![]() Graph of magnitude and phase of s11, s21, s12 and s22-parameters of BFG193 over the frequency range 500MHz - 1500MHz.īuilding the BJT Amplifier and Testing Its DC Bias Circuit You will use this transistor for the amplifier design of this tutorial lesson. The figures below shows the property dialog of the standard BJT model of BFG193 next to the property dialog of the RF BJT model of BFG193 measured at VCE = 10V and IC = 10mA. Most of RF.Spice's RF BJT devices also have counterpart standard BJT model that can be used for DC operating point analysis. ![]() RF.Spice A/D has a large number of RF bipolar junction transistor (BJT) models with measured S-parameter tables for different combinations of collector-emitter voltages (VCE) and collector currents (IC). The manufacturer data sheets of RF transistors usually contains tables of measured S-parameter data for various DC bias operating points over a certain range of frequencies. High frequency transistors are typically characterized by their S-parameters. Finally, you will run an AC frequency sweep analysis of the amplifier to characterize its voltage and gain performance.Ĭomparing High Frequency & Low Frequency BJT Models Then, you will calculate the port characteristics of the amplifier and verify its matching networks. First, you will examine the S-parameter model of the transistor and analyze its DC bias circuit. In this tutorial you will build an RF amplifier using a high frequency bipolar junction transistor (BJT) with lumped elements. 8 Running an AC Frequency Sweep Test of the BJT Amplifier.7 Running a Network Analysis of the BJT Amplifier.6 Designing Input and Output Matching Networks.5 Stability Analysis of the BJT Transistor & RF Design Strategy.4 Building the BJT Amplifier and Testing Its DC Bias Circuit.3 Examining the High Frequency BJT Model.2 Comparing High Frequency & Low Frequency BJT Models.The circuit diagram of a single stage IF amplifier is given below. here I shall discuss about about the IF amplifier that is used in AM Superhetrodyne Radio Receivers to amplify 455KHz IF signal. AM radio receivers uses 455KHz as intermediate frequency while FM receivers uses 10.7MHz as intermediate frequency the IF frequency of a radio receiver can be calculated by the following formula. IF or Intermediate frequency amplifier is a transformer coupled amplifier that is used in superhetrodyne radio receivers to amplify intermediate frequency. Now a days all radios and Television receivers use the principle of superhetrodyne.Īccording to superhetrodyne principle " The RF signal received by the antenna is mixed with a local oscillator signal and mixer produces a signal whose frequency is either the sum of RF signal and Local oscillator signal or the difference of RF signal and local oscillator signal and this signal given by the mixer is called Intermediate frequency also known as IF This is a principle that is used in communication engineering and this principle was invented by an American Engineer Edwin H. Intermediate frequency in AM Radio receivers is 455KHZ or 465KHz and In FM Radio receivers it is 10.7MHZ. Edwin Howard Armstrong(DecemFebruary 1, 1954) in1918. Superhetrodyne principle was discovered or invented by an American electrical Engineer Sir. Superhetrodyne Radio receivers uses the principle of superhetrodyne so they are known as superhetrodyne radio receivers. In superhetrodyne radio receivers, IF amplifiers are widely used. Here I shall discuss about Intermediate Frequency Amplifier only because explaining all the amplifiers given above is not possible here. Now you will surely familiar with all kinds of amplifiers used in Electronics. On the basis of number of used stages amplifiers are of three types. ![]() On the basis of Transistor configurations Amplifiers are of three types. ON THE BASIS OF TRANSISTOR CONFIGURATION: On the basis of position of operating point, amplifiers are of four types. LC ( Inductor Capacitor) coupled Amplifier.RC (Resistance Capacitor ) coupled amplifier. ![]() On the basis of coupling amplifiers are of four types. On the basis of frequency amplifiers are of 5 (five) types. Amplifiers can be classified on the basis of Frequency, operating point or class, Configuration, stage, coupling and power. Almost every analog electronic circuits consists at least one amplifier in order to amplify signals(voltage or current). The amplifier is a most popular and useful circuit in electronics and electrical engineering. So, Let's get Started!Īn amplifier is an electronic circuit or device that is used to amplify electrical signals (voltage and current). IF amplifiers are used in Superhetrodyne radio receivers to amplify inter mediate frequency or IF. In this instructables, I am going to make a two stages IF (Intermediate Frequency) Amplifier for MW(Medium Wave a) and SW(Short Wave) Receivers.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |