Full-difference bimodule prescalar with low power consumption

Abstract

The invention discloses a full-difference bimodule prescalar with low power consumption, comprising a full-difference 2 / 3 frequency divider, an N-1 grade serial full-difference 2-frequency divider array and an N-1 grade serial full-difference negative and gate array; the output of the full-difference 2 / 3 frequency divider is connected with an N-1 grade serial full-difference 2-frequency divider in series; and the input of the full-difference 2 / 3 frequency divider is connected with an N-1 grade serial full-difference negative and gate in series. The 2 / 3 frequency divider consists of two full-difference D triggers with an NOR function. Two circuits with same function and different structures are used in the 2-frequency divider array and the negative and gate array according to different work frequencies. Signals transmitted inside the circuits are all full-difference signals, so that the circuits can still work at lower mains voltage and higher work frequency and the dynamic power consumption of the circuits is effectively reduced. The 2-frequency divider and the negative and gate which have the same function and different structures are used, so that the integral circuit can work at higher work frequency and has lower quiescent current.

Description

Technical field [0001] The invention relates to the field of low-power frequency dividers, in particular to a low-power full-differential dual-mode pre-frequency divider that uses a dual-mode pre-frequency divider to realize programmable frequency division. Background technique [0002] In a phase-locked loop frequency synthesizer, a 2 N Or 2 N The dual-mode prescaler divided by +1 prescales the output signal of the voltage-controlled oscillator (VCO), and then counts and controls the output signal of the prescaler through two programmable counters Prescaler at 2 N Or 2 N Periodic switching between +1 frequency division modes to achieve arbitrary integer frequency division of the VCO output signal. The dual-mode prescaler, as a frequency divider module that works at a very high frequency, accounts for 20% to 40% of the total power consumption of the phase-locked loop frequency synthesizer. Especially in the low-power phase-locked loop frequency synthesizer design, the performanc...

AI Technical Summary

Problems solved by technology

Especially in the design of a low-power phase-locked loop frequency synthesizer, the optimization of the performance and power consumption of the dual-mode prescaler has become one of the key points of the design, and it is also the bottleneck for further reducing the overall system power consumption.

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