| 초록 |
In this paper, a dual-channel feed-forward transimpedance(TIA) array is realized in a standard $0.18-{ mu}m$ CMOS technology which exploits automatic gain control function to provide 40-dB input dynamic range for either detecting targets nearby or sensing imminent danger situations. Compared to the previously reported conventional feed-forward TIA, the proposed automatic-gain-control feed-forward TIA(AFF-TIA) extends the input dynamic range 25 dB wider by employing a 4-level automatic gain control circuit. Measured results demonstrate the linearly varying transimpedance gain of 47 to $72dB{ Omega}$ , input dynamic range of 1:100, the bandwidth of $${ geq_-}670MHz$$ , the equivalent input referred noise current spectral density of 6.9 pA/ ${ surd}$ HZ, the maximum sensitivity of -26.8 dBm for $10^{-12}BER$ , and the power consumption of 27.6 mW from a single 1.8-V supply. The dual-channel chip occupies the area of $1.0{ times}0.73mm^2$ including I/O pads. |
