Abstract
AbstractAnalog basic amplifier ICs (e.g., differential amplifiers, parallel feedback amplifiers, gain control amplifiers) and equalizing amplifier ICs for repeater circuits of high‐capacity optical transmission systems are designed using high‐speed bipolar technology (e.g., SST‐2). Particular consideration is given to reduction of base resistance, optimization of current density and pattern layout and improving breakdown voltage in applying this technology to analog circuits. Moreover, a peaking technique is applied to wideband amplifiers and a gain control amplifier is constructed which has wide linearity and can be directly connected to other differential circuits because of its constant dc level. For a differential amplifier with peaking, a gain of 15 dB and bandwidth of 1.4 GHz are realized. Expansion of bandwidth by peaking is also applied for the gain control amplifier and a gain of 28 dB, bandwidth of 630 MHz and a variable gain range of 30 dB are obtained. In addition, an equalizing amplifier with transimpedance of 70 ∼ 620 dB and bandwidth of 410 ∼ 620 MHz is constructed. Thus, it is evident that integrated repeater circuits for use in high‐capacity optical transmission systems can be realized.
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