Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1993-12-22
1995-06-13
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 1A, 331 10, 331 25, H03L 7093
Patent
active
054246890
ABSTRACT:
A phase lock loop (PLL) frequency synthesizer is used in a radiotelephone to provide a reference frequency to a transmitter or a receiver. This particular PLL frequency synthesizer has a wide bandwidth control loop having a high current charge pump (417) and a narrow bandwidth control loop having a low current charge pump (411). A deadzone circuit (413) is used at an output of a phase detector (405) to control the application of an error signal to the high current charge pump (417). Additionally, the PLL frequency synthesizer utilizes a loop filter (419). The loop filter (419) receives two correction signals (409', 415') and provides a single control signal for the VCO (voltage controlled oscillator) (423). The loop filter contains two time constants formed from resistive and capacitive elements. The two time constants control the bandwidth of the two control loops.
REFERENCES:
patent: 4167711 (1979-09-01), Smoot
patent: 4546330 (1985-10-01), Okada
patent: 4885553 (1989-12-01), Hietala et al.
patent: 5095288 (1992-03-01), Dent
patent: 5142246 (1992-08-01), Petersson
Gillig Steven F.
Hietala Alexander W.
Dailey Kirk W.
Grimm Siegfried H.
Motorola Inc.
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