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A variable-gain current-amplifier-based feedback transimpedance amplifier (CA-TIA) with a gain-insensitive bandwidth is analyzed and designed for gigabit-per-second optical wireless communications. Implemented in 0.18-μm CMOS, as the transimpedance gain varies from 55.8 to 69.3dBΩ, the 3-dB bandwidth of the CA-TIA remains relatively invariable around 1 GHz.
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Chen et al. (2015) studied this question.
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