Title :
AC coupling in direct-conversion receiver for TD-SCDMA mobile
Author_Institution :
Philips
Abstract :
The AC coupling circuit is widely used in direct-conversion receivers to suppress the in-band DC offset and 1/f noise. This paper analyzes the requirements of the AC coupling circuit in a TD-SCDMA mobile phone operating in an environment with strong out-of-band interference. In this paper, a passive first-order high-pass filter is assumed to act as the AC coupling circuit. The recommended cutoff frequency of this high-pass filter is within the range of 10 kHz-30 kHz in order to achieve a required 2nd-order intermodulation intercept point (IIP2) of 36.7 dBm-36.3 dBm with a signal-to-noise ratio loss of less than 0.3 dB
Keywords :
code division multiple access; coupled circuits; high-pass filters; mobile handsets; mobile radio; radio receivers; radiofrequency interference; space division multiple access; time division multiple access; 2nd-order intermodulation intercept point; AC coupling circuit; TD-SCDMA mobile; direct-conversion receiver; first-order high-pass filter; intermodulation intercept point; mobile phone; out-of-band interference; signal-to-noise ratio;
Conference_Titel :
Mobile Technology, Applications and Systems, 2005 2nd International Conference on
Conference_Location :
Guangzhou
Print_ISBN :
981-05-4573-8
DOI :
10.1109/MTAS.2005.243822
