The Linearization of Two Multichannel Amplifiers Connected in Cascade by Using the Second Harmonics and Fourth-Order Nonlinear Signals

Males-Ilic, Natasa; Randelovic, J.

doi:10.1109/telsks.2005.1572134

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…10(a). 24,25) As shown in Fig. 10(b), the envelope detector, which was adjusted so that its time constant was at 2.35 ms converted the receiving signal to the envelope signal.…”

Section: Evaluation Of the Vibration Communicationmentioning

confidence: 99%

Vibrational communication system in ultrasonic frequency band

Takasawa¹,

Nagasawa²

2020

Jpn. J. Appl. Phys.

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Vibrational communication is a suitable method for exchanging important personal information between information technology devices. Since the vibration propagates only through the vibration medium, the information signal is spatially limited, and it prevents any eavesdropping. However, it has proven slow and unreliable. Therefore, we proposed a vibrational communication method using the ultrasonic band. The characteristics of the vibration propagation were measured using piezoelectric elements as the transmitter and receiver and plastic toy blocks as a vibration medium. We performed a successful demonstration of the vibrational communication using a time period per bit of 2 ms, achieving a bit rate of 500 bps. To eliminate unpleasant noise and vibration sensations, a micro-electro-mechanical system (MEMS) resonant device using a higher frequency band was designed and used to simulate its frequency characteristics. Subsequently, the MEMS device was fabricated and a vibrational communication using the MEMS device successfully achieved a bit rate of 4 kbps.

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“…10(a). 24,25) As shown in Fig. 10(b), the envelope detector, which was adjusted so that its time constant was at 2.35 ms converted the receiving signal to the envelope signal.…”

Section: Evaluation Of the Vibration Communicationmentioning

confidence: 99%

Vibrational communication system in ultrasonic frequency band

Takasawa¹,

Nagasawa²

2020

Jpn. J. Appl. Phys.

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“…Among a few ways to minimize the memory effect, injection of harmonic signal is a good solution, which cuts off the harmonic interaction process eventually minimizing the phenomenon. However, so far the harmonic injection have been used for the cancellation of IMDs in power amplifiers (PAs) [2,3], and thereby most research efforts were focused on the reduction of the second or the third order IMDs only. Also, the cancellation of the IMD components were achieved based on the empirical measurements, and thus little estimation of amplitude and phase of the injection were made which is critical for precise digital predistortion techniques.…”

Section: Introductionmentioning

confidence: 99%

Analysis on high-order intermodulation of frequency multipliers with harmonic injection

Park

Son

2008

IEICE Electron. Express

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Abstract:For the successful transmission of complex signals through frequency multipliers, high order analysis of IMD responses for a frequency tripler is performed and the optimum solutions for the harmonic injection technique is presented to suppress the high order IMDs in the 3 rd zone. From the 7 th order analysis, optimum injection was found to suppress IMDs in the 3 rd harmonic zone and their optimum phases are shown to be apart by 180 degrees due to the even-ordered Volterra products of the injection. The measurement results showed IMD suppression better than 30 dB, which is consistent with the analysis and the simulated results.

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The Linearization of Two Multichannel Amplifiers Connected in Cascade by Using the Second Harmonics and Fourth-Order Nonlinear Signals

Cited by 2 publications

References 4 publications

Vibrational communication system in ultrasonic frequency band

Vibrational communication system in ultrasonic frequency band

Analysis on high-order intermodulation of frequency multipliers with harmonic injection

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