Design and manufacture of low-noise amplifiers for high-resolution semiconductor detectors for medical imaging systems

Background: Semiconductor detector is a device in which semiconductor materials, often silicon or germanium, are used to measure the effect of charged particles or photons. Semiconductor detectors have been widely used in recent decades, especially for detecting gamma rays in medical imaging systems. The output signal of this detector should be amplified to operate properly. The amplifier is the main factor for amplifying the detector output signal.Methods: The amplifier is one of the key components in the signal processing of detectors. From the economic point of view, it is necessary to first simulate the product with the software related to that product and obtain the desired outputs before making any product. Then, we are going to manufacture the product, so that the cost of the trial and error in the manufacture of the product Stayed away. The amplifier circuit is used in the input of two capacitors by connecting two capacitors in the form of a common base to remove the amplifier dc signal. It is used to amplify the signal from the high-speed operational amplifier, which is very useful for amplified the to high-signal. Bipolar transistors have been used to impedance matching. A 12V power supply is used to power transistors and amplifiers.Results: One of the most important characteristics of detectors is its energy resolution. Unlike gas detectors, the minimum ionization energy is about 30 electron volts. In semiconductor detectors, the minimum ionization energy is about 3 electron volts, which is about 10 times lower, which causes the resolution of the semiconductor detector to rise sharply. Designed amplifier, a high-speed designed to amplify the output signal from the detector to a level that is appropriate for other signal processing elements. This amplifier gain is 10 and its bandwidth is 35 MHz Its noise is very low and its power consumption is 15 mW. The power supply circuit is 12 volts.Conclusion: In medical imaging systems, we use high precision and low noise semiconductor detectors to extract a quality image. The output signal of these detectors is of a lower amplitude and should be strengthened to a proper degree. The amplifier shaping the form of pulse output of this detector. The amplifier reduces noise system the system and prevents pile-up signals. The high-speed amplifier reduces the system s dead time and increases the resolution of the system.

Design and manufacture of low-noise amplifiers for high-resolution semiconductor detectors for medical imaging systems Keywords:

amplifier , gain , noise , semiconductor detector , imaging