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This paper reports an LC-based digitally controlled oscillator (DCO) in 65 nm CMOS, key component in a digital phase locked loop, with an enhanced frequency resolution and extended tuning range. It has a center frequency of 5.8 GHz and a tuning range of 1800 MHz. The finest frequency step is about 20 kHz. The oscillator exhibits a phase noise of -100 dBc/Hz at 100 kHz frequency offset from 4.9 GHz...
This paper deals with the design problems associated to the implementation of low power wide tuning band low phase noise LC VCOs in low cost Si-integrated technologies. For that, a VCO was developed using a low cost 0.35 mum 2-poly 4-metal standard CMOS technology. The VCO uses a radio frequency switched varactor array (RFSVA) in the tank circuit in order to decrease the influence of the varactor...
A 12th order active-RC filter for DVB Tuner applications with automatic frequency tuning (AFT) is presented in this paper. The filter is implemented in Butterworth biquad structure. The AFT circuit is introduced to compensate the frequency variation by a 7-bits switched-capacitor array. The measurement results indicate that the precision of tuning circuit can be controlled less than plusmn2.3%, the...
A 5.4 GHz digitally controlled oscillator (DCO) has been implemented in a 90-nm CMOS process. It has three different frequency control words, coarse, medium, and fine. The coarse control bank uses MIM capacitors and differential MOS switches. The other banks use MOS varactors. The phase noise was measured at the output of an on-chip divide by 2 circuit. It is -132 dBc/Hz at 3 MHz offset from the 2...
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