i Acknowledgments ii List of original papers v

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external amplifier was able to detect the sound waves from microphone on speaker and oscilloscope. The maximum amplitude of output speech signal of amplifier is 45 mV, and the maximum output of MEMS microphone is 1.125 µV.

We describe electronic instruments for creation of effective Cooper pair spectroscopy. The suggested spectroscopy requires study electric field effects on the surface cleaved superconductors. instrument reacquires low noise amplifier with 10$^6$ amplitude amplification which we have formerly used Johnson-Nyquist and Schottky noises. nonspecific is followed by high-Q tunable resonance filter bas...

This article proposed a simple self cascode RGC amplifier configuration to increase the gain and bandwidth. The cascode amplifier eliminates the miller capacitance between input and output and facilitates high gain, high input and output impedance with high bandwidth. However, the cascode amplifier requires relatively high supply voltage for proper operation and it decreases the output voltage ...

In this paper, the design of linear amplifiers for current sources with very low, or voltage sources with very high impedance is discussed. In designing negative-feedback amplifiers for these sources, the loopgain is often low as a result of the source impedance, thus making it difficult to obtain a sufficiently high bandwidth. Here, it is proposed to use CB or CC stages in front of a negative-...