Howtosignalprocessing
- How does a square law detector work?
- Why detector is required to have a square law response?
- Which diode is the square law detector?
- What is a square law device?
How does a square law detector work?
Working Operation
In every positive half cycle of the input, the demodulator diode is forward biased and charge the filter capacitor C connected across the load resistance R to almost the peak value of the input voltage. As soon as the capacitor charges to the peak value, the diode stop conducting .
Why detector is required to have a square law response?
The square law detector circuit is used for detecting modulated signal of small magnitude so that the operating region may be restricted to the non-linear portion of the V-I Characteristics of the device.
Which diode is the square law detector?
Schottky diode detectors are used to detect small signals close to the noise level and to monitor large signals well above the noise. From the noise level up to about -20 dBm (Figure 1) the slope of the response curves is constant. This is the square law region.
What is a square law device?
(1) A square law device is one that produces an output voltage or current that is proportional to the square of its input voltage or current. Square law devices are mainly used in modulators and detectors. Example: The detector diode used in communication systems, FETs used in balanced modulator etc.
