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To handle the 12dB peak-to-average-power ratio (PAPR) of OFDM signals in a 802.11a/g WLAN receiver baseband, an instantaneously companding system consisting of a 5-order low pass SC filter and a 10-bit pipeline ADC is presented. The filter cut-off and clock frequencies are 10MHz and 100MHz respectively and the ADC sampling frequency is 25MS/s. The filter provides the compressed output directly to...
To handle peak-to-average power ratio in 802.11a/g WLAN RX baseband, a 5th-order, 10.5 MHz cut-off frequency, instantaneously companding SC LPF is fabricated in a 0.13 ??m CMOS process. It occupies 2.2 mm2 active chip area and consumes 53 mW with a DR of 79 dB over an SNDR of 34 dB and EVMrms<3.8%, saving 3.3?? power and 1.5?? chip area as compared to the non-companding case.
The IEEE WLAN 802.11a/g standard requires short time interval (5.6 mus) for automatic gain control (AGC) convergence during reception of the preamble in each data packet. Due to this stringent settling time requirement, most of the AGC is implemented after the baseband filter, which leads to high power consumption in the baseband filter. In this paper, we present syllabic companding using switched...
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