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What is Costas Receiver in Quadrature Multiplexing about?
The Costas receiver is used for coherent demodulation of a DSB-SC input signal. It contains a phase shifter, two product modulators, two low-pass filters, and a phase discriminator. The goal is to synchronize the local oscillator phase to φ = 0 to maximize the demodulated signal and make it proportional to the message signal. The phase lock circuit compares the phase of the carrier signal to the local oscillator and adjusts the oscillator frequency temporarily if needed to maintain φ = 0.
- Author
- Aniket
- Language
- EN