Frequency band select phase lock loop device

Details Frequency band select phase lock loop device Frequency band select phase lock loop device

1998-09-22

2000-07-18

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331 17, 331 36C, 331167, 331177V, H03L 7093, H03L 7099

Patent

active

060913045

ABSTRACT:
A multi-band phase lock loop (PLL) device for use in a communication system. The PLL comprises a frequency reference oscillator, a reference frequency divider, a phase and frequency detector, a filter and compensation circuit, a microcontroller, a multi-band voltage controlled oscillator (VCO), and a feedback divider. A fast feedback signal is provided to the VCO for phase locking operation. A slow feedback signal is used by the microcontroller to generate a frequency adjust signal for frequency band centering for the VCO. The microcontroller also controls the VCO to change the frequency band of operation. The PLL device may be used in a communication system that operate in both the cellular frequency band and the PCS frequency band.

REFERENCES:
patent: 5254958 (1993-10-01), Flach et al.
patent: 5686864 (1997-11-01), Martin et al.

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