A dual-mode 802.11b/Bluetooth receiver in 0.25μm BiCMOS

A Short Range, Low Data Rate, 7.2 GHz-7.7 GHz FM-UWB Receiver Front-End

“…The Zigbee and UWB receiver front-ends reported in [23], [24] achieve about 10 dB better sensitivity, but consumes 3 to 4 times more power and require more chip area in their implementations. Comparable sensitivity at the same BER is realized by the Bluetooth front-end from [25] at a higher data rate, however, higher power is again consumed. The FSK narrowband receiver design reported in [26] realizes 20 dB better sensitivity operating in the ISM band around 0.9 GHz, where gain is easier to realize at low current consumption.…”

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.…”

A new concept for front‐end circuit integration: From single‐ended antenna to differential‐input connection without any external balun

“…However, the following stage, that is, the low-noise amplifier (LNA), usually involves balance topology, with the exception of the band-select off-chip bandpass filter. Also, several receiver designs are differential input [2][3][4]. Therefore, the transition from a single-ended to a differential-input signal, that is, via balun or transformer, is necessary when the wideband differential signal is considered.…”

“…In the microwave-filter regime, coupled-line resonators [1] have widely been studied for suppressing the spurious responses or improving the out-of-band characteristics of a BPF [2,3]. One of the advantages of a coupled-line /2 resonator is that an attenuation pole can be generated in the stopband due to the natural coupling between the coupled lines [1].…”

“…However, it still suffers from the spurious responses that exist on integral multiples of f 0 . Therefore, many efforts had been made to improve the spurious responses the coupled-line BPF [2][3][4], where complicated structures between the coupling elements or between the input/output (I/O) ports are usually required. In this paper, a method that requires the grounding of one resonator of a parallel partially coupled-line BPF is presented in order to realize improved out-of-band characteristics by locating the multiple attenuation poles in the stopband, and the influence of the length of partially coupled-line section on the spurious responses is studied numerically.…”