Programmable multi-modulus frequency divider

A frequency divider and modulus technology, which is applied in the field of programmable multi-modulus frequency divider, can solve problems such as target pulse frequency errors, and achieve the effects of simplifying circuit design, expanding application range, and reducing complexity and cost

CN1604475AInactive Publication Date: 2005-04-06MEDIATEK INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2005-04-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

It is a programmable multi-module frequency divider, which is to divide one source impulse frequency to output the aim impulse according to multiple update divisor signals. The divider comprises at least one first frequency divider units crossing with each other and simultaneously repeats each operations of the divider according to a repeat signal to trigger the loaded update divisor signal operation according to the repeat signals.
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Description

technical field

[0001] The invention relates to a frequency divider, in particular to a programmable multi-modulus frequency divider. Background technique

[0002] The frequency division circuit is a very important part of the frequency synthesizer. It is used to divide an original pulse into a target pulse, and the frequency of the target pulse is the result of dividing the frequency of the original pulse by a divisor value. As is well known to those skilled in the art, a general frequency divider circuit (Frequency Divider) is composed of multiple dual-mode frequency division units connected in series (Cascade), and each frequency division unit is based on a corresponding divisor signal , to select the frequency division mode to be performed. The divisor value range that the frequency divider can handle is limited by the number of the frequency division units. The more the frequency divider units are, the greater the divisor value range that the frequency divider can ope...

Examples

Embodiment Construction

[0055] Please refer to figure 1 . figure 1 It is a schematic diagram of the first embodiment of the programmable multi-modulus frequency divider of the present invention. A programmable multi-modulus frequency divider 100 includes N frequency division units 10 connected in series, wherein each frequency division unit 10 has a first input terminal (Fi), a second input terminal (Mi), a A third input terminal (Di), a fourth input terminal (Rs), a first output terminal (Fo), and a second output terminal (Mo). exist figure 1 Each of the frequency division units 10 is defined as the first stage, the second stage, .

[0056] Such as figure 1 As shown, in the first embodiment of the present invention, each frequency division unit 10 in the first to N-1th stages of the programmable multi-modulus frequency divider 100, its first output terminal (Fo) is coupled to It is connected to the first input terminal (Fi) of the next-level frequency division unit 10 , and its second input ter...