Non-bur CMOS radio frequency divider based on phase switch
A phase-switching, glitch-free technology, applied in automatic power control, synchronous pulse counters, electrical components, etc., can solve problems such as complexity, limited maximum speed, and large glitches in CMOS RF frequency dividers, so as to improve working speed and avoid The use of logic gates, the effect of eliminating glitch signals
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[0016] like figure 1 Shown is the structural block diagram of the burr-free CMOS RF frequency divider of the present invention, which mainly includes a four-phase prescaler, a high-speed output selection circuit and a logic control circuit.
[0017] Among them, the four-phase prescaler is based on two input signals IN and IN with opposite phases to provide four reference signals Ph1, Ph2, Ph3 and Ph4 whose phases are sequentially different by 90 degrees to the high-speed output selection circuit. The phase timing diagram can be like figure 2 As shown; the period of these reference signals is four times the period of the input signal, so the phase difference of 90 degrees is exactly one period of the input signal. In one embodiment, the four-phase prescaler can be implemented by cascading two CML two-frequency dividers.
[0018] The high-speed output selection circuit is used to switch the output signals OUT and OUT in the order of Ph1->Ph2->Ph3->Ph4->Ph1 according to the en...
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