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This paper presents a dual-mode multiband transceiver with DigRF interface implemented in a 0.13- CMOS technology. Based on direct conversion architecture, blocks in the transceiver can be configured to simultaneously support wavelength code-division multiple access (WCDMA) band I and four Global System for Mobile Communications (GSM) bands (PCS/DCS/GSM900/GSM850). In the receiver path,...
A 930MHz Gilbert mixer with improved linearity and noise figure is presented. To achieve high linearity, the transconductance stage is biased at the sweet spot by a high-precision automatic optimum biasing circuit; and an active-inductor-based series LC network resonating around twice the signal frequency is implemented at the common source nodes of the switch quad to alleviate the second-order interaction...
A dual-band 2.1GHz/5.2GHz low noise amplifier (LNA) which can operate at mobile band of 2.1GHz and WLAN band of 5.2GHz frequency is proposed. Input matching, noise matching and narrow-band amplifying are achieved at two frequency bands by adopting a switched inductive output load and a positive-negative feedback circuit. The proposed LNA is implemented in SMIC 0.13 μm CMOS technology with a supply...
A high linearity variable gain low noise amplifier (VGLNA) used for WCDMA receiver is presented. Power constrained simultaneous noise and input matching (PCSNIM) technique is adopted to design the inductive source degenerated LNA. To improve the dynamic range of the receiver, capacitive divider and current steering technique are adopted to implement the three gain modes. The chip was manufactured...
A low power CMOS fully-integrated on-chip inductor-less low noise amplifier (LNA) designed for short range devices (SRDs) in 0.25-mum CMOS process is presented. It is working at 315 MHz and 433 MHz. Common gate input topology is adopted to realize wideband impedance matching without tuning. Cross coupled common-gate input technique is adopted to improve the noise performance of conventional common-gate...
This paper presents the design of a direct conversion receiver front-end for UWB application. Its key feature is a wideband balun-coupled noise cancelling transconductance input stage, followed by double-balanced quadrature passive mixers and transimpedance loading amplifiers. Simulation results show that the front-end achieves an input return loss (S11) below -10 dB between 3-5 GHz, a voltage conversion...
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