Invention Grant
US09356769B2 Synchronous reset and phase detecting for interchain local oscillator (LO) divider phase alignment 有权
用于链路本地振荡器(LO)分频器相位对准的同步复位和相位检测

Synchronous reset and phase detecting for interchain local oscillator (LO) divider phase alignment
Abstract:
Certain aspects of the present invention provide methods and apparatus for synchronizing frequency-divided oscillating signals associated with multiple radio frequency (RF) paths to be in-phase. For certain aspects, a reset pulse is input to synchronization logic for a particular RF path, and this logic retimes the reset pulse to a local synthesizer clock in this RF path. The retimed reset pulse drives the reset input of a local frequency divider for this RF path and is also appropriately delayed, buffered, and then daisy-chained to the synchronization logic in the next RF path to be repeated therein. By appropriately resetting the local frequency dividers using the synchronization logic in this manner, the frequency-divided oscillating signals for the RF paths are synchronized to operate in-phase with one another.
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