Robert J Sarocka

US Patent:

54989981, Mar 12, 1996

Filed:

Nov 16, 1992

Appl. No.:

7/976768

Inventors:

James K. Gehrke - Lake in the Hills IL
Robert J. Sarocka - Lombard IL

International Classification:

H04B 140
H03L 700

US Classification:

331 17

Abstract:

Adjustment of the output frequency of a frequency synthesizer can be optimized in the following manner. Once a frequency adjustment request is detected, which indicates a selected frequency, a frequency difference is calculated between the selected frequency and the present frequency. A frequency scaling factor is then determined. Once the frequency difference and the frequency scaling factor are determined, a frequency adjustment time is calculated based on a proportional relationship between the frequency difference and the frequency scaling factor. The bandwidth of a multi-bandwidth filter is adjusted to a second bandwidth for the duration of the calculated frequency adjustment time. The output frequency of the frequency synthesizer is adjusted from the present frequency to the selected frequency prior to the expiration of the frequency adjustment time. Upon expiration of the frequency adjustment time, the bandwidth of the multi-bandwidth filter is adjusted from the second bandwidth to the first bandwidth.

US Patent:

52574091, Oct 26, 1993

Filed:

Oct 18, 1991

Appl. No.:

7/779553

Inventors:

Robert J. Sarocka - Lombard IL
David D. Neperud - Roselle IL
Peter P. Walter - Schaumburg IL
Tim J. Manczko - Hanover Park IL
David H. Spensley - West Chicago IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 140

US Classification:

455 76

Abstract:

This disclosure discusses a programmable frequency synthesizer arrangement having programming feedback capability used to avoid undesirable operation due to random hard and soft faults. The arrangement operates by supplying appropriate programming information, receiving the same, subject to random hard or soft faults, and, in response, directing the operation of a frequency synthesizer (10). The feedback capability is accomplished by generating a feedback signal (35, 36) indicative of the programming information as applied to the frequency synthesizer, generating a reference signal representative of the appropriate programming information, comparing the two signals, and blocking undesirable operation of the frequency synthesizer if the comparison indicates the occurrence of a random hard or soft fault. Further disclosed is a wireless communications transceiver with the programmable frequency synthesizer arrangement.