How can sensitivity achieved on an IF amplifier stage of a heterodyne receiver?
A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the… sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing.. There is also the method of the Variable Tuned Filter.
These are the 3 criteria in choosing a good receiver. Sensitivity refers to the ability of the receiver to receive very weak signal. Selectivity to select the desired frequenc…y and reject the others. lastly, Fidelity to produce good quality of signal without distortion.
No, because in a pure amplifier the radio part is always missing.
Depends on what your definition of "receiver" is, but most of the time - to the amplifier. Consider: if the receiver is some form of a device that receives some signal, …and then decodes it to audio, then the receiver will hook into the amplifier, which in turn will drive the speakers (so the speakers go to the amplifier) if, on the other hand, the receiver is a part of a wireless connection between the amplifier and speaker, then it really serves the role of a cable, so in essence you're again connecting the speakers to an amplifier (only using the receiver as an intermediary) You would have to specify your case.
A simple, 1 transistor single stage amplifier can be made using several resistors to bias a NPN or PNP transistor into its' linear operating region. With this done, a small vo…ltage signal applied to the input of the amplifier will have the voltage amplified at the output in a linear fashion. I'm not sure what your question is; if this does not answer it let me know.
When two frequencies are "mixed" the sum and the difference frequencies are produced. These frequencies are called heterodynes. If these frequencies are outside the range of h…uman hearing they are said to be supersonic. The full name of a superhet receiver is supersonic heterodyne. This receiver uses a mixer to produce an intermediate frequency outside the range of human hearing. Before superhets were in common use, but following from the old crystal set was an amplified form of the crystal set, called the 'Tuned Radio Frequency" receiver, or "TRF" for short. With many TRF receivers, a control called 'regeneration' controlled the gain of the RF amplifier, and could be turned up to the point that the entire radio set became unstable and oscillated, usually at the frequency you were tuned to. With the gain set just below the point of oscillation, these receivers were very sensitive. For listening to morse code signals, the control would be advanced just into the oscillation stage, and the difference in frequency between the received signal and the receiver's oscillation became a 'beat note', or a beeping sound, that was easy to receive in noisy conditions. This form of reception became known as 'heterodyne reception', and this type of radio was called a 'regenerative receiver'. Problem was, this operation usually required 3 hands, a still room and a lot of patience. Once tuned, the radio would drift in frequency, or burst into loud screaming oscillation, seemingly for no apparent reason. Sometime later, the 'super-regenerative' receiver was developed in an effort to simplify operation and these were used up into VHF frequencies into the early '30's. Eventually, with the development of better radio tubes and more elaborate design, the suphet rapidly became the most popular, as it was so easy to use. At last, you only needed one hand to operate a radio. And you could walk away and come back and it was still tuned to the station. This was the '30's where radios found their way into every westerner's living room, bringing news and entertainment to the masses (that could afford it). By the 60's, we all had 'transistors', and the superhet was everywhere. Now, most of us have TV, cable or satellite. And you know which process they all still use to turn the RF signal into a video signal that the screen can display? Just testing!
its a radio! :D
single stage amplifier contain only one stage transistor amplifier but multi stage contain more than one amplifier stage
A: Feedback is a signal fed back from the output like from collector to the base .
[1/(1+Ab)] is the expression for sensitivity...
In a two stage amplifier the gain (ratio of the output to the input quantity) of the first stage is amplified again in the second stage so the gain of a two stage amp is the p…roduct of the gain of two individual stages which is sufficient enough to drive the output device as compared to a single stage amplifier.
An 'amplifier' usually refers to an audio amplifier for a HiFi stereo system. (Although amplifiers are used in other devices, such as Radio transmitters, and is an electronic …device for making a signal bigger.) A stereo amplifier usually has inputs for various signal sources, such as phono, microphone, tuner, aux etc. It has outputs for speakers. It takes a small input signal and boosts it to drive a loudspeaker and has controls to select the input and alter the volume and tone. A receiver, generally refers to a dedicated radio receiver. It may have a choice of wavebands and a display to show what it is receiving. A receiver is a complete unit which has it's own loudspeakers or can drive external loudspeakers. A 'Tuner', on the other hand, is a radio receiver without it's own audio amplifier. The 'Tuner' is used as an input source for the amplifier. The amplifier may have a Tuner input, or you can use the 'Aux' input.
Resistors are used in the single stage amplifier to bias the transistor for proper operation.
A multistage amplifier is composed of several single stage amplifiers.