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Identify and complete given block diagram.State the function of identified blocks.

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Subject: Mobile Communication

Difficulty: Medium

Marks: 4 marks

1 Answer
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  • The above block diagram is – Frequency Synthesizer A- Low Pass Filter(LPF) B- Voltage controlled Oscillator(VCO) C- Frequency Divider D- Prescaler

  • Function of Identified Block-:Low Pass Filter(LPF)-A low-pass filter is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency

  • Voltage controlled Oscillator(VCO)-:The output of VCO-2 is used as a local oscillator frequency for the first mixer in the receiver.The outputs of the two VCOs are mixed together to produce the transmitter output frequency.

  • Frequency Divider-: Frequency dividers are used to generate a frequency that is a multiple of a reference frequency. These frequencies are then used for transmitters and receiver section The frequency divider block receives the divide by numbers from the logic section.

  • Prescaler-: A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division.The purpose of the prescaler is to allow the timer to be clocked at the rate a user desires.

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