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Author: search.filters.author.Thanachayanont, A.Subject: search.filters.subject.CMOS technology

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    ±1.5V high performance CMOS rail to rail voltage follower
    (2002-01-01)
    Kasemsuwan, V.
    ;
    Boonyaporn, P.
    ;
    Thanachayanont, A.
    A ±1.5 V high performance CMOS rail to rail voltage follower is presented. The circuit is based on the symmetrical class AB voltage follower and can operate under supply voltages of 1.5 V. The proposed circuit has power dissipation of 5.2 mW under quiescent condition and can drive ±1.25 V to 250 Ω load with a total harmonic distortion of less than 0.5 percent and cut-off frequency of 237 MHz. Although simple, the proposed circuit enables the output transistors to drive the load efficiently.
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    100-MHz CMOS direct digital synthesizer with 10-bit DAC
    (2002-01-01)
    Meenakarn, C.
    ;
    Thanachayanont, A.
    This paper describes the design and implementation of an integrated direct digital synthesizer with a 10-bit on-chip digital-to-analog converter using a 0.5-μm CMOS technology. The DDS chip operates at 100-MHz maximum clock frequency under 3.3-V supply voltage, with 32-bit frequency, 12-bit phase and 10-bit amplitude resolution. The chip provides sinusoidal, sawtooth, ramp, square and random waveforms with phase and frequency modulation, and power-down function, occupies 12-mm<sup>2</sup> die area, and dissipates 0.4 W at 100-MHz clock rate. At 25-MHz sinusoidal output, the measured worst-case spurious noise is -65 dBc and the phase noise is -119 dBc/Hz at 100-kHz frequency offset.