ASK MODUATOR & DEMODULATOR CIRCUIT

 Understanding ASK Modulator and Demodulator Circuits: A Simplified Explanation:

Introduction:

Amplitude Shift Keying (ASK) is a popular modulation technique used in digital communication systems. In this blog, we will delve into the working principles of ASK modulator and demodulator circuits, explaining their functionality in a straightforward manner.

BLOCK DIAGRAM OF ASK MODULATION AND DEMODULATION :




ASK Modulator Circuit:

An ASK modulator circuit varies the amplitude of a carrier wave in accordance with the digital input signal.

Components required:-

1)Carrier wave generator.
2) Digital input signal source.
3)Multiplier or mixer  (Here a BJT transistor is used to generate ASK modulated signal).
4)Filter

Working:

1. The carrier wave generator produces a high-frequency carrier wave.
2. The digital input signal is applied to the multiplier, which varies the carrier wave's amplitude.
3. The filtered output is the modulated ASK signal.In an ASK (Amplitude Shift Keying) modulator circuit, a filter is used to shape the pulse of the modulated signal, limiting its bandwidth and ensuring the signal stays within the desired frequency range essentially, it controls the signal's spectral characteristics, preventing unwanted frequencies from being transmitted and optimizing the signal for efficient transmission and reception.

ASK Demodulator Circuit:

An ASK demodulator circuit extracts the original digital signal from the modulated ASK signal.

Components:

- Envelope detector
- Low-pass filter
- Comparator


Working:

1. The envelope detector extracts the envelope of the modulated ASK signal.
2. The low-pass filter removes high-frequency components.
3. The comparator converts the analog signal back to a digital output.

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