Quadrature detector

1. What is quadrature detector?
2. How does a quadrature demodulator work?
3. What are the types of AM detectors?
4. What is quadrature radio?

What is quadrature detector?

The quadrature detector is probably the single most widely used FM demodulator. It uses a phase-shift circuit to produce a phase shift of 90° at the unmodulated carrier frequency. This detector is primarily used in TV demodulation and is used in some FM radio stations.

How does a quadrature demodulator work?

Quadrature demodulation uses two reference signals separated by 90° of phase, along with two multipliers and two low-pass filters, to generate I and Q demodulated waveforms.

What are the types of AM detectors?

There are two basic types of AM detector. An envelope detector uses rectification to produce a voltage proportional to the amplitude of the IF voltage. A “product” detector multiplies the IF signal by a reconstituted version of the carrier.

What is quadrature radio?

QAM (quadrature amplitude modulation) is a method of combining two amplitude modulation (AM) signals into a single channel. This approach helps double its effective bandwidth. QAM is also used with pulse AM (PAM) in digital systems, like wireless applications.