Answer to question 1

Amplifier is referred to as an electromagnetic component rather an electronic device that enhances the level of power and boots an electric current (Khurshid & Khokhar, 2013). Amplifier possesses the ratio of input and output signal. Amplifier is capable to convert a wave to its corresponding fluctuating electronic current. In order to increase the voltage, current and power of a signal wireless communications and broadcasting amplifiers are used. Therefore, the amplifiers are used to maintain a balance between the input and the output signal. An amplifier is used to increase the amplitude of the waveform (Straullu et al., 2013). Three categories of amplifier are there such as voltage amplifier, current amplifier and power amplifier depending n the properties of the output signal. Radio frequency amplifier is used to convert a weak signal into powerful signal.  Additionally, it boosts up the radio messages before the transmission of the signal via antenna.  The range of frequency is generally determined by the users. One of the most frequently used radio amplifier is used to enhance the voice signal.

The radio frequency amplifiers are used to enhance the power level of the signals and it also simulates the frequency depending on the input signal. It is capable to enhance and decrease the level of frequency as per requirement (Liu et al., 2012). There is a particular spectrum and the radio frequency amplifier works on that particular range. The working ability of the amplifier increases the sensitivity of the receiver. In order to process radio signals different operational amplifiers re used. Generally, most of the mathematical and algorithmic operations are performed by the operational amplifiers. It is also used to enhance the frequency of the electronic signal ranging from 20 KHZ to 300 GHZ (Grassellino et al., 2013). The amplifiers are also used in different devices such as in hearing aids, loudspeakers and in audio and radio amplifiers.

Answer to question 2

Mixer is referred to as an electronic device that is used to multiply two signals. The multiplications also help to perform frequency conversion.  The utilization of single diode is almost similar to mixer (Wang et al., 2012). However, sometimes it becomes more complex while utilized in the performance improvement. The sum and the difference between frequencies can be obtained when, two sine waves beat against each other. Therefore, merging all this it can be said that, mixer is an electronic device that multiplies two different signals and also converts it (de Lamare, Hjorungnes & Sampaio-Neto, 2013). The technology is termed s mixer technology.

The equation for mixer wave conversion is a follows:  Sin(w1t) * sin(w2t)= ½ (cos [(w1-w2)t] – cos [(w1+w2)t]  

From the equation it can be stated that, superheterodyne and supetphate receiver architecture the mixer technology is referred to as a complicated phase of frequency chain signal. Over a wide band of interest the equation provides benefits (Ngo et al., 2012). Apart from this, it also provides the users a facility to handle, shift and modulate the sign as required.  The design of the architecture is complex though execution technology is easier. The sound mixture can be utilized in order to control the wave amplitudes and all the information that are carried out by the signal. The different resources of the sound waves can be placed in the two channels with the help of sound mixer (Straullu et al., 2015). The sound mixer controls all the proportion of the sign waves.

Basically two types of side bands are used in electronic study such as double side band and single side band. In order to use the transmitter power and band width single side band is used more efficiently. Single side band modulation is a form of amplitude modulation (Liu et al., 2012). SSB is being used by the users from a long time and it s considered as a more efficient term of communication during the comparison of ordinary modulation techniques. It is used in analogue television signals and in many other electronic practical applications. Double side band utilizes lower power consumption and the modulation system is very simple (Straullu et al., 2015). However, the detection technology is very complex in case of DSB-SC. Single side band (SSB) has a better frequency management spectrum capacity. Though the generation of SSB is quite complex than DSB.

 Answer to question 3

 (CDMA) Code division multiple access is referred to as a channel access method and it is used by various radio communication technologies (de Lamare, Hjorungnes & Sampaio-Neto, 2013). In CDMA more than one transmitter are used to send information. It also allows more than one users at a time to share a band o frequency. It is capable to convert analog signal to digital signal according to the requirement. The conversion is done with the help of spread spectrum technology.  The CDMA 2000 family of standards includes EV-DO Rev A and EV- DO Rev B (Ngo et al., 2012). Additionally, it is similar to other widely used cellular technologies that provide roaming facility. The width of CDMA channel is around 1.23 Mhz. The audio input is first digitized into the binary form and finally is converted in to predetermined pattern. FDMA (Frequency division multiplexing access) channel access technology is used in multiple access protocols as a centralized protocol. During the conversion the channel can be interrupted (Glisic & Leppänen, 2013).  It does not have any time related issue what TDMA has. For both digital and analog signals it can be utilized. FDMA is not termed as sensitive because, there is a presence of frequency filter. Multiple users can access the transmission system at a time. It serves the role of data access in the data link layer of a network based model. Khurshid and Khokhar, (2013) stated that, it operates on the media access control layer. The users can transfer or retrieve information in divided slots of frequency. However, the process is very costly and in the frequency domain users get separated one from other (Liu et al., 2012). The divided slots are allocated to different users and these channels are unique that means no unwanted user can access it.