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APN5001: Theory and Application of Sampling Phase Detector
APN5001: Theory and Application of Sampling Phase Detector

... directional coupler. This results in a 2 dBm microwave signal to the sampling phase detector. This will generate a beat note of 400 mV peak-to-peak output. The loop amplifier used is a second-order loop (Figure 4a), and the phase noise loop bandwidth was set at 300 kHz. A wide loop bandwidth will be ...
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MC13020 Motorola C-QUAM® AM Stereo Decoder
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Document
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... conversion efficiency is improved. The asymmetrical control scheme can be also extended to the stacked structure for high input voltage applications. Finally, two LLC converter prototypes both with 200-kHz resonant frequency for asymmetrical and symmetrical control schemes are built and compared to ...
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Slide 1

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INCREASE OF STRAIN GAGE OUTPUT VOLTAGE SIGNALS ACCURACY
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Heterodyne



Heterodyning is a radio signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden, in which new frequencies are created by combining or mixing two frequencies. Heterodyning is used to shift one frequency range into another, new one, and is also involved in the processes of modulation and demodulation. The two frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer. In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum f1 + f2 of the two frequencies, and the other at the difference f1 − f2. These new frequencies are called heterodynes. Typically only one of the new frequencies is desired, and the other signal is filtered out of the output of the mixer. Heterodynes are related to the phenomenon of ""beats"" in acoustics.A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.
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