A 5.8 GHz Single-Ended to Differential Transformer Matched CMOS Low Noise Amplifier
Date Issued
2012
Date
2012
Author(s)
Chen, Johnny
Abstract
The spread of mobile computing devices has increased the demand for wireless local networks (WLAN). WLANs can be set up at home or at the workplace to serve as a convenient way to access the internet. Many WLAN devices utilize the unlicensed frequencies in the 5 GHz band. Consumer demand requires WLAN devices that are low cost, small in size, lightweight, and have a long battery life. A crucial component for WLAN devices are the radio frequency (RF) front-end transceivers. Typically, the RF front-end circuits are differential to minimize the effect of ground noise on a low noise amplifier (LNA). Thus, Baluns are required to interface the single-ended antenna with the differential RF circuits.
In this thesis, a two-stage single-ended to differential 5.8 GHz LNA is presented. This particular LNA utilizes center tapped transformers to provide bias voltages and to reach optimal matching for input impedance, output impedance, and noise. The architecture used is the cascode inductively degenerated common source amplifier for both stages. A complementary-conducting-strip transmission line (CCS TL) based Marchand Balun was used in between the stages to convert the single ended signal into a differential signal. The LNA is fabricated in a standard 0.13 μm 1P8M CMOS process. The gain for the proposed single-ended to differential LNA is 17.9 dB with a noise figure of 5.39 dB. This LNA consumes 26.4 mW of power using a 1.2 V bias voltage. The area of the proposed amplifier is 720 μm × 1835 μm excluding an output balun for measurement.
Subjects
LNA
low-noise amplifier
transformer matching
WLAN
Type
thesis
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