PLL frequency synthesizer with variable bandwidth loop filter

Details PLL frequency synthesizer with variable bandwidth loop filter PLL frequency synthesizer with variable bandwidth loop filter

1992-08-20

1993-12-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 331 25, H03L 7093, H03L 718

Patent

active

052724522

ABSTRACT:
A voltage controlled oscillator (VCO), a frequency divider, a phase detector, and a loop filter are connected to form a phase-locked loop. The input line of the loop filter is branched into two. One branch is connected to the ground through a first resistor, a second resistor and a capacitor which are connected in series. The other branch is connected between the second resistor and the capacitor through a switch and a bypass resistor which are connected in series. The connection point of the first resistor and second resistor are connected to the VCO as the output terminal of the loop filter. When the switch is off, the bandwidth of the loop filter is narrow, and when the switch is on, the bandwidth of the loop filter is broad.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4077015 (1978-02-01), Carson et al.
patent: 4752749 (1988-06-01), Moger
patent: 4774480 (1988-09-01), Sato et al.
patent: 5146187 (1992-09-01), Vandegraaf
patent: 5170130 (1992-12-01), Ichihara

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