Title :
A variable gain RF front-end, based on a Voltage-Voltage feedback LNA, for multistandard applications
Author :
Rossi, Paolo ; Liscidini, Antonio ; Brandolini, Massimo ; Svelto, Francesco
Author_Institution :
Dept. of Electron., Univ. of Pavia, Italy
fDate :
3/1/2005 12:00:00 AM
Abstract :
Employing feedback circuits in RF front-ends can be a key aspect for easy reconfiguration of multistandard receivers. A narrow-band filter can shape the frequency transfer function and, by reflection due to the feedback network, the input impedance. Switching one single filter component thus allows selecting a different standard. We introduce a voltage-voltage feedback low noise amplifier that, besides being easily reconfigurable, shows roughly the same noise and better linearity, for same power consumption, as the conventional inductively degenerated topology. A direct conversion front-end, including the LNA and I and Q mixers, tailored to WLAN applications in the 5-6 GHz range, has been realized in a 0.25-μm SiGe BiCMOS process. Prototypes show the following performances: 2.5 dB NF, 31.5 dB gain, -9.5dBm IIP3, and +23dBm minimum IIP2 while consuming 16 mA from a 2.5 V supply.
Keywords :
BiCMOS integrated circuits; Ge-Si alloys; IEEE standards; feedback amplifiers; radio receivers; wireless LAN; 0.25 micron; 2.5 V; 2.5 dB; 31.5 dB; 5 to 6 GHz; BiCMOS process; HiSWANa; HiperLAN2; IEEE 802.11a; Q mixers; RF front-ends; RF receiver; SiGe; WLAN applications; direct conversion; feedback amplifier; feedback circuits; frequency transfer function; low noise amplifier; multistandard receivers; narrow-band filter; power consumption; voltage-voltage feedback; wireless local area network; Acoustic reflection; Feedback circuits; Filters; Gain; Impedance; Multi-stage noise shaping; Narrowband; Radio frequency; Transfer functions; Voltage; BiCMOS; HiSWANa; HiperLAN2; IEEE 802.11a; RF receiver; direct conversion; feedback amplifier; low noise amplifier (LNA); mixer; multiband; multistandard; wireless local area network (WLAN);
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2005.843631
