Low-Power Quadrature Receivers for ZigBee (IEEE 802.15.4) Applications

A 2.4-GHz ZigBee Receiver Exploiting an RF-to-BB-Current-Reuse Blixer + Hybrid Filter Topology in 65-nm CMOS

“…The wideband input-matching network is also responsible for the pre-gain to enhance the NF. Unlike the LMV cell that only can utilize single-balanced mixers [7], here the .2 a Circuit-reuse receiver merging RF LNA and BB TIA [9]. b Its single-ended equivalent circuit illustrating its RF-to-BB operation conceptually (from right to left) and ±V o,Q ) through the complex-pole load, which performs both image rejection and channel selection.…”

“…The gain peak at around 2.4-2.5 GHz is from the passive pre-gain. Following the linearity test profile of [7], two tones at [LO + 12 MHz, LO + 22 MHz] are applied, measuring an IIP3out-band of -6 dBm (Fig. 3.16c) at the maximum gain of 57 dB (there is 24-dB gain loss in Fig.…”

“…Finally, as their baseband (BB) channel selection and image rejection are out of their current-reuse paths, any large out-band blockers will be converted into voltages before filtering. This fact constitutes a hard tradeoff between noise, linearity and power (i.e., 1.2-mW BB power in [7] and 5.2-mW BB power in [8]). …”

Optimal Low Power Complex Filters

“…Active complex (polyphase) filters are renewed as they provide the solution for image rejection in low-IF wireless applications such as Bluetooth (BT) receiver [1]- [13]. To understand the ability of complex filters in rejecting the image signal, the complex representation of the receiver block diagram shown in Figure 3 is considered.…”

Power Scalable Radio Receiver Design Based on Signal and Interference Condition

“…15.4 has been proposed in a few papers [7,8] . In [7], authors proposed a front end design in 0.18 µ CMOS technology that consumes 4.32 mW, whereas in a more recent paper the authors in [8] proposed a front end in 90 nm technology that consumes 3.6 mW when active. Authors in [9] have discussed power consumption of various wireless technology for WPAN applications.…”