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Contents

Analog Communication

Amplitude Modulation

Amplitude Modulation Basics AM Frequency Spectrum AM Power Relations AM DSB-FC AM DSB-SC AM SSB VSB Modulation AM Modulators AM Demodulators Costas Loop

Frequency Modulation

FM Basics Bessel Functions in FM Carson's Rule PM Basics Narrowband FM Indirect FM Generation Direct FM Generation FM Demodulation Basics Foster-Seeley Discriminator Ratio Detector PLL Demodulator Pre-emphasis and De-emphasis Stereo FM

Noise Analysis

Noise Taxonomy Thermal Noise White Noise Signal to Noise Ratio Noise Figure Friis Formula Equivalent Noise Temperature Noise in AM Systems Noise in FM Systems FM Threshold Extension

Receiver Architectures

Receiver Parameters TRF Receiver Superheterodyne Receiver Image Frequency Rejection Double Conversion Direct Conversion Receiver Automatic Gain Control Tracking and Alignment

Pulse Modulation

Sampling Theorem Natural vs Flat Top Sampling PAM PWM PPM PCM Basics Quantization Noise Companding Delta Modulation Adaptive Delta Modulation DPCM

Analog vs Digital

Analog vs Digital Comm Hybrid Systems Applications Transition to Digital

Other Topics

Communication Channels Link Budget FDM TDM Television Basics

Other Subjects

Analog Electronics Digital Electronics Signals & Systems Control Systems Electromagnetic Theory Digital Communication Network Analysis Microprocessors VLSI Design Verilog HDL Power Electronics Embedded Systems DSP Electronic Devices

Section Progress90%

9 of 10 articles

AM Demodulators

Envelope detector, synchronous detector.

Updated: 19 March 2026

11 min read

AM Demodulators Quiz

Test your knowledge of envelope detection, synchronous detection, and their performance trade-offs.

Question 1 of 3

Q1.An envelope detector consists of a diode, capacitor C, and load resistor R. The time constant RC must satisfy a specific condition relative to the message and carrier frequencies. Which condition correctly defines the RC design constraint?

Related Articles

PLL Demodulator

Phase Locked Loop as FM detector.

12 min read

AM Power Relations

Carrier power, sideband power, modulation efficiency.

10 min read

AM Frequency Spectrum

Carrier, upper and lower sidebands, bandwidth.

6 min read

Amplitude Modulation Basics

Definition, modulation index, time domain equation.

9 min read

AM DSB-FC

Double sideband full carrier, classic AM generation.

7 min read