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 150 kΩ, which is necessary to obtain a high sensitivity. This structure operates at 5 V power supply voltage, exhibits a gain bandwidth product of 18 THzΩ and a low-noise level of about [Formula: see text]. This transimpedance amplifier can reach a transmission speed of 240 Mb/s for a photocurrent of 0.5 μA. For a photocurrent of 9.5 μA, a transmission speed of 622 Mb/s can be achieved by using an optical fiber connection containing four channels. The predicted performance is verified by simulations using PSPICE and MAGIC tools with 0.8 μm CMOS AMS parameters.
This article describes and analyses a low power and high speed comparator. The designed comparator is intended to be implemented in a 10 bit 20 MHz Pipeline Analogue-to-Digital Converter dedicated to RF Wireless Local Area Network (WLAN) applications. This comparator is based on the switched capacitor network using a two-phase non-overlapping clock. The offset voltage of the designed comparator has been reduced by means of an active positive feedback. The analyses and simulation results which have been obtained using 0.8 mm CMOS AMS process parameters, with a power supply voltage of 5 V and an input common mode of 2-3 V, show that this comparator exhibits a propagation delay of 17.3 ns, an offset voltage of about 77.3 mV, a good accuracy and a low power consumption of about 0.8 mW. The predicted performance is verified by analyses and simulations using PSPICE tool.
Ahslvacl-This paper describts 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 ofthe amplifier. This iopology displays a transimpedance gain of 1 5 O k n , which is nccessaiy to obtain a high sensitivity This Structure operates at SV power supply voltage, exhibits a gain bandwidth product of I8THz.Q and a low noise level of about 0.94pA/&. This transimpedance amplifier can achieve a transmission speed of 240Mbls for a photocurrent of 0,5M . A transmission speed of 622 Mb/s can be achieved by using a connection with optical fiber containing four channels and this for a photocurent of 9.51~4 . The predicted performances are verified by simulations using PSPICE tool with 0.8pm CMOS AMS parameters.
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