Author:
Ali Baran DURSUN
Year:
2019
Abstract:
Nowadays, an increasing number of applications use radio frequency (RF) for communication and require various RFICs (Radio Frequency Integrated Circuits) to meet the relevant needs. Since electronic products have widespread use, the environment has led to an increase in electromagnetic radiation; this increases the need for RFICs that offer improved communication reliability. RFICs offer high performance with low noise, low cost and high mobility in high-frequency domain circuits. RFICs generally use silicon-based technologies such as metal oxide semiconductors (MOS) and silicon-germanium for implementation (Si-Ge). However, RFICs should not be limited to silicon-based technologies; for example, Ga-As substrate which is a compound of Gallium and arsenic can also be classified as RFICs. Typical RFICs typically work with in-chip circuit elements. However, because of the high-quality factor in the chip, on-chip circuit elements can also be used. These lumped elements are effective when high quality factor is needed. In addition, the use of lumped elements can withstand high voltages. Lumped elements also allow going beyond the inductor values that foundry has given to the user. The integration technology has been reduced to millimeter range, this causes an obvious decrease in the designed circuit. The aim of the thesis is to create a novel design for filters on the market and reduce size in IC scale and make the bands are selectable. According to the literature research, a filter that operates at GSM bands; GSM 900 and GSM 1800 with selectable center frequency was not found. However, there are various papers including GSM band filters with dual center frequencies. By making the center frequency selectable, the novelty factor is provided to the specifications of the design. Also, no IC sized filter that is operating in the GSM bands had been found in the literature research. Hence, reducing the dimensions of the filter to the IC scale is adding value to the thesis. Reducing the dimensions to the IC scale also decreases the weight of the prototype. Decreasing the weight of the prototype allows to be more portable and makes it possible for the filters to be used in designs where even the smallest weight changes are crucial.