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Title
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مقاله چاپ شده با عنوان A Modified Regulated Cascode transimpedance amplifier
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Type
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JournalPaper
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Keywords
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Transimpedance Amplifier, Regulated Cascode, high-gain, bandwidth extension, NIRS.
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Abstract
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This paper presents a Transimpedance Amplifier (TIA) for high sensitivity Near Infrared Spectroscopy (NIRS). The proposed TIA is based on the Regulated Cascode (RGC) structure with an extra transistor employed to implement additional feed-forward path and achieve higher gain values. The extra transistor senses a partially amplified input signal, available in the conventional circuit, and conveys an additional ac current into the load, which provides a higher gain. In addition, a bandwidth extension method is introduced using a capacitor and resistor, which can improve amplifier’s bandwidth by 40%. The proposed TIA is designed in 0.18μm CMOS technology and achieves a transimpedance gain of 101.9dB with a -3dB bandwidth of 91.2 MHz considering 2pF of photodiode capacitance at the TIA input. The input referred noise is 4.4pA/√Hz while dissipating 151μW power.
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Researchers
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maryam zare (Second Researcher), zahra sohrabi (First Researcher)
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