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A dual-band wide range LC voltage controlled oscillator (VCO) with highly linear frequency tuning characteristics for GNSS application is presented. The linearity of VCO includes the coarse and fine tuning sensitivity variations, which are defined as the frequency step per-code (fstep) variation and the VCO gain (KVCO) variation, respectively. Compared to the conventional circuit topology, the proposed...
A fully integrated direct up-conversion transmitter for Chinese electronic toll collection system (ETCS) is presented in a 0.18um CMOS process. Improved isolation between power amplifier (PA) and voltage-control oscillator (VCO) is achieved by configuring the VCO frequency to be 2/3 transmission frequency. A 5.8GHz mixer with an automatic amplitude control (AAC) loop is proposed to obtain better amplitude...
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