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High Performance VCO for Low Power RF Transmitter-A Review

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Author(s): Mrunalini Nandanwar | Deepak Dandekar

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: ncipet;
Issue: 2;
Date: 2012;
Original page

Keywords: Voltage-controlled oscillator (VCO) | CMOS | low power | low phase noise | FOM

ABSTRACT
A typical RF transmitter requires maximum start up time. The transient energy during the startup can be higher than the energy required by the electronics during the actual transmission. In order to reduce start up energy consumption, reduce the power dissipation in transmitter. This power dissipation in transmitter is reduced by lowering the phase noise of VCO.In this paper comparison is made between different architectures of CMOS LC tank VCO such as differentional cross coupled, complementary cross coupled ,cross coupled with pseudo resistance and Quadrature VCO with reconfigurable LC tank which are used to design high performance LC tank VCO for low power RF transmitter .From the comparison table 1,we note that complementary cross coupled LC VCO provides best tuning range i.e.21% and cross coupled with pseudo resistance LC VCO provides lowest phase i.e.-125.5 dBc/Hz among the other VCOs, it also has minimum power consumption, highest tuning range and best FOM i.e.-190.84.

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