Conference Proceeding

A Low Noise VCO with Quadrature Prescaler for UHF RFID Reader

Inst. of Microelectron. Circuit & Syst., East China Normal Univ., Shanghai
05/2009; DOI:10.1109/NSWCTC.2009.217 In proceeding of: Networks Security, Wireless Communications and Trusted Computing, 2009. NSWCTC '09. International Conference on, Volume: 1
Source: IEEE Xplore

ABSTRACT A low phase noise CMOS LC VCO working at 1.8 GHz with quadrature prescaler for single-chip UHF 860 - 960 MHz RFID reader is proposed in this paper. The symmetrical filtration technology is adopted to suppress noise for complementary cross coupled LC VCO. FOM method is applied in low-noise VCO design. Injection locked prescaler with ring oscillator core can provide wide locking range. The proposed LC VCO and prescaler are implemented in IBM 0.18 mum RF CMOS technology. The measurement results show that the VCO achieves a phase noise of -132 dBc/Hz at 1 MHz offset from 1.8 GHz while drawing 10.5 mA from a 3.3 V power supply. The tuning range of the proposed LC VCO covers from 1.71 GHz to 2.19 GHz. The locking range of the proposed prescaler is 66.35% with in-phase and quadrature outputs.

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Keywords

1 MHz
 
960 MHz RFID reader
 
GHz
 
IBM 0.18 mum RF CMOS technology
 
LC VCO
 
locking range
 
low phase noise CMOS LC VCO
 
measurement results
 
proposed LC VCO
 
quadrature outputs
 
single-chip UHF 860
 
symmetrical filtration technology
 
tuning range
 
wide locking range
 

Chunqi Shi