Patent
Modulation amplification system
Hitoshi Matsui,仁志 松井 +1 more
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TLDR
In this paper, a power amplifier which has amplitude distortion is used to amplify an amplitude-modulating signal without distortion by converting an inputted digital signal into plural phase modulating signals, and amplifying and adding the respective output signals together.Abstract:
PURPOSE: To amplify an amplitude-modulating signal without distortion by using a power amplifier which has amplitude distortion by converting an inputted digital signal into plural phase-modulating signals, and amplifying and adding the respective output signals together. CONSTITUTION: The 4-bit digital signal inputted from an input terminal 100 is converted by a modulating signal generator 110 into the four phase signals. Respective modulators 120-123 impose phase modulation on the basis of the signals outputted by the modulating signal generator 110. Even when input/ output characteristics of the amplifier 130 are nonlinear, the input signal to the amplifier 130 shifts only in phase and is constant in amplitude, so distortion originating from the nonlinear characteristics never appears. Further, the phase modulation is imposed by the modulators 120-123, so the frequency spectrum of a modulated signal is wider than the frequency spectrum of an input signal, but the phase shift by the modulation is <=±45 deg., so the spread of the spectrum can nearly be ignored and then nearly the same frequency characteristics with linear modulation can be obtained.read more
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References
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TL;DR: In this paper, a 2-phase phase shift keying (PSK) transmitter with C-class non-linear amplifier as the amplifier was proposed to obtain a narrow occupied band width and high-efficiency large output.
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