Frequency divider and wireless communication device

Abstract

The embodiment of the invention discloses a frequency divider and a wireless communication device. The frequency divider comprises a shifting register unit and an output frequency synthesis unit, wherein the shifting register unit comprises multiple basic units cascaded circularly; each basic unit comprises 2N D flip-flops connected in series and a multi-path gating device, output of the 2N D flip-flops connected in series is connected into the multi-path gating device, and the output of the multi-path gating device is connected with input of the basic unit at a next level; the phase of clock signals connected into other 2N-1 D flip-flops except the first D flip-flop at the signal input end of the basic unit at each level is lagged than that of clock signals connected into the first D flip-flop by a M / 2 clock period; the phase of clock signals connected to the first D flip-flop in the basic unit at the next level is lagged than that of clock signals connected into other 2N-1 D flip-flops in the basis unit at the previous level by three fourths clock period; output signals of the first D flip-flops in the basic units at all the levels are superposed through the output frequency synthesis unit to generate fractional frequency output signals.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a frequency divider and wireless communication equipment. Background technique [0002] In the transceiver (Transceiver, TRX) circuit of the radio frequency communication system, such as figure 1 As shown, the received RF signal passes through a band-pass filter to filter out-of-band interference, and is amplified by a low noise amplifier (LNA) to reduce the impact of the subsequent circuit noise, and then sent to the mixer input. Mixing with the local oscillator (LO) signal. Therefore, a stable LO signal is required as a reference signal for the transceiver link. This signal is obtained by dividing the output frequency of a Voltage-Controlled Oscillator (VCO). In order to generate an accurate and stable frequency at the output of the VCO, a phase-locked loop is usually used to drive the VCO in the feedback loop to make the oscillator Frequency (or phase) accurately t...

AI Technical Summary

Problems solved by technology

In this solution, multiple frequency dividers are completely independent, which consumes a lot of resources, which is not conducive to the realization of low power consumption and low noise

And the multi-channel frequency divider is strictly started according to the required timing, so the corresponding startup circuit is required, and the timing of the startup circuit is closely related to the frequency division ratio, which is not easy to realize configurable

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