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A broadband highly linear Voltage controlled oscillator (VCO) for multi-standard wireless transceivers application is presented in this paper. Highly linear VCO gain (Kvco) is exhibited in the VCO which can realize a linear Kvco, better phase noise performance and more stable oscillation in same time. A 6-bit switched capacitor array is employed to extend the tuning range, and also 6-bit switched...
An automatic frequency calibration (AFC) for wide-band frequency synthesizers is presented in this paper. To achieve low phase noise, 6-bits switched-capacitors banks are employed in the VCO. The whole AFC is working under the control of reference clock to overcome the competition adventure that may caused by asynchronous sequential. One extra comparison is used to finally determine the optimum sub-band...
This paper presents a wideband CMOS LC voltage controlled oscillator (VCO) with switched current source for 3.4–3.6GHz IMT-Advanced and 4.1–4.8GHz UWB applications. Reconfigurable LC tank with switch control is adopted to accomplish dual band operation and selection. The LC-VCO is fabricated in TSMC0.13μm CMOS process, and fully evaluated on wafer. Bias filters are used in this LC-VCO design to suppress...
A broadband Voltage controlled oscillation (VCO) is presented in this paper. The VCO is implemented in 0.13μm CMOS technology with 1.2V supply voltage. The circuit allows the VCO to operate at two resonant frequencies with two LC tanks. Simulation shows the low band operates at 2.46∼4.2GHz while the high band operates at 4.0∼5.4GHz, the proposed VCO output covers frequency band from 2.46GHz to 5.4GHz...
In this paper, a two-stage cascaded power amplifier (PA), which consists of cascode topology, for Multi-band systems operating in the 0.7–6GHz frequency range is presented. The shunt-shunt feedback and shunt peaking is used to improve wideband matching. To achieve sufficient linearity and efficiency, this PA operates in the Class-AB regime. It is designed in SMIC 0.13μm RF CMOS process. The proposed...
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