A broken number frequency division synthesizer

Abstract

The decimal-frequency-division frequency synthesizer comprises: a first control circuit to control a pulse correction circuit, and a second control circuit that includes a constant register and a comparator and connects with the first one and pulse correction circuit by inlet and outlet respectively. With less phase noise and more uniform pulse distribution, this invention outputs more precise instantaneous frequency.

Description

technical field [0001] The invention relates to a frequency synthesizer, in particular to a fractional frequency division frequency synthesizer. Background technique [0002] In various fields of modern electronics, signal sources with high precision and easily adjustable frequency are often required. Especially with the development of the communication industry, the distribution of channels is becoming more and more dense, requiring high-precision, high-stability communication frequencies. The requirements cannot be met with conventional signal generators. In order to solve this difficult problem, people propose the scheme of the frequency synthesizer. Frequency synthesis refers to the technology of generating a large number of discrete frequencies with the same stability and accuracy after a series of operations on a standard signal frequency with high precision and high stability. [0003] In many applications, the frequency synthesizer is required to have very high fr...

AI Technical Summary

Problems solved by technology

[0014] From the basic principle of fractional frequency division, it can be seen that when the fractional frequency divider performs m frequency division, the phase leads. When the advanced phase is accumulated to 2π, the phase lag compensation is performed by m+1 frequency division, so the output pulse formed The maximum time skew that may be caused is a reference clock T μ , so the phase noise is large, and it is difficult to adapt to some technical fields that require high frequency resolution

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