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    A 20-MHz 0.323-mW 23.9-dBm-IIP3 4th-order current-reuse lowpass filter
    (2021-05-19)
    Thanapitak, Surachoke
    ;
    Chulajata, Tatcha
    ;
    Sedtheetorn, Pongsatorn
    ;
    Hayatleh, Khaled
    ;
    Surakampontorn, Wanlop
    A source follower lowpass filter which has a capability of bulk-attenuation cancellation in higher order is presented. Under strong inversion bias arrangement for high frequency application, this fourth-order-filter is simulated in a 0.18 μm standard CMOS process and exhibits a 20 MHz bandwidth with total power consumption of 0.323 mW from 1.8 V supply. Third order intermodulation distortion verification with 1.9 and 2.1 MHz signal archives 23.9 dBm IIP3 with 75.5 dB dynamic range. By using figure-of-merit as a benchmark indicator, the proposed filter is one of the top in its class with the lowest power consumption.
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    Fading analysis of vegetation density effects on path loss for 1.8 GHZ cellular mobile with low base station antenna height
    (2006-12-01)
    Phaiboon, Supachai
    ;
    Pitithammawong, Kitti
    ;
    Chulajata, Tatcha
    ;
    Somkuarnpanit, Suripon
    This paper presents studies of propagation characteristics in a suburban forest based on a measurement campaign at a frequency of 1.8 GHz. We investigated how tree density affected the fast fading characteristic depending on tree density and base station antenna height in a range of 3, 4, and 5 m above ground while the receiving antenna height was fixed at 1.8 m above ground. Three categories were studied: high density area, low density areas and grass area. Measurement of the receiver signal over 120 s intervals for a stationary mobile were used to obtain the distribution functions for the fading. We found that the distributions followed a Rician distribution, whose K-factor depended on tree density and transmitter height.