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Fractional-n frequency synthesizer and its method

A frequency synthesizer and fractional technology, applied in power oscillators, pulse counters, counting chain pulse counters, etc., can solve the problems of increasing power consumption, increasing time error, occupation, etc., and achieve the effect of improving overall performance and reducing power consumption

Active Publication Date: 2021-08-06
BEKEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the loop divider receives the output of a voltage-controlled oscillator (VCO) (in most cases, the VCO frequency is the highest frequency of the frequency synthesizer), the implementation of multipath inevitably increases power consumption
Also, for designs of frequency synthesizers that include analog blocks based on analog circuits, multipathing leads to increased area, which also poses a problem because it takes up valuable silicon area on the chip
In addition, due to the compact arrangement of multiple paths in the layout design, the coupling between frequency dividers will add timing errors to each output path, which will further affect the overall performance

Method used

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  • Fractional-n frequency synthesizer and its method
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  • Fractional-n frequency synthesizer and its method

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Embodiment Construction

[0030] Various aspects and various embodiments of the invention will now be described. The following description provides specific details to provide a thorough understanding and practice of these embodiments. However, it will be understood by those skilled in the art that the present invention may be practiced without these details. Also, some well-known structures or functions may not be disclosed or described in detail to avoid unnecessarily obscuring the related description.

[0031] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0032] figure 1 It is a block diagram of a fractional-N frequency synthesizer 100 (abbreviation: frequen...

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Abstract

The invention discloses a fractional N frequency synthesizer and a method thereof. Only one loop frequency divider is needed to realize the quantization noise filtering method, which can reduce power consumption and improve performance. The frequency synthesizer includes a polyphase generator, a multipath error phase generator; a current combiner; a loop filter connected to the current combiner; an oscillator (150) connected to the loop filter; A frequency divider (160); an SDM connected to the frequency divider and polyphase generator for generating a variable frequency division ratio.

Description

technical field [0001] The present invention relates to the technical field of mixed signal circuits, more specifically but not limited to a fractional-N frequency synthesizer and its method. Background technique [0002] A conventional fractional-N frequency synthesizer obtains an average non-integer division ratio by modulating the division ratio of the loop divider. In order to suppress quantization noise, a finite impulse response filter (FIR) with a specific frequency response is introduced into the loop of a fractional-N frequency synthesizer, and a circuit consisting of the FIR filter and, for example, components in a conventional phase-locked loop (PLL) is formed structure. By controlling the frequency response of the FIR filter, suppression of quantization noise in a specific frequency range can be achieved, which improves the performance of the frequency synthesizer. [0003] Conventionally, the use of FIR-type quantization noise filters in frequency synthesizers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/00H03L7/18
CPCH03L7/18H03M3/32H03M7/3004H03C3/0925H03C3/0933H03L7/081H03L7/1976H03L7/087H03K23/68H03B21/025
Inventor 不公告发明人
Owner BEKEN CORP