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TGA2512 数据资料DataSheet下载
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... typical P1dB, while in gate-biased mode the typical P1dB is over 13dBm. The small size of 2.46mm2 allows ease of compaction into MultiChip-Modules (MCMs). The TGA2512 is 100% DC and RF tested onwafer to ensure performance compliance. ...
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... stringent requirements are posted on mixer performance. The Gilbert cell mixers have presented excellent properties and achieved wide applications. However, the noise of a conventional active Gilbert cell mixer is high. This thesis demonstrates both passive and active mixing circuits with improved n ...
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... The pattern for Threshold 2 is the same as the pattern of PPG2 generating the maximum amplitude at PAM generation. And the PPG1 pattern appears half in Threshold 1 and half in Threshold 3. The shaded blue parts in the waveform diagram are the PPG1 pattern. The PPG1 pattern appears at Threshold 3 whe ...
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... Abstract: Conventional contact-based train power transfer systems have high maintenance costs and safety issues and cause noise and additional aerodynamic drag. Instead of the conventional system, a loosely coupled online wireless power transfer (WPT) system for a train is proposed in this paper. Th ...
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... When a low frequency PWM signal with voltages between 2.5V and a low level of zero is applied to the CTRL pin the output current will be switched on and off at the PWM frequency. The resultant LED current ILEDavg will be proportional to the PWM duty cycle. See figure 18. A Pulse Width Modulated (PWM ...
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... sought-after vintage micpre noise levels are much worse than the RNPs, so in actual use, I concluded that many folks (particularly those “in-the-know”), when a choice must be made, prefer tone to low-noise. Second, even though we have internal versions of the RNP with a “competitive” EIN, we’d have ...
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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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