Chameleon: a dual-mode 802.11b/Bluetooth receiver system design

Low-Power Direct Conversion Transceiver for 915 MHz Band IEEE 802.15.4b Standard Based on 0.18 μm CMOS Technology

“…Similar to the effect of noise, the third-order intermodulation product (IM3) must be less than the desired signal by the value of the required SNR min . Therefore, the IIP 3 of the receiver can be calculated as given in [8] and [12] …”

“…Like the IIP 3 , the IIP 2 test is performed when two nearby interferers at f 1 and f 2 equal f 1 -Δf. Because the receiver produces a second-order distortion, a low frequency beat at Δf appears at the output of the receiver [12]. So that the receiver can detect the desired signal, this low-frequency beat must be less than the desired signal by the SNR min value.…”

“…So that the receiver can detect the desired signal, this low-frequency beat must be less than the desired signal by the SNR min value. Therefore, the minimum required IIP 2 of the receiver is given as in [12] by 2 …”

A new CMOS channel select filter for dual mode bluetooth/WLAN direct-conversion receiver

“…Although this architecture suffers from non-linear DC offset problems caused by selfmixing, DC component can be removed with DC offset correction methods to avoid saturating the receiver [1,2]. A high dynamic range low pass filter must be incorporated in the direct-conversion receiver for channel selection [3][4][5][6][7][8][9][10][11]. The characteristics of the filter dominate the performance of the overall receiver.…”

“…Moreover, a 4th-order filter is found to be sufficient to meet the selectivity requirements of both standards. Furthermore, the optimum bandwidth is 600 kHz and 5.5 MHz for the BT and WLAN modes, respectively [3].…”