Title :
Transimpedance amplifier for very high sensitivity current detection over 5MHz bandwidth
Author :
Ferrari, Giorgio ; Gozzini, Fabio ; Sampietro, Marco
Author_Institution :
Dipt. di Elettron. e Inf., Politec. di Milano, Milan
fDate :
June 22 2008-April 25 2008
Abstract :
The paper presents a transimpedance amplifier made on standard 0.35 mum CMOS technology specifically conceived to measure the impedance of low-conductivity nano-bio devices. The circuit combines a bandwidth of 5 MHz with an extremely low noise of 3 fA/sqrt (Hz) by using an integrator-differentiator scheme. An innovative feedback network continuously discharges the integrator capacitance to ensure an unlimited measuring time irrespective of the do input current up to 20 nA. An highly linear 300 GOmega active resistance, used in the feedback network to extend the lower limit of the bandwidth down to 100 Hz, will be also described.
Keywords :
CMOS integrated circuits; capacitance; circuit feedback; electric resistance; low noise amplifiers; CMOS technology; active resistance; dc input current; feedback network; integrator capacitance; integrator-differentiator scheme; low-conductivity nanobio devices; transimpedance amplifier; Bandwidth; CMOS technology; Capacitance; Circuit noise; Feedback; Impedance measurement; Integrated circuit measurements; Measurement standards; Nanoscale devices; Paper technology;
Conference_Titel :
Research in Microelectronics and Electronics, 2008. PRIME 2008. Ph.D.
Conference_Location :
Istanbul
Print_ISBN :
978-1-4244-1983-8
Electronic_ISBN :
978-1-4244-1984-5
DOI :
10.1109/RME.2008.4595760
