandpass channel.

TABLE 4–2 FILTER CONSTRUCTION TECHNIQUES

Figure 4–5 Nonlinear amplifier output-to-input characteristic.

Figure 4–6 Amplifier output characteristics.

Figure 4–7 Ideal limiter characteristic with illustrative input and unfiltered output waveforms.

Figure 4–8 Mixer followed by a filter for either up or down conversion.

Figure 4–9 Nonlinear device used as a mixer.

Figure 4–10 Linear time-varying device used as a mixer.

Figure 4–11 Analysis of a double-balanced mixer circuit.

Figure 4–12 Frequency multiplier.

Figure 4–13 Envelope detector.

Figure 4–14 Product detector.

Figure 4–15 Frequency demodulation using slope detection.

Figure 4–16 Slope detection using a single-tuned circuit for frequency-to amplitude conversion.

Figure 4–17 Balanced discriminator.

Figure 4–18 Balanced zero-crossing FM detector.

Figure 4–20 Some phase detector characteristics.

Figure 4–22 Linear model of the analog PLL.

Figure 4–23 PLL VCO control voltage for a swept sinusoidal input signal.

Figure 4–24 PLL used for coherent detection of AM.

Figure 4–25 PLL used in a frequency synthesizer.

Figure 4–26 Direct digital synthesis (DDS).

Figure 4–27 Generalized transmitter using the AM–PM generation technique.

Figure 4–28 Generalized transmitter using the quadrature generation technique.

Figure 4–29 Superheterodyne receiver.

Figure 4–30 Spectra of signals and transfer function of an RF amplifier in a superheterodyne receiver. Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 4–31 IQ (in-phase and quadrature-phase) detector.

Figure 4–32 Three methods for sampling bandpass signals.

Figure 4–1 Communication system.

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Figure 4–1 Communication system.

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