Title :
Noise Analysis of Switched Capacitor Networks in Direct Sampling Mixers
Author :
Nasu, Takafumi ; Araki, Kiyomichi
Author_Institution :
Kiyomichi Araki Grad. Sch. of Eng., Tokyo Inst. of Technol., Tokyo
Abstract :
In order to improve the noise figure (NF) of the direct sampling mixer (DSM), thermal noise corresponding to on-resistance of the MOS switch, one of the noise sources in the DSM, is analyzed, and the noise transfer function is derived. As a result, at the output terminal of the DSM, its influence on the desired signal is sufficiently small as compared with the influence which tranceconductance amplifier (TA) in the first stage of the DSM causes. In the DSM, internal noise from switched capacitor filter (SCF) section can be neglected.
Keywords :
MIS devices; discrete time systems; mixers (circuits); radiofrequency amplifiers; switched capacitor filters; thermal noise; transfer functions; RF circuits; direct sampling mixers; discrete time receiver; noise analysis; noise transfer function; switched capacitor networks; thermal noise; tranceconductance amplifier; Circuits; Filtering; Finite impulse response filter; Noise figure; Noise measurement; Radio frequency; Sampling methods; Switched capacitor networks; Switches; Transfer functions; Direct Sampling Mixer; Switched Capacitor Filter; discrete time receiver; noise analysis;
Conference_Titel :
Microwave Conference, 2007. KJMW 2007. Korea-Japan
Conference_Location :
Okinawa
Print_ISBN :
978-1-4244-1556-4
DOI :
10.1109/KJMW.2007.4402240
