A notch filter based frequency-difference detector and its applications

Author

Kwan, Tom ; Martin, Ken

Author_Institution

Integrated Circuits & Syst. Lab., California Univ., Los Angeles, CA, USA

fYear

1990

fDate

1-3 May 1990

Firstpage

1343

Abstract

A new frequency-difference detector (FDD) based on an adaptive notch filter is proposed. The FDD is useful in decreasing acquisition times in phase-locked loop (PLL) and Costas loop based clock and carrier extraction systems. When used to aid voltage controlled oscillator (VCO) locking in a PLL, the new FDD eliminates phase errors between the input signal and the VCO output when in lock, even when a multiplying-type phase detector is used (as opposed to an edge-sensitive phase detector). This decreases jitter for low-SNR applications. Also, the control-voltage output from the FDD has substantially less ripple for a given loop bandwidth, as compared to a traditional FDD such as the quadricorrelator (QDR). This also significantly decreases the phase jitter of extracted signals

Keywords

active filters; adaptive filters; detector circuits; discriminators; notch filters; phase-locked loops; Costas loop; VCO locking; acquisition; adaptive notch filter; carrier extraction systems; clock extraction; control-voltage output; edge-sensitive phase detector; frequency-difference detector; low-SNR applications; multiplying-type phase detector; phase errors; phase jitter reduction; phase-locked loop; voltage controlled oscillator; Adaptive filters; Bandwidth; Clocks; Detectors; Error correction; Frequency; Jitter; Phase detection; Phase locked loops; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., IEEE International Symposium on

Conference_Location

New Orleans, LA

Type

conf

DOI

10.1109/ISCAS.1990.112379

Filename

112379