The working principle of both Photodiode and Phototransistor is same however, various factors differentiate the two. The major difference between photodiode and phototransistor is their current gain. In other words, we can say, a phototransistor produces more current as compared to the photodiode when exposed to the same amount of light energy. Another crucial difference between photodiode and phototransistor is that a normal PN junction diode is employed in a photodiode that produces an … [Read more...] about Difference Between Photodiode and Phototransistor
Difference Between Multiplexer (MUX) and Demultiplexer (DEMUX)
The major factor that differentiates multiplexer and demultiplexer is their ability to accept multiple input and single input respectively. The multiplexer also known as a MUX operates on several inputs but provide a single output. As against demultiplexer also known as DEMUX simply reverses the operation of MUX and operates on single input but transmits the data to multiple outputs. It is noteworthy here that multiplexer acts as data selector thus provide a single output from several inputs. … [Read more...] about Difference Between Multiplexer (MUX) and Demultiplexer (DEMUX)
Wheatstone Bridge
Definition: Wheatstone bridge is a type of dc bridge that is used for the measurement of unknown resistance. It is a series-parallel combination of 4 resistances that provides zero difference voltage at the balanced condition. The principle of null indication is the basis of working of Wheatstone bridge and thus provides high accuracy in measurements. It consists of four resistances, out of which 2 are known resistances, one is variable resistance that is used to balance the bridge and … [Read more...] about Wheatstone Bridge
Logic gates
Definition: Logic gates are basically electronic circuits that perform logical functions such as addition, subtraction, multiplication etc. For any digital system, it acts as an elemental building block and is able to make logical decisions. It performs logical functions in order to produce an output when two or more inputs are applied. Basically, the operation of logic gates is represented by algebraic expressions. To form a big logic network sometimes, the output of a gate is fed to the … [Read more...] about Logic gates
Amplifier in electronics
Definition: An electronic device that is used to boost the power level of an input signal is known as an amplifier. Amplifiers are basically used in wireless communication systems that include an analogue signal. It has the ability to provide an amplified or increased form of an applied input signal. It is noteworthy that BJT, JFET or MOSFET can be used as an amplifier. However, for amplification, the device must be in the appropriate region. In other words, proper biasing must be provided … [Read more...] about Amplifier in electronics
Single Tuned Amplifiers
Definition: Single Tuned Amplifiers are multistage amplifier circuit that employs a parallel tuned circuit as a load. However, the tuned circuit in each stage is required to be tuned to similar frequencies. A common emitter configuration amplifier can be used as a single tuned amplifier which includes the parallel tuned circuit. During wireless communication, the radio frequency stage requires a tuned voltage amplifier in order to select the desired carrier frequency and amplify the allowed … [Read more...] about Single Tuned Amplifiers
Tuned Amplifiers
Definition: Tuned amplifiers are used to for the amplification of a specific frequency signal or a narrowband frequency signal. Basically high frequency or radio frequency signals are amplified using tuned amplifiers. Tuning (i.e., selecting) of frequency is done by using a tuned or resonant circuit at the load. Sometimes during amplification of the signal, it is necessary to select the desired frequency range and reject others. Thus tuned amplifiers are employed in radio receivers. Need for … [Read more...] about Tuned Amplifiers
Peak Detector
Definition: Peak detector circuits are used to determine the peak (maximum) value of an input signal. It stores the peak value of input voltages for infinite time duration until it comes to reset condition. The peak detector circuit utilizes its property of following the highest value of an input signal and storing it. Rectifier circuits usually provide an output in proportion to the average value of the input. However, some application requires measurement of the peak value of the signal. … [Read more...] about Peak Detector
Vestigial Sideband (VSB) Modulation
Definition: Vestigial Sideband (VSB) modulation is a modulation technique which allows transmission of one sideband in addition with a part or vestige of the other. It is basically a compromise between DSB-SC and SSB modulation. VSB technique was introduced to overcome the drawbacks of SSB modulation. As SSB modulation requires accurate frequency response of the filter to transmit only one sideband completely. Thus by using VSB modulation one can simplify the design of the filter to a … [Read more...] about Vestigial Sideband (VSB) Modulation
Single Sideband (SSB) Modulation
Definition: Single sideband modulation (SSB) is an amplitude modulation scheme in which only a single sideband is transmitted through the channel. It is also known as SSB-SC which is an acronym for Single Sideband Suppressed Carrier as it allows suppression of one sideband and carrier completely. As we know, DSB-SC modulation technique generates an output wave having twice the bandwidth as that of the original modulating signal. So, in order to avoid doubling factor of bandwidth in such … [Read more...] about Single Sideband (SSB) Modulation