Balanced-modulator


Posted on Apr 30, 2012

When the carrier level is adequate to switch the cross-coupled pair of differential amplifiers, the modu· lation signal, which has been applied to the gate, will be switched at the carrier rate, between the collector loads. When switching occurs, it will result in the modulation being multiplied by a symmetrical switching function. If the modulation gate remains in the linear region, only the first harmonic will be present. To balance the MC1445 modulator, equal gain must be achieved in the two separate channels.


Balanced-modulator
Click here to download the full size of the above Circuit.

To remain in the linear region, the modulation input must be restricted to approximately 200 m V pk-pk. Because the gate bias point is sensitive to the amount of carrier suppression, a high-resolution, 10-tum potentiometer should be used.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Digital 5V Power Supply using L296
flashingLEDs
Solid State Power Controller
Laser Pointer Remote Control Circuit
Audio Stereo Amplifer
Secret of the Great Pyramid
Vibration sensing Voice FM radio transmitter circuit ND-2 TM-801A



Top