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ASK Demodulation Simulation: Theory, Working & Waveforms


ASK Demodulation

Instructions for Amplitude Shift Keying Modulation (ASK)

  • Step 1: Click on 'Generate Message' button to generate input message signal
  • Step 2: Then click on 'Generate Carrier' button to generate carrier signal
  • Step 3: You can change the carrier signal frequency from the input field
  • Step 4: Click on 'Simulate ASK' button to generate Amplitude Shift Keying Signal

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Amplitude Shift Keying (ASK) Demodulation (Synchronous Demodulation)

ASK→Multiplier→LPF→Comparator→Data
Bit 1 / carrier present → multiplier produces a DC component → LPF keeps that DC component → high output. Bit 0 / carrier absent → multiplier produces no DC component → LPF output is low (approximately 0). The low-pass filter removes the high-frequency 2f_c component.

Amplitude Shift Keying (ASK) Demodulation (Asynchronous Demodulation / Envelope Detection)

ASK signal ==> Diode + RC ==> Envelope ==> Comparator ==> Data
Coherent Detection Block Diagram Input signal passes through a multiplier driven by a local oscillator, followed by a low pass filter and threshold comparator. Coherent Detection / Correlation Receiver S₁(t) = Ac cos(2ฯ€fct) S₂(t) = 0 V Multiplier × c(t) Local Oscillator c(t) = Ac cos(2ฯ€fct) V₁ LPF Removes 2fc V₂ Threshold Comparator Compare V₂ with Vth Vin > Vth ⇒ 1 Vin < Vth ⇒ 0 Threshold Vth = Ac² / 4 After multiplication S₁(t)c(t) = Ac² cos²(2ฯ€fct) LPF → Ac² / 2
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