Dual programmable subtraction frequency divider

A frequency divider and subtraction technology, applied in the field of microelectronics, can solve the problems of increased circuit complexity and power consumption
CN102412836BInactive Publication Date: 2013-03-27HANGZHOU DIANZI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU DIANZI UNIV
Publication Date
2013-03-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a dual programmable subtraction frequency divider. The existing frequency divider circuit has great complexity and high power consumption. The dual programmable subtraction frequency divider comprises a presettable 1 subtracted counter, a logic comparator and two registers. The presettable 1 subtracted counter comprises N (N is not less than 3) stages of presettable T triggers and M (M=N-2) stages of AND gates; the logic comparator comprises N stages of XOR gates and one NOR gate; an input end of the first register is connected with a first external preset number, and the input end of the second register is connected with a second external preset number; and an output port of the logic comparator is used as the output end of the dual programmable subtraction frequency divider. The frequency dividing ratio of the dual programmable subtraction frequency divider is controlled by two input frequency dividing preset numbers, circuits are implemented simply, and the programmable flexibility of the frequency dividing ratio is high.
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Description

technical field

[0001] The invention belongs to the technical field of microelectronics and relates to a double programmable subtraction frequency divider. Background technique

[0002] A frequency synthesizer is a component that realizes frequency conversion and channel selection in a wireless receiver, and a multimode frequency divider is a key module in a frequency synthesizer. With the continuous development of communication technology, multi-mode and multi-frequency has become the development trend of receivers. To realize a multi-mode multi-frequency receiver, the multi-mode frequency divider in the phase-locked loop must be flexible and programmable. On the other hand, in some special applications, such as fractional frequency division phase-locked loops, the frequency division ratio of the multimode frequency divider is controlled by two signals, one signal controls the integer frequency division, and the other signal is the sigma-delta modulator The transient outp...

Claims

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