Multi-mode frequency divider based on modularization

Abstract

The invention discloses a multi-mode frequency divider based on modularization. The multi-mode frequency divider comprises a multistage frequency division structure, a circuit module for expanding a frequency division range and an input digital control bit module. The multistage frequency division structure is formed by a plurality of divided-by-2 / divided-by-3 frequency division units with the same logic structure, is in series connection with the circuit module for expanding the frequency division range and interacts with logic high and low levels generated by the input digital control bit module to achieve the wide frequency division range. The multi-mode frequency divider based on modularization is formed by cascade connection of the divided-by-2 / divided-by-3 frequency division units with the same logic structure, is simple in structure and is characterized by being modularized; and frequency is reduced along with every stage of unit, and power consumption optimization is facilitated.

Description

technical field [0001] The invention relates to the technical field of frequency dividers, in particular to a multimode frequency divider based on module frequency division range expansion. Background technique [0002] Existing multi-mode frequency dividers are usually divided into two types: frequency dividers based on dual-mode prescaler technology and frequency dividers based on divide-by-2 / divide-by-3 unit cascade technology. [0003] The frequency divider based on dual-mode prescaler technology is generally composed of M / M+1 dual-mode prescaler (M is the nth power of 2, and n is a positive integer), programmable counter P and swallow pulse counter S In the configuration, P>S is required in the two counters, and the function of the multi-mode frequency division ratio is realized through the values ​​of P and S. The frequency divider performs technology on (M+1)S pulses first, and then completes the counting work of (P-S)M input pulses, and finally obtains the freque...

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Problems solved by technology

[0005] The frequency divider based on the division by 2 / division by 3 frequency division unit cascading technology has the characteristics of modularization, and the frequency decreases with each level of units, which is conducive to the optimization of power consumption, and the adjustment method of the frequency division ratio is very simple, only need Convert the frequency division ratio to be realized into binary form, and then add the binary string to the corresponding digital control bit input of the frequency divider to achieve the required frequency division ratio; however, the frequency division range is very limited, and the maximum realized The frequency division ratio is about twice the minimum frequency division ratio, which is not suitable for wideband phase-locked loops

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