What type of modulated signal will be generated using square law modulators?

Abstract: The ‘switching-modulator’ or the ‘square-law’ modulator can be used for generating amplitude modulation (AM/DSB), while the ‘ring-modulator’ or the balanced modulator can be used to generate double-side-band-suppressed-carrier (DSB-SC) in the laboratory.

What is the square law modulator?

Square law modulators are used for Amplitude Modulation. They have non linear current-voltage characteristics. Square law modulators are highly nonlinear in low voltage region.

What happens in case of square law modulator?

The only difference is that in the square law modulator, the diode is operated in a non-linear mode, whereas, in the switching modulator, the diode has to operate as an ideal switch. This signal V1(t) is applied as an input of diode.

What are the types of generation of AM signal?

AM generation involves mixing of a carrier and an information signal. In low level modulation, the message signal and carrier signal are modulated at low power levels and then amplified. The advantage of this technique is that a small audio amplifier is sufficient to amplify the message signal.

How AM waves are generated?

The modulating signal and carrier are connected in series with each other and their sum V1(t) is applied at the input of the non-linear device, such as diode, transistor etc. Hence, the square law modulator produces an AM wave .

How an AM signal is produced using a collector modulator?

The collector current pulses cause the tuned circuit to oscillate or ring at the desired output frequency. The tuned circuit, therefore, reproduces the negative portion of the carrier signal. The modulator is a linear power amplifier that takes the low level modulating signal and amplifies it to a high power level.

How does an AM modulator work?

This is called amplitude modulation or AM. Frequency of an input signal can also be changed. If this input signal is added to the pure carrier wave, it will thereby change the frequency of the carrier wave. In that way, users can use changes of frequency to carry speech information.

What is collector modulator?

The modulating signal is applied to the collector of the transistor and hence this circuit is called collector modulator It has RF amplifIer in class C mode, in which the amplifier conducts only for a portion of positive half cycle of input signal. Thus amplitude of current pulses through the transistor vary.