Title :
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
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;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328225
