Current reused Colpitts VCO and frequency divider for quadrature generation

Author

Ji, Xincun ; Wu, Jianhui ; Shi, Longxing

Author_Institution

Nat. ASIC Syst. Eng. Res. Center, Univ. of Southeast, Nanjing, China

fYear

2011

fDate

15-17 April 2011

Firstpage

256

Lastpage

259

Abstract

Abstract-A 2.5 GHz low power current reused Colpitts VCO and divide-by-two circuit is proposed in 0.18μm CMOS technology. The divider is stacked on top of a common drain g_m-boosted differential Colpitts VCO to share the DC current. A parasitic capacitance neutralization technique is used to eliminate the miller effect with the VCO, and improves the generated negative resistance and phase noise performance. The circuit can provide a 2.36-2.53GHz quadrature output frequency, and consume 4mW at 1.8V supply voltage. The simulated output phase noise is -126dBc/Hz at 1 MHz offset frequency when the divider output is 2.45 GHz.

Keywords

CMOS integrated circuits; frequency dividers; negative resistance circuits; phase noise; voltage-controlled oscillators; CMOS technology; Miller effect; current reused Colpitts VCO; frequency 2.36 GHz to 2.53 GHz; frequency 2.45 GHz; frequency 2.5 GHz; frequency divider; negative resistance; parasitic capacitance neutralization; phase noise performance; power 4 mW; quadrature generation; quadrature output frequency; size 0.18 mum; voltage 1.8 V; Capacitance; Frequency conversion; Impedance; Logic gates; Phase noise; Voltage-controlled oscillators; CMOS; Colpitts VCO; Miller effect neutralization; current reuse; quadrature output;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Information and Control Engineering (ICEICE), 2011 International Conference on

Conference_Location

Wuhan

Print_ISBN

978-1-4244-8036-4

Type

conf

DOI

10.1109/ICEICE.2011.5777347

Filename

5777347