Everything about Costas loop
Phase-locked loop-based demodulator circuit
A Costas loop is a phase-locked loop (PLL) based circuit which is used for carrier frequency recovery from suppressed-carrier modulation signals and phase modulation signals. It was invented by John P. Costas at General Electric in the 1950s. Its invention was described as having had "a profound effect on modern digital communications". The primary application of Costas loops is in wireless receivers. Its advantage over other PLL-based detectors is that at small deviations the Costas loop error voltage is as compared to. This translates to double the sensitivity and also makes the Costas loop uniquely suited for tracking Doppler-shifted carriers, especially in OFDM and GPS receivers. Wikipedia →
🧭 Start here: a 6-step reading path
- Read the overview: Costas loopA 5-minute orientation
- Skim a recent paper: Dual-Polarization Optical Costas Loop for DSP-Free Homodyne Short-Reach LinksInfluential work since 2022
- Pick up a classic book: American FilmThe most-reprinted book on the subject
- Read the landmark paper: Tutorial on dynamic analysis of the Costas loopCited 62 times
- Go sideways: Phase-locked loopA closely related topic
- Go sideways: Phase-locked loop rangeA closely related topic
📖 Definitions
No dictionary entry for this exact phrase.
🗂️ The subject at a glance
🏆 Landmark papers (most cited)
Tutorial on dynamic analysis of the Costas loop
Optimum Performance of Suppressed Carrier Receivers with Costas Loop Tracking
Improving Frequency Acquisition of a Costas Loop
40Gbit/s coherent optical receiver using a Costas loop
Costas Loop Experiments for a 10.6 µm Communications Receiver
PSK optical homodyne detection using external cavity laser diodes in Costas loop
Simulation of Analog Costas Loop Circuits
Costas loop analysis for coherent optical receivers
🆕 Influential since 2022
Dual-Polarization Optical Costas Loop for DSP-Free Homodyne Short-Reach Links
All Electrical Costas Loop for Carrier-Forwarded Analog Coherent DCI Receivers: System Integration, Characterization, and Measurements
Modified Costas Loop for Carrier Phase Tracking in GPS Receivers
Effective Lock Detectors Based on Costas Loop Output for SBPSK Mobile Communications
Necessary Condition for the Costas Loop to Track Desired Signal Under CW Interference
📚 Books worth reading
American FilmAmerican Film Institute · 1975
Military and naval recognition bookJoel William Bunkley · 1917
The Conspirators HierarchyJohn Coleman · 1992
Flexible robot manipulatorsM. O. Tokhi, A. K. M. Azad · 2008
Costas LoopsRoland Best · 2017- 📕Carrier acquisition & tracking/costas loop/autom freq CNT(ESA TT-838).
- 📕Investigation of the performance of a Costas loop PSK demodulator in the presence of noiseF. Absolonne · 1975
- 📕O Brasil ainda se pensaAna Laura dos Reis Corrêa, Alexandre Pilati · 2012
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
- Phase-locked loop A phase-locked loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the…
- Phase-locked loop range The terms hold-in range, pull-in range (acquisition range), and lock-in range are widely used by engineers for the concepts of frequency deviation ranges…
- Phase detector characteristic A phase detector characteristic is a function of phase difference describing the output of the phase detector. For the analysis of Phase detector it is…
- Charge-pump phase-locked loop Charge-pump phase-locked loop (CP-PLL) is a modification of phase-locked loops with phase-frequency detectors and square waveform signals. A CP-PLL allows…
- Product detector A product detector, also known a VIC detector, is a type of demodulator used for AM and SSB signals. Rather than converting the envelope of the signal…
- Carrier recovery A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrier wave and…
- Phase detector A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a signal which represents the difference in…
- Voltage-controlled oscillator A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input. The applied input voltage…