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In this paper, we present a VHF (Very High Frequency) band oscillator which mainly composed of a BJT active load differential amplifier (Diff. amp). We use H-spice PN to verify that the active load differential amplifier oscillator CMOS CMOS INV2 output frequency is 900 MHz at 2.0 volts power supply under v INV I CIC 0.18um-Si process. We also use discrete devices on bread board to prove the circuit is an oscillator circuit. Those experiments show such an oscillator can work stably + from 3.8 to 5.9 volts. Their output frequency will be 161.1 Q MHz, 186.7 MHz under 3.8 volts and 5.9 volts respectively. We use FFT (Fast Fourier Transform) diagram to analyse these oscillators and shows SNR (Signal-to-Noise Ratio) values. Finally, those experimental results reveal that the v oscillator is a nice voltage controlled oscillator (VCO) and also have good SNR characteristics.

In this paper, we present a VHF and UHF Statel or state2 will change into State3 and State3 will bands oscillator which mainly composed of a Bi-switch to State4. The next case is State4 changes back to CMOS active load differential amplifier (Diff. amp). State3. It will toggle itself between State3 and State4. We use H-spice and ADS to verify that the active load These continuous toggle phenomena cause oscillation. differential amplifier oscillator output frequency is 817.

Due to the rise of biological and MEMS technology in recent years, some micro flow system components have drawn attention and been developed by many investigators. The importance of micro-pumps manufactured is higher than the other part of micro flow system since it is the power source of the entire micro-flow system and responsible for driving working fluid in the microfluidic system. In actual operation, the instability and bad dynamic characteristics of the micro-pump will cause larger fluid flow mobility error, such as transport behavior and response procedures failure, etc., and even damage the microfluidic system. Therefore, to investigate the stability and dynamic characteristics of a micro pump is necessary. The Finite element analysis (FEA), ANSYS Workbench, is employed to analyze the dynamic characteristics of this micro pump, and experiment is also considered in this study.