4b_AM sperheterodyne receiver.pdf - Tutorial Supeheterodyne...

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Tutorial Supeheterodyne receiver RF Amp . Mixer IF Filter IF Amp . Detecto r VFO Synchronous. Oscillator. AF Amp out (required if coherent detection is used) automatic level control RF Block (RF Amp). This captures the desired radio statio carrier IF c RF f f f . Very High Frequency oscillator (VHO)/ Local oscillator. Its frequency output is set such that its output frequency IF c LO f f f i.e IF c LO f f f .( LO f must lie either above or below c f by IF f ). If the local collator output LO f is lower that the received RF f this called low-side injection ( f IF = f RF f LO) if the local oscillator is higher, then it is called high-side injection ( f IF = f LO f RF ). The Mixer: This where the heterodyning(multiplying) of the tuned in station’s signal IF c RF f f f and LO f . If Filter: Its basically a bandpass filter with passband equaling the m if IF f f f . IF ampliefier: provides the necessary gain.
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  • Spring '18
  • Frequency, Local oscillator, image frequency

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