Abstract
This paper describes and analyzes a low noise and high bandwidth transimpedance amplifier featuring a large dynamic range. The designed amplifier is configured on three identical stages that use an active load compensated by an active resistor to improve the stability performance of the amplifier. This topology displays a transimpedance gain of 150k/spl Omega/, which is necessary to obtain a high sensitivity. This structure operates at 5V power supply voltage, exhibits a gain bandwidth product of 18THz/spl Omega/ and a low noise level of about 0,94pA//spl radic/Hz. This transimpedance amplifier can achieve a transmission speed of 240Mb/s for a photocurrent of 0.5/spl mu/A. A transmission speed of 622 Mb/s can be achieved by using a connection with optical fiber containing four channels and this for a photocurrent of 9,5/spl mu/A. The predicted performances are verified by simulations using PSPICE tool with 0.8 /spl mu/m CMOS AMS parameters.
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