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User: singhpralhad18

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Posts by singhpralhad18

<prev • 19 results • page 1 of 2 • next >
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Answer: A: Explain working of peak detector.
... ![enter image description here][1] [1]: https://i.imgur.com/FYYjCwU.png 1.Rectifier circuit gives average value of input signal; but in practice we need peak value of input signal. This is achieved by peak detector circuit. The following figure shows a simple peak detector circuit using diode a ...
written 4 months ago by singhpralhad180
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Answer: A: Explain the functional block diagram of Timer IC555
... ![enter image description here][1] [1]: https://i.imgur.com/W7p26LI.gif Now as shown in figure, there are eight pins for a 555 Timer IC namely, 1.Ground. 2.Trigger. 3.Output. 4.Reset. 5.Control 6.Threshold. 7.Discharge 8.Power or Vcc Pin 1. Ground: This pin has no special function wh ...
written 4 months ago by singhpralhad180
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Answer: A: Explain counter type ADC with neat diagram.
... ![enter image description here][1] [1]: https://i.imgur.com/3XshSLx.png The input to an A to D converter is the analog voltage and output is n it digital word. In counter A to D converter , DAC’s input code is adjusted until DAC’s output comes with ±(1/2) LSB to the analog input which is to be c ...
written 4 months ago by singhpralhad180
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Answer: A: Automatic Gain Control (AGC)
... 1.Automatic gain control (AGC) is a mechanism wherein the overall gain of the radio receiver is automatically varied according to the changing strength of the received signal. This is done to maintain the output at a constant level. 2.Automatic gain control (AGC) is a mechanism wherein the overall ...
written 5 months ago by singhpralhad180
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Answer: A: Pre-emphasis and de-emphasis
... **Pre-emphasis**: The noise suppression ability of FM decreases with the increase in the frequencies. Thus increasing the relative strength or amplitude of the high frequency components of the message signal before modulation is termed as Pre-emphasis. The Fig3 below shows the circuit of pre-emphasi ...
written 5 months ago by singhpralhad180
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Answer: A: Pre-emphasis and de-emphasis
... **Pre-emphasis**: The noise suppression ability of FM decreases with the increase in the frequencies. Thus increasing the relative strength or amplitude of the high frequency components of the message signal before modulation is termed as Pre-emphasis. The Fig3 below shows the circuit of pre-emphasi ...
written 5 months ago by singhpralhad180
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Answer: A: What is need of modulation?
... **Need for modulation**: The baseband signals can be transmitted directly, but the baseband transmission has many limitations which can be overcome using modulation. In the process of modulation, the baseband signal is translated i.e. shifted from low frequency to high frequency. This frequency s ...
written 5 months ago by singhpralhad180
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Answer: A: Explain ISB transmission.
... 1.Independent Sideband (ISB) is an amplitude modulated technique in which a single carrier frequency is independently modulated by two different modulating signals. 2.In other words, ISB is a form of double sideband transmission system in which the transmitter comprises of two independent single si ...
written 5 months ago by singhpralhad180
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Answer: A: Explain in detail about frequency multiplier and application of PLL.
... The output from PLL system can be obtained either as the voltage signal vO(t) corresponding to the error voltage in the feedback loop, or as a frequency signal at VCO output terminal. The Voltage output is used in frequency discriminator application whereas the frequency output is used in signal con ...
written 6 months ago by singhpralhad180
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Answer: A: Write short note on vestigial side-band transmission.
... VSB 1.The stringent frequency response requirement 0n the side band filter in SSB-SC system can be relaxed by allowing a part of the unwanted sideband called as Vestige to appear in the output of the modulator 2.Due to this the design of this sideband filter is simplified to a great extent. But th ...
written 6 months ago by singhpralhad180

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