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Multimode cellular RFICs need high dynamic range in order to simultaneously satisfy the high linearity requirements of LTE and the low-noise performance of 2G. Traditionally, SAW filters are employed to relax the noise-linearity trade-off at the cost of higher BOM. In a highly competitive market, mobile devices need to support >35 LTE bands, a number which is expected to rise further in the future,...
This paper presents a wide dynamic range (DR) CMOS root-mean-square power detector with a temperature variation compensation technique in a 28-nm CMOS process. The cascaded gain amplifiers and squaring circuits in the proposed power detector can achieve wide DR with the power level segmented detection method using a switch driver with the help of a modem. A 12-bit current digital-to-analog converter...
In this paper, we present a prototype of a concurrent dual-channel RF transceiver module with diversity for wireless access in vehicular environment (WAVE) system. Two parallel RF paths are designed for concurrent communication. At each moment of time, both transceivers in the RF paths are simultaneously operated as transmitters or receivers. In each path, two antennas are connected with a diversity...
This paper describes a receiver composed of a wideband LNA, mixers, and a frequency generator toward multifunction and multistandard mobile terminals. The proposed frequency generator can cover the frequency range from 750 MHz to 6.75 GHz by following the frequency planning which consists of a VCO, two mixers, and four divide-by-2 dividers. Firstly, to achieve better phase noise, a low-phase noise...
In this paper, a 2.4-GHz low-power LC VCO with high performance in phase noise is designed and implemented in 0.18um CMOS process for IEEE 802. llg WLAN. Based on measurement results, it has the phase noise of -121.11dBc/Hz @lMHz offset from a 2.4GHz carrier. The total power dissipation is only 0.675 mW at 1.2-V power supply voltage. The oscillator is tuned from 2.28 GHz to 2.47 GHz while a tuning...
A multi-band 900 MHz/1.8 GHz/5.2 GHz low noise amplifier (LNA) which can operate at mobile band of 900 MHz and 1.8 G and WLAN band of 5.2 GHz frequency is proposed. Input matching, noise matching and narrow gain are achieved at three frequency bands by adopting a switched output load and a resistive shunt-feedback circuit. The proposed LNA is designed in TSMC 0.18 um CMOS technology with a supply...
A full PMOS, low phase noise, and wideband VCO with an automatic amplitude controller (AAC) is presented The frequency band and tuning voltage are 2.78-3.78 GHz and 0-1.8 V, respectively. The measured phase noises at 1 MHz from carrier frequencies of 2.83, 3.24, and 3.77 GHz are -126.5, -125.0 and -122.7 dBc/Hz, respectively. With 1.8 V voltage supply, the current flowing into the VCO core varies...
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