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Power Amplitude Modulator CIRCUIT (MC3403D)

2015-03-18 20:29  
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This article describes the Power Amplitude Modulator CIRCUIT (MC3403D). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:MC3403D.

We can use L200 to send a signal onto a supply line. We can define Vo as Vo = Vref (1 R2/R1)? since the input signal Vi is DC decoupled.

Power Amplitude Modulator circuit schematic diagram

The gain of amplified signal is:

Gv= -R2/R1

This amplified signal is added to this component. We must impose i1 = i2 i3 (1) by ignoring the current entering pin 4.

Equation (1) becomes

i2= -i3 with i3 = Vi/R3 (for Xc<<R3)

Vo=R2 i2= -(Vi/R3).R2

since the voltage between pin 4 and ground remains fixed (Vref) as long the device is not in saturation, i1=0.

An application is shown in circuit diagram below. R1 should be replaced by a potentiometer if the DC level is to be varied but not the AC gain.


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