Oscillators – Frequency stabilization
Patent
1998-07-24
2000-09-19
Kinkead, Arnold
Oscillators
Frequency stabilization
331 34, 331 74, 331DIG2, 331 1R, 331177R, H03B 500, H03L 300
Patent
active
061218499
ABSTRACT:
An integrated circuit (11) has a frequency detection circuit (22) which provides one or more digital signals (50) to a current source (26) based upon a detected frequency of operation of a generated reference clock (48). The signals (50) allows the current source (26) to change its operational state between two or more discrete current output levels in a digitally-controlled manner. Using signals (50), a high current output level can selected and provided by the current source (26) to the external oscillator circuit (16) during a start up mode to ensure that the integrated circuit (11) can start up in an optimally reduced time period. After a start up operation is complete, the signals (50) can then be used to switch the current source (26) into a lower current operational mode whereby electromagnetic interference (EMI) effects are reduced during the normal modes of operation occurring after start up.
REFERENCES:
patent: 4896122 (1990-01-01), Tahernia et al.
patent: 4956618 (1990-09-01), Ulmer
patent: 5481228 (1996-01-01), Badyal
patent: 5852387 (1998-12-01), Brakus et al.
patent: 5912593 (1999-06-01), Susak et al.
Kochman Boaz
McCollough Kelvin Edward
Kinkead Arnold
Motorola Inc.
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