Title :
An Ultra-Low Drift Amplifier Using a New Type of Series-Shunt MOSFET Chopper
Author :
Abe, Minoru ; Sugisaki, Iwao ; Nakazoe, Jun ; Abe, Zenmon
fDate :
3/1/1985 12:00:00 AM
Abstract :
A chopper amplifier of a new type is proposed for the amplification of nanovolt-order dc voltage. The chopper is built by connecting a shunt switch, which is driven at twice the chopper frequency, to the output terminals of a conventional and balanced-type series-shunt MOSFET chopper. The present chopper is free from offset voltage arising from spike voltages and has an input voltage offset temperature coefficient of less than 0.1 nV/??C for a signal source of less than 1 k??, and a long-term drift of 2 nV/18 h for signal source resistance of 6.1 ??.
Keywords :
Apertures; Charge coupled devices; Charge-coupled image sensors; Choppers; Frequency measurement; MOSFET circuits; Particle measurements; Switches; System testing; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1985.4315256
