| 摘要 |
A waveform shaping method comprises: (a) receiving link-distorted signal pulses; (b) passing the link-distorted signal pulses through a series of differential amplifiers each have independently tunable, base gains, peak boost gains, boost frequencies and boost bandwidths; and (c) adjusting one or more of the base gains, peak boost gains, boost frequencies and boost bandwidths of the series of differential amplifiers so as to realize a selective and progressive waveform re-shaping of the link-distorted signal pulses. In one embodiment, each amplifier in the series has first and second transistors with respective first and second drain nodes through which sum-constant currents respectively flow; and first and second, variable drain impedances (Zd 1, Zd 2 ) coupled to the first and second drain nodes, where each of the variable drain impedances has a non-negligible inductance (L), a non-negligible capacitance (C) and a non-negligible resistance (R), and where at least two of the R, L and C factors are programmably and independently adjustable so that an input voltage versus output voltage transfer function of the differential amplifier can exhibit a peak gain at a corresponding peak boost frequency which is greater than a base gain of the differential amplifier at 0 Hz.
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