A Multi-mode Programmable Frequency Divider

Abstract

Disclosed is a multimode programmable frequency divider, comprising: cascaded 2 / 3 frequency dividing units, a real-time power consumption control circuit, and a power switch control transistor, wherein the number of the frequency dividing units without a frequency dividing ratio extension bit and the number of the frequency dividing units with the extension digit are Ne and n-Ne, respectively; the real-time power consumption control circuit is composed of n-Ne-1 levels of two-input AND gates; the reverse signal of the frequency dividing ratio control bit of the n-th level of the frequency dividing unit is connected to the power control bit of the n-th level of the frequency dividing unit; the reverse signal, and the reverse signal of the frequency dividing ratio control bit of the (n-1)-th level of the frequency dividing unit are connected to the input end of the n-th level of the AND gate; the output end of the n-th level of the AND gate is connected to the power control bit of the (n-1)-th level of the frequency dividing unit, and the reverse signal of the frequency dividing ratio control bit of the (n-2)-th level of the frequency dividing unit is correspondingly connected to the input end of the (n-1)-th level of the AND gate; the subsequent connections are completed in a similar way until the reverse signal of the frequency dividing ratio control bit of the (n-Ne)-th level of the frequency dividing unit is connected to the input end of the (n-Ne-1)-th level of the AND gate; the drain of the power switch control transistor is connected to the power ends of the frequency dividing units with the extension bit, the source of the power switch control transistor is connected to a power supply, and the grid of the power switch control transistor is connected to the power control bits of the frequency dividing units with the extension bit.

Description

technical field [0001] The invention relates to the field of frequency divider design, in particular to a multi-mode programmable frequency divider. Background technique [0002] In order to improve the spectrum utilization rate of the system, most mobile communication systems adopt frequency division multiplexing technology, and the channel of the transceiver will be switched in real time according to the channel occupancy and channel quality when the transceiver communicates. The frequency synthesizer provides the carrier signal for the transceiver, and the programmable frequency divider is the core device in the frequency synthesizer, which directly controls the channel selection and is the key to the entire tunable chip design. Therefore, high operating frequency, wide frequency division ratio range, low power consumption, etc. are usually the general requirements of the system for frequency dividers. [0003] The multi-mode programmable frequency divider is a programma...

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Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a multi-mode programmable frequency divider, to solve the waste of power consumption of the existing multi-mode programmable frequency divider

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