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Frequency synthesizer and method for generating output signal of desired frequency by the synthesizer

A technology of frequency synthesizer and output signal, applied in the direction of automatic power control, electrical components, etc., can solve the problems of manufacturing difficulties, large chip area, interference, etc.

Active Publication Date: 2015-08-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These resonant circuits create additional manufacturing difficulties due to the large chip area required
In addition, these resonant circuits may couple, causing undesired interference effects

Method used

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  • Frequency synthesizer and method for generating output signal of desired frequency by the synthesizer
  • Frequency synthesizer and method for generating output signal of desired frequency by the synthesizer
  • Frequency synthesizer and method for generating output signal of desired frequency by the synthesizer

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Embodiment Construction

[0019] The present invention provides a frequency synthesizer that can be fabricated on a smaller silicon chip without consuming large amounts of power. figure 1 An exemplary frequency synthesizer 10 according to the present invention is shown. The frequency synthesizer 10 includes: an oscillator 12 , a digitization circuit 20 and a digital signal processor (DSP) 30 . In some embodiments, frequency synthesizer 10 may also include a noise suppressor 60, as described below. Oscillator 12 generates an analog output signal S at the desired frequency o . Oscillator 12 may be any type of oscillator having an electronically controllable frequency including, but not limited to, an inductor-capacitor resonant circuit oscillator, a surface acoustic wave oscillator, or a multi-frequency oscillator. The oscillator can also operate at multiple desired output frequencies, and then use a digital divider to split the output of the oscillator to generate a multiphase feedback signal S f . ...

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PUM

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Abstract

A frequency synthesizer according to the present invention digitally controls an analog oscillator to generate an analog output signal at a desired frequency. A digitizing circuit converts a feedback signal derived from the oscillator output signal to a digitized multi-phase feedback signal. A comparator compares the digitized multi-phase feedback signal to a reference signal generated by the reference signal generator to generate an error signal indicative of the phase error in the output signal. A control circuit generates a control signal based on the error signal to control the frequency of the oscillator output signal.

Description

technical field [0001] The present invention relates generally to frequency synthesizers, and more particularly to digitally controlled frequency synthesizers. Background technique [0002] Most electronic communication equipment includes frequency synthesizers. Conventional frequency synthesizers typically use an accurate reference oscillator, such as a surface acoustic wave (SAW) resonator, to control a controllable oscillator to generate an output signal at one or more desired frequencies. The output signal(s) are used by the electronic device to control timing and / or communication operations. [0003] A direct digital synthesizer represents one type of frequency synthesizer. A direct digital synthesizer computes a sequence of numbers that addresses a table of values ​​to produce samples of a waveform at a desired output frequency. The synthesizer generates an analog output signal at the desired frequency by performing a digital-to-analog conversion on the calculated o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/085H03L7/18
CPCH03L7/091H03L7/087H03L7/093
Inventor P·威尔金森登特N·克莱默
Owner TELEFON AB LM ERICSSON (PUBL)