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In this paper we describe the design, implementation and performance of a low noise cascode amplifier. This amplifier is characterized in term of equivalent input voltage noise density and voltage gain at different drain currents upto a frequency of 80 MHz. The equivalent input voltage noise density of this amplifier is measured by two techniques. In the first technique, the output noise spectrum...
An improved tuning methodology of PID controller for standard second order plus time delay systems (SOPTD) is developed using the approach of Linear Quadratic Regulator (LQR) and pole placement technique to obtain the desired performance measures. The pole placement method together with LQR is ingeniously used for SOPTD systems where the time delay part is handled in the controller output equation...
A helical resonator coupled with a low noise amplifier is widely used for detection of trapped particles. Since the ion trap and amplifier load the resonator capacitively, it is required to estimate the resonant frequency of helical resonator under capacitive loading. In this paper, helical resonator with different values of capacitive loading is studied using HFSS software. A comparison is drawn...
Microwave ion source producing multi milliamperes of proton beam is currently operational at Variable Energy Cyclotron Centre. The main aim of this development is to understand and establish the key issues in high current beam generation, transport and its characterization for matching to a compact cyclotron. This ion source is excited through a 2.45 GHz magnetron. Its delivery system consists of...
This paper describes the application of Diophantine equation in auto tuned PID controllers. The method has been applied to a second order system with no zeroes. The plant transfer function is obtained by system identification toolbox of the MATLAB. The uniqueness of this approach is that the PID parameters can be found very quickly with less computational efforts. The proposed method has been validated...
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