By R. Schaback, K. Scherer
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Excluding the LNAs and power amplifiers, the building blocks are shared between all modes. 5 GHz) were employed. The channel-selection LPFs in the receiver and transmitter paths are fourth-order Butterworth and fourth-order Chebyshev, respectively. Their bandwidths are accurately set by a calibration engine. Two highpass poles are inserted in the receiver path; one is in front of the variable-gain amplifier (VGA), and the other is a servo loop round the LPF. The former and latter pole frequencies are <200 Hz and <1 kHz in all process corners, respectively, ensuring that multipath fading and worst-case frequency offset result no significant performance degradation.
Klepser, “A Highly Integrated, Dual-Band, MultiMode Wireless LAN Transceiver,” in Proc. European Solid-State Circuits Conference (ESSCIRC), pp. 229–232, Sept. 2003. 100]J. , “A Fully Integrated Multi-Band MIMO WLAN Transceiver RFIC,” IEEE Symposium on VLSI Circuits (VLSI), Digest of Technical Papers, pp. 290–293, June 2005. 101]O. 11a/b/g Transceiver IC for Cellular and Bluetooth Co-Existence Applications,” in Proc. European Solid-State Circuits Conference (ESSCIRC), pp. 129–132, Sept. 2005. [ZIF/DU] Chapter 3 TWO-STEP CHANNEL SELECTION – A TECHNIQUE FOR MULTISTANDARD TRANSCEIVER FRONT-ENDS 1.
Again, the image is eliminated through signal cancellation rather than filtering. Since the image is the desired channel itself, the demanded I/Q matching is practically achievable for most applications. , dc offset and 1/f noise. With them superimposed on the desired channel, a substantial degradation in signal-to-noise ratio (SNR) or completely desensitizing the system due to a large baseband gain may result. A capacitive coupling and a servo loop are common choices to alleviate this problem, but at the expense of long settling time and large chip area for realizing the very low cutoff-frequency highpass pole.
Approximation Theory by R. Schaback, K. Scherer