Title :
A 2-GHz quadrature hybrid implemented in CMOS technology
Author :
Frye, Robert C. ; Kapur, Sharad ; Melville, Robert C.
Author_Institution :
Agere Syst., Murray Hill, NJ, USA
fDate :
3/1/2003 12:00:00 AM
Abstract :
We have derived a lumped-element circuit from its coupled line counterpart for a quadrature hybrid coupler. We discuss the uses, design, and characteristics of such circuits in CMOS technology. We show measured characteristics of an example 50-Ω 2-GHz coupler with 65 dB of image rejection, 22 dB of directivity, and a 4.7-dB noise figure.
Keywords :
CMOS integrated circuits; UHF integrated circuits; coupled circuits; directional couplers; lumped parameter networks; 2 GHz; 4.7 dB; 50 ohm; CMOS technology; capacitor network; coupled-inductor pair; directional couplers; directivity; image rejection; lumped-element circuit; quadrature hybrid coupler; CMOS technology; Coupling circuits; Directional couplers; Distributed parameter circuits; Frequency; Impedance; Inductors; Mutual coupling; Prototypes; Resonance;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.808287
