This paper discusses ongoing experimental research involving the design of novel architectures applicable to high-speed regenerated data transmission systems. A novel GaAs transimpedance amplifier is described. The design uses a common-source configuration combined with a parallel feedback providing low input current noise, high transimpedance and wide dynamic range. PSPICE simulations using 0.6 pm GaAs process give 1.097 GHz bandwidth, 87 dB transimpedance gain, 2.7pA/[Hz]"* average equivalent input noise current spectral density and 35 mW power consumption.
Classical designs of transimpedance preampl8ers for optical receivers circuits use common-emitter (C-E) or common-source (C-S) input stages. The use of current-mode techniques to design photoreceivers for optical communication systems has been shown to offer signiJcant bandwidth advantages over traditional voltage-mode designs [IO]. In this papeq we focus on the design of a wkieband, low-noise photoreceiver in GaAs using current-based amplibing techniques. A 3 dB bandwidth exceeding 3.5 GHz and, 48 dB of gain, along with I2pA/mzinput noise have been simulated with a
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