Chi-Hsiung Wang

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Ultralow-power devices have become popular in recent years because of their use in a number of applications, such as medical devices and communications. For ultralow-power consideration, the crucial factors in SRAMs are stability and reliability. A number of researchers considered various configurations of bit-cells for SRAMs for subthreshold operations,(More)
This paper presents a 4 MHz current control ring oscillator with a new temperature and supply voltage immune current reference implemented by 0.35nm CMOS technology. Compared to the conventional oscillator with current reference techniques, the proposed approach shows a significant improvement for the sensitivities of temperature and supply voltage. The(More)
In this paper, we analyze the circuit characteristic of static CMOS logics and provide the size ratio of PMOS to NMOS transistors under process, voltage and temperature (PVT) variations in UMC 0.18 μm CMOS process. The threshold voltage of a MOS transistor is influenced seriously under PVT variations with different channel length setting. The(More)
This paper describes a circuit, which generates a low temperature-dependent bias currents. In this paper, low temperature coefficient reference is presented. The circuit is firstly employed to generate a current reference with temperature compensation, then, supply current to the current controlled ring oscillator (CCO). Because of the oscillation frequency(More)
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