Frequency synthesizer

A frequency synthesizer, frequency technology, used in power oscillators, output stability, electrical components, etc., can solve problems such as difficulty in controlling small frequency changes, limiting the maximum output frequency of crystal oscillators, and expensive high-quality crystals.

Inactive Publication Date: 2008-09-24
曹秀娟
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, such a voltage-controlled temperature-compensated crystal oscillator first requires a high-quality crystal to meet the three-level linear compensation requirement, and such a high-quality crystal is very expensive, especially a small-sized crystal
It is also difficult to guarantee high-frequency stabil...

Method used

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0036] figure 1 shows the temperature compensated output frequency f in the present invention out temperature compensated frequency synthesizer 100. Oscillating circuit 101 generates reference frequency signal f by crystal oscillator 117 R . The reference frequency signal f R It is used as a reference clock of a frequency-locked loop 107 (Frequency-Looked Loop, FLL for short). The frequency locked loop 107 generates a desired output frequency f by using a frequency corrected control signal FCW_new (frequency corrected control signal) OUT . One of the advantages, purposes or characteristics of the present invention is to adjust the reference clock f by the frequency correction control signal FCW_new R Compensate for frequency drift. In one embodiment, the frequency correction control signal FCW_new is generated by the frequency cor...

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Abstract

The invention discloses a frequency synthesizer comprising a frequency-locked loop which runs based on the reference frequency of a crystal oscillator, a frequency correction unit and an interpolation logic unit; wherein, the frequency correction unit generates a digital frequency correction control word based on a first parameter and a second parameter; the first parameter is a combination of an automatic frequency correction word and a fixed frequency control word. The interpolation logic unit is used for generating the second parameter which expresses the temperature changing compensation; wherein, when the first parameter is a constant, the frequency-locked loop generates a fixed clock signal or when the first parameter is a binary sequence which expresses the frequency changing of a modulating signal, the frequency-locked loop generates a frequency modulating signal; temperature compensation to the frequency excursion of a reference clock can be realized by controlling the frequency correction control word.

Description

technical field [0001] The invention relates to the field of electronic circuit design, in particular to a compensation technology for temperature frequency drift of a frequency synthesizer. technical background [0002] In order to ensure that all electronic devices work properly or synchronously, it is very important to provide accurate clock signals in electronic circuit design. Usually, the clock signal is generated by a crystal oscillator, wherein the crystal oscillator is an electronic circuit that utilizes the mechanical resonance of an oscillating crystal of piezoelectric material to generate an electrical signal of a certain frequency. This frequency is often used for timekeeping (such as in a quartz watch), it can also be used to provide a clock signal for a digital integrated circuit, and it can also be used to stabilize the frequency of a wireless transmitter / receiver. One cause of a clock signal that differs from design is temperature, which can affect the oper...

Claims

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Application Information

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IPC IPC(8): H03L1/02H03B5/04
Inventor 曹伟勋
Owner 曹秀娟
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