A 50-MHz BiCMOS quadrature charge sampler and complex bandpass SC filter for narrowband applications

Author

Karvonen, Sami ; Riley, Tom ; Kurtti, Sami ; Kostamovaara, Juha

Author_Institution

Dept. of Electr. Eng., Oulu Univ., Finland

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

An implementation of a quadrature charge sampler and a complex bandpass switched-capacitor (SC) filter in 0.8 μm BiCMOS applicable to narrowband low-IF receivers is presented. The circuit quadrature downconverts a 49.85-MHz IF input signal to a low IF of 15 kHz by charge-mode subsampling and performs further complex narrowband filtering on the signal. The measured image rejection is more than 44 dB on the 26.3 kHz -3 dB bandwidth.

Keywords

BiCMOS integrated circuits; band-pass filters; circuit testing; integrated circuit design; radio receivers; switched capacitor filters; 0.8 micron; 15 kHz; 26.3 kHz; 49.85 MHz; BiCMOS; IF input signal downconversion; bandpass filter; charge-mode subsampling; circuit quadrature; complex bandpass SC filter; complex narrowband filtering; image rejection; narrowband applications; narrowband low-IF receivers; quadrature charge sampler; switched-capacitor filter; Band pass filters; BiCMOS integrated circuits; Capacitors; Filtering; Finite impulse response filter; Frequency; Narrowband; Passband; Sampling methods; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328225

Filename

1328225