Browsing by Author "Decha Wilairat"

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    A 1 GHz CMOS analog equalizer for perpendicular magnetic recording
    (2010-12-01) Sukarasut Meksiri; Kasin Vichienchom; Decha Wilairat; King Mongkut's Institute of Technology Ladkrabang; Mahidol University
    This paper describes the design of a CMOS analog discrete-time equalizer for perpendicular magnetic recording (PMR) read channel. In this design the structure of analog FIR filter that places rotating switch matrix between DAC and multiplier has been proposed. It reduces an accumulative switching error in analog samples due to rotating switch matrix. A 7-tap filter circuit based on GPR2 target was designed and simulated using TSMC 0.18 μm CMOS process parameters. Simulation results show good agreement with the results of the system level simulation. At 1 GHz sampling frequency the equalizer dissipates 1.5 mW. ©2010 IEEE.
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    Temperature independent log domain filter
    (2013-12-31) Surachoke Thanapitak; Phumin Kirawanich; Decha Wilairat; Pongsathorn Sedtheethorn; Mahidol University
    This paper presents the current mode log domain filter based on the Bernoulli cell which has moderately low sensitivity to temperature change. According to the simulation results in a standard 0.18μm CMOS process, the sensitivity of the output current over temperature of this log domain circuit is 2.941pA/°C. This is archived by using the modified current reference circuit which is directly proportion to temperature as the bias current for the log domain filter circuit. Additionally, this modified current reference circuit can be operated at low power supply voltage (1.11V) while high PSSR (0.43nA/V) is maintained. The power consumption of this modified current reference is in the sub-microwatt range (0.1μW). © 2013 IEEE.