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Frequency synthesizer, frequency selection circuit and frequency selection method thereof

A technology of frequency synthesizer and frequency selection circuit, which is applied in the field of frequency synthesizer, can solve the problems of interfering with the DC operating point of the mixer and the decline of anti-interference ability, and achieve the effect of simple structure, low noise and high performance

Active Publication Date: 2010-05-12
豪威国际控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the 1 / 3+2 / 3 high-frequency clock (LO) generation structure, in addition to the required clock signal, 1 / 3LO useless signals will also be generated. If no special processing is done, it may interfere with the dc of the mixer operating point and the anti-interference ability is reduced in some frequency bands

Method used

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  • Frequency synthesizer, frequency selection circuit and frequency selection method thereof
  • Frequency synthesizer, frequency selection circuit and frequency selection method thereof
  • Frequency synthesizer, frequency selection circuit and frequency selection method thereof

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Embodiment 1

[0027] This embodiment introduces the present invention by taking the mixing of 1 / 3 of the required frequency and 2 / 3 of the required frequency as an example. The present invention combines a 1 / 3+2 / 3 filter circuit and a frequency mixing circuit to amplify useful signals and filter and suppress useless signals.

[0028] see Figure 2 to Figure 4 , the present invention discloses a frequency selection circuit of a frequency synthesizer, the frequency selection circuit includes a capacitor C1, a capacitor C2, an inductor L1, and an inductor L2; the two ends of the capacitor C1 are respectively connected to one end of the inductor L1 and the inductor L2; The two ends of the capacitor C2 are respectively connected to the other end of the inductor L1 and the inductor L2; the two ends of the capacitor C1 are respectively connected to the mixer, and the connection terminals are denoted as OUTP and OUTN; the values ​​of the inductor and capacitor C2 are set to make the circuit resonat...

Embodiment 2

[0048] figure 1 It is a schematic structural diagram of a mixer in this embodiment, wherein the mixer uses an up-selective LC network as a load.

[0049] figure 2 is the schematic diagram of the LC network, image 3 , Figure 4 Yes figure 2 Equivalent circuit diagram of the schematic for the LC network. The two inductors adopt the structure of a transformer, which not only increases the inductance value of the inductor but also reduces the area.

[0050] exist figure 2 In the frequency selection circuit, first select the value of L and C (parallel connection of CC3 and CC1 / 2) to make it resonate at the frequency (low frequency) to be filtered, and the impedance seen at both ends of OUTP and OUTN is the equivalent of the inductance The series resistance realizes the filtering function. exist figure 2 The LC resonant circuit in the equivalent circuit of the stop band shows an inductance characteristic as the frequency becomes higher for the pass band. At this time, ...

Embodiment 3

[0053] This embodiment discloses a frequency synthesizer, which includes a frequency selection circuit and a frequency mixing circuit. The frequency selection circuit includes a capacitor C1, a capacitor C2, an inductor L1, and an inductor L2; the two ends of the capacitor C1 are respectively connected to one end of the inductor L1 and the inductor L2; the two ends of the capacitor C2 are respectively connected to the other end of the inductor L1 and the inductor L2 ; At the same time, the two ends of the capacitor C1 are respectively connected to the mixer, and the connection points are recorded as OUTP and OUTN; the values ​​of the inductance and the capacitor C2 are set to make the circuit resonate at the frequency of the filter, and the impedance at both ends of OUTP and OUTN is the equivalent of the inductance series resistance, the frequency selection circuit is a filter circuit; the value of the capacitor C1 is set to make the circuit resonate at the frequency of the pas...

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Abstract

The invention discloses a frequency synthesizer and a frequency selection circuit which comprises a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2, wherein, two ends of the capacitor C1 are respectively connected with one end of the inductor L1 and one end of the inductor L2; two ends of the capacitor C2 are respectively connected with the other end of the inductor L1 and the other end of the inductor L2; two ends of the capacitor C1 are respectively connected with a mixer; the connection end points are recorded as OUTP and OUTN; the values of the inductor and the capacitor C2 are set to lead the circuit to resonate on the frequency of the filtration; the impedances at the two ends of OUTP and OUTN are equivalent series resistors of inductors; the frequency selection circuit is a filtering circuit; the value of the capacitor C1 is set to lead the circuit to resonate on the frequency of a passband; at the moment, the two ends of OUTP and OUTN are LC parallel resistors; the frequency selection circuit is an amplifying circuit. In the invention, the 1 / 3 + 2 / 3 filtering circuit and the mixer circuit are combined together to amplify useful signals and suppress useless signals, and the chips can be integrated.

Description

technical field [0001] The invention relates to a frequency synthesizer, in particular to a frequency selection circuit of the frequency synthesizer; in addition, the invention also relates to a frequency selection method of the frequency selection circuit of the frequency synthesizer. Background technique [0002] With the development of radio frequency integrated circuit technology, CMOS technology is gradually becoming the first choice for radio frequency integrated circuit design due to its many advantages. In radio frequency circuits, whether it is a secondary frequency conversion structure, zero intermediate frequency structure, low , Mixer frequency synthesizer is one of the essential circuits. [0003] According to the architecture of frequency generation, the common ones can be divided into three types: VCO works at 2 times the required frequency, works at 2 / 3 times the required frequency, and directly works at the required frequency. The VCO working frequency is 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/00H03H7/09
Inventor 刘瑞金迮德东
Owner 豪威国际控股有限公司