TY - GEN
T1 - Design of an active 2nd-order polyphase filter for image rejection in subsampling receivers
AU - Maier, Daniel
AU - Brachtendorf, Hans Georg
PY - 2018/6/8
Y1 - 2018/6/8
N2 - Receivers that work with real subsampling, have the disadvantage that they can not transform a bandpass signal directly to baseband. By using complex subsampling, direct conversion into the baseband is made possible. For this purpose, the bandpass signal must first be converted into a complex or analytic signal. This signal, consisting of real and imaginary parts, is filtered by a polyphase filter. This type of filter allows the transition of positive frequencies and filtering the corresponding negative frequencies. In order to ensure the requirements of the receiver, a high image rejection between negative and positive frequencies must be achieved. This can be done by cascading several first-order filters. To obtain a cheap cost alternative, a novel second-order polyphase filter is described, employing only half the number of OpAmps compared to known cascaded first-order filters. For this reason, this paper focuses specifically on the design and verification of a second-order polyphase filter on a printed-circuit-board (PCB).
AB - Receivers that work with real subsampling, have the disadvantage that they can not transform a bandpass signal directly to baseband. By using complex subsampling, direct conversion into the baseband is made possible. For this purpose, the bandpass signal must first be converted into a complex or analytic signal. This signal, consisting of real and imaginary parts, is filtered by a polyphase filter. This type of filter allows the transition of positive frequencies and filtering the corresponding negative frequencies. In order to ensure the requirements of the receiver, a high image rejection between negative and positive frequencies must be achieved. This can be done by cascading several first-order filters. To obtain a cheap cost alternative, a novel second-order polyphase filter is described, employing only half the number of OpAmps compared to known cascaded first-order filters. For this reason, this paper focuses specifically on the design and verification of a second-order polyphase filter on a printed-circuit-board (PCB).
KW - Active Polyphase Filter
KW - Complex Subsampling
KW - Direct Baseband Conversion
KW - Gingell Passive Polyphase Filter
KW - Image Rejection
UR - http://www.scopus.com/inward/record.url?scp=85049981405&partnerID=8YFLogxK
U2 - 10.1109/RADIOELEK.2018.8376371
DO - 10.1109/RADIOELEK.2018.8376371
M3 - Conference contribution
AN - SCOPUS:85049981405
T3 - 2018 28th International Conference Radioelektronika, RADIOELEKTRONIKA 2018
SP - 1
EP - 6
BT - 2018 28th International Conference Radioelektronika, RADIOELEKTRONIKA 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 28th International Conference Radioelektronika, RADIOELEKTRONIKA 2018
Y2 - 19 April 2018 through 20 April 2018
ER -