Modulation Index and Side bands

Modulation Index and Side bands Any modulation process produces side bands. When a constant-frequency sine wave modulates a carrier, two side frequencies are produced. The side frequencies are the sum and difference of the carrier and the modulating frequency. In FM and PM, as in AM, sum and difference side band frequencies are produced. In … Read more Modulation Index and Side bands

Balanced Modulator | Applications for 1496/1596 ICs

What is Balanced Modulator? A balanced modulator is a circuit that generates a DSB signal, suppressing the carrier and leaving only the sum and difference frequencies at the output. The output of a balanced modulator can be further processed by filters or phase-shifting circuitry to eliminate one of the sidebands, resulting in an SSB signal. … Read more Balanced Modulator | Applications for 1496/1596 ICs

Amplitude Demodulator | Diode | Crystal Radio | Synchronous Detection

What is Amplitude Demodulator Amplitude Demodulator, or detectors, are circuits that accept modulated signals and recover the original modulating information. The Amplitude demodulator circuit is the key circuit in any radio receiver. In fact, Amplitude demodulator circuits can be used alone as simple radio receivers. Diode Detectors The simplest and most widely used amplitude demodulator … Read more Amplitude Demodulator | Diode | Crystal Radio | Synchronous Detection

Amplitude Modulators | Low Level AM | High Level AM

What is Amplitude Modulators? Amplitude modulators are generally one of two types: low level or high level. Low-level modulators generate AM with small signals and thus must be amplified considerably if they are to be transmitted. High-level modulators produce AM at high power levels, usually in the final amplifier stage of a transmitter. Although the … Read more Amplitude Modulators | Low Level AM | High Level AM

Basic Principles of Amplitude Modulation

Principles of Amplitude Modulation Examining the basic equation for an AM signal, introduced in article 3, gives us several clues as to how AM can be generated. The equation is υAM = Vc sin 2πfc t + (Vm sin 2πfmt)(sin 2πfc t) where the first term is the sine wave carrier and second term is … Read more Basic Principles of Amplitude Modulation

Single Sideband (SSB) | Double Side Band Modulation

What is Single SideBand ? In amplitude modulation, two-thirds of the transmitted power is in the carrier, which itself conveys no information. The real information is contained within the side bands. One way to improve the efficiency of amplitude modulation is to suppress the carrier and eliminate one side band. The result is a single-sideband … Read more Single Sideband (SSB) | Double Side Band Modulation

Amplitude Modulation ( AM ) Power

Explanation of Amplitude Modulation Power? In radio transmission, the amplitude modulation signal is amplified by a power amplifier and fed to the antenna with a characteristic impedance that is ideally, but not necessarily, almost pure resistance. The AM signal is really a composite of several signal voltages, namely, the carrier and the two sidebands, and … Read more Amplitude Modulation ( AM ) Power

Sideband and the Frequency Domain

What is Sideband? Whenever a carrier is modulated by an information signal, new signals at different frequencies are generated as part of the process. These new frequencies, which are called side frequencies, or sidebands, occur in the frequency spectrum directly above and directly below the carrier frequency. More specifically, the side bands occur at frequencies … Read more Sideband and the Frequency Domain

Percentage of Modulation

How to Find Percentage Of Modulation The modulation index can be determined by measuring the actual values of the modulation voltage and the carrier voltage and computing the ratio. However, it is more common to compute the modulation index from measurements taken on the composite modulated wave itself. When the AM signal is displayed on … Read more Percentage of Modulation