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Analog baseband IC for use in direct conversion W-CDMA receivers

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9 Author(s)
Goldfarb, M. ; Analog Devices Inc., Wilmington, MA, USA ; Palmer, W. ; Murphy, T. ; Clarke, R.
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A 0.6 /spl mu/m BiCMOS analog baseband IC that enables a direct conversion W-CDMA receiver is described. Two diversity I/Q channels provide 87 dB of voltage gain, controllable in 1-dB steps. A 2 MHz low pass filter, synchronized to an external RC network, provides an accurate rejection mechanism against adjacent channel interference. A log amp provides a "Fast-RSSI" function for rapidly selecting gain settings. Low DC current (<5 mA/path), low input noise (<4 nV/Hz/sup 1/2/), and a high P3dB (-20 dBVrms) are achieved.

Published in:

Radio Frequency Integrated Circuits (RFIC) Symposium, 2000. Digest of Papers. 2000 IEEE

Date of Conference:

10-13 June 2000