Title :
A 70 dBohm 2.3 GHz low noise transimpedance amplifier
Author :
Yang Jiao ; Weimin Li ; Dianwei Zhang ; Wu Wen
Author_Institution :
Beijing Microelectron. Technol. Inst., Beijing, China
Abstract :
A low-noise transimpedance amplifier (TIA) for 2.5 Gb/s family is presented using 0.35 μm BiCMOS technology. It would be used in radiation detectors to transform the current pulse produced by a photo-sensitive device into an output voltage pulse with a specified amplitude and shape. In this paper the mathematical analysis of the proposed TIA is presented together with a detailed analytical noise optimization. For the gain boosting, Cherry-Hooper amplifier is introduced for the second stage amplification. Also a method for eliminating the DC current of the input photodiodes (PD) is proposed. The chip measured results show the TIA achieves a constant gain of 70 dBΩ from 125 kHz to 2.3 GHz when connected to a 0.85 pF load, average input referred noise of 2.13 pA/√Hz up to 0.8 GHz, 18 mA supply current at +3.3 V including the output buffer. The die size is 30mil×50mil.
Keywords :
BiCMOS integrated circuits; UHF amplifiers; operational amplifiers; particle detectors; BiCMOS technology; Cherry-Hooper amplifier; DC current; analytical noise optimization; bit rate 2.5 Gbit/s; capacitance 0.85 pF; current 18 mA; frequency 0.8 GHz; frequency 125 kHz; frequency 2.3 GHz; low noise transimpedance amplifier; mathematical analysis; photodiodes; photosensitive device; radiation detectors; second stage amplification; size 0.35 mum; voltage 3.3 V; Bandwidth; CMOS integrated circuits; Equations; Gain; Mathematical model; Noise; Radio frequency; Cherry-Hooper amplifier; DC cancellation circuit; Transimpedance amplifier; broadband amplifier;
Conference_Titel :
Consumer Electronics ?? Berlin (ICCE-Berlin), 2013. ICCEBerlin 2013. IEEE Third International Conference on
Conference_Location :
Berlin
Print_ISBN :
978-1-4799-1411-1
DOI :
10.1109/ICCE-Berlin.2013.6697985
