Title :
A comparison of substrate noise coupling in lightly and heavily doped CMOS processes for 2.4-GHz LNAs
Author :
Hazenboom, Scott ; Fiez, Terri S. ; Mayaram, Kartikeya
Author_Institution :
Adv. Navigation & Positioning, Hood River, OR, USA
fDate :
3/1/2006 12:00:00 AM
Abstract :
This paper examines the substrate noise injected into three different types of 2.4-GHz low-noise amplifiers for both heavily and lightly doped CMOS substrates. The amplifiers include the commonly used single-ended and differential topologies as well as a new quasi-differential amplifier. For the single-ended amplifier, the noise coupling modeled in SPICE is in good agreement with measurements. Using these models and simulations, the major noise coupling mechanisms are identified and methods of noise mitigation are evaluated. In the differential amplifier, it is shown that even though the substrate noise is common mode, the intermodulation noise is not reduced. The quasi-differential amplifier performance is comparable to the differential amplifier for lightly doped substrates.
Keywords :
CMOS analogue integrated circuits; SPICE; UHF amplifiers; UHF integrated circuits; integrated circuit noise; low noise amplifiers; 2.4 GHz; SPICE; differential amplifier; differential topology; heavily doped CMOS substrate; intermodulation noise; lightly doped CMOS substrate; low-noise amplifier; quasidifferential amplifier; single-ended amplifier; single-ended topology; substrate noise coupling; CMOS process; Circuit noise; Coupling circuits; Differential amplifiers; Low-noise amplifiers; Noise generators; Optical coupling; Radio frequency; Semiconductor device modeling; System-on-a-chip; Amplifiers; heavily doped substrate; lightly doped substrate; low-noise amplifier; noise coupling; substrate noise coupling;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2006.869790
