Clocking scheme for a wireless communication device

Abstract

The invention relates to a method and a system for generating clock signals in a wireless communication device. The method includes generating an uncorrected reference clock signal, generating at least one frequency correction value corresponding to a frequency error in the uncorrected reference clock signal, and generating at least one radio frequency clock signal based on the uncorrected clock signal and the at least one frequency correction value, for receiving and transmitting radio frequency signals. The method further comprise generating, independently of the at least one radio frequency clock signal, a baseband timing signal based on the uncorrected reference clock signal and the at least one frequency correction value, for clocking baseband signal processing circuits.

Description

Technical field [0001] The present invention generally relates to the field of communications, and more specifically, to a method and system for generating and distributing clock signals in wireless communication devices. Background technique [0002] Modern wireless communication devices such as mobile phones require at least one clock operating at a stable reference frequency to operate correctly. A stable reference frequency is generally obtained by using a free-running crystal oscillator as the reference clock. However, modern mobile terminals have strict frequency stability requirements. These requirements cannot be achieved by using only free-running crystal oscillators due to the limiting factors that can cause frequency changes and / or frequency drift due to temperature dependence, supply voltage changes, and aging effects. achieve. [0003] In order to achieve a more stable reference frequency, an automatic frequency control (AFC) mechanism can be used. The AFC estimates...

AI Technical Summary

Problems solved by technology

These changes, even though they are relatively minor, can break or degrade the performance of some functions that require a continuous and stable reference clock

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