CN103078605A - High-frequency ultra-wideband power limiter design method - Google Patents

Abstract

The invention provides a high-frequency ultra-wideband power limiter design method, which comprises the following steps: that the traditional circuit model is firstly improved; an amplification circuit does not needs not to be driven; a resonant coupling unit is connected on a branch circuit in series; a power limiter can be adjusted and limited within the range of given frequency and bandwidth; different voltage values are generated through a transformer; and a milliwatt circuit can be limited, and a certain flexibility can be shown, so that the problem that the circuit structure of the traditional power limiter is more complex and is not easy to adjust can be effectively overcome, and the condition that the best power limiting effect can be obtained by the limiter can be guaranteed.

Description

A kind of high frequency ultra broadband load limiter method for designing

Technical field

The present invention relates to a kind of high frequency ultra broadband load limiter method for designing.

Technical background

In communication equipment and sorts of systems.The application of load limiter is very extensive, and so the good and bad quality that directly determines product of load limiter is to the research of load limiter with to produce always be various countries' attention.Because the development of computer technology, integrated technique and material industry, the development of load limiter also steps on a new stage, and towards high accuracy, low-power consumption, small size future development.While is along with the digital communication system clock frequency improves constantly, and the increase of digital network aspect speed and bandwidth, load limiter is had wider passband also propose higher requirement.And it is narrower to utilize the conventional power limiter to be faced with bandwidth, the circuit structure more complicated, the problem that is difficult for the adjusting problem, the present invention is mainly based on this point, adopt a new high frequency power limiter circuitry structure, adopting increases the load limiter algorithm that resonant element designs a kind of ultra broadband, thereby obtains best Power Limitation effect.

Summary of the invention

The present invention proposes a kind of high frequency ultra broadband load limiter method for designing, the method at first is that the traditional circuit model is improved, demand motive amplifying circuit not, series resonance coupling unit on branch road, load limiter is regulated, restriction in the scope of given frequency and bandwidth.Produce different magnitudes of voltage by transformer, can the circuit of milliwatt level be limited, and show certain flexibility, effectively overcome conventional power limiter circuitry complicated structure, be difficult for the adjusting problem, can guarantee that limiter obtains best Power Limitation effect.

The technical scheme concrete steps that the present invention proposes comprise:

Analyze the performance index of load limiter, the load limiter circuit is shown in figure l;

Circuit characteristic admittance Y ₀=1/Z ₀, G, LC are respectively nonlinear conductance and the resonant elements of this circuit, transformation ratio is nl;

The transfer function of circuit can be expressed as

$f=\frac{2\sqrt{k_1{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="DEST\_PATH\_HSB00001041627700011.png,DEST\_PATH\_HSB00001041627700023.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}}{1+k_1{k}_2}---\left(1\right)$

K wherein ₁, k ₂It is coupling factor.

${\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="DEST\_PATH\_HSB00001041627700011.png,DEST\_PATH\_HSB00001041627700021.png"\; state="\{\{state\}\}">k</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="DEST\_PATH\_HSB00001041627700011.png,DEST\_PATH\_HSB00001041627700023.png"\; state="\{\{state\}\}">k</figure-callout>}}_2=\frac{Y_0}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="DEST\_PATH\_HSB00001041627700011.png,DEST\_PATH\_HSB00001041627700023.png"\; state="\{\{state\}\}">n</figure-callout>}}^2\&CenterDot;G}---\left(2\right)$

The transform characteristics admittance of excitation end is

$f=\frac{1}{1+\frac{{{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="DEST\_PATH\_HSB00001041627700011.png,DEST\_PATH\_HSB00001041627700021.png"\; state="\{\{state\}\}">n</figure-callout>}}_1}^{2}G}{2Y_0}}---\left(3\right)$

Employed nonlinear conductance be the inverse parallel Schottky to diode, its peak signal impedance depend on the electricity of the amplitude diode of signal lead mainly depend on the node parameter and and series resistance R _s, anti-and connect diode and can seemingly regard a zero offset dynamic conductivity as for lower powered situation, for higher input signal power, dynamic conductivity begins to increase, diode pair always connect nearly limits value, equal 1/R _s

Utilize above-mentioned formula, finally can determine each component value of load limiter.

Technique effect of the present invention: the above-mentioned high frequency ultra broadband load limiter design technology project that the present invention proposes, the design consideration actual needs can be designed the best power limiter parameters to satisfy actual requirement, the method tradition has not only been saved the load limiter design cycle based on the engineering experience method for designing, and can the circuit of milliwatt level be limited, and show one flexibility, effectively overcome conventional power limiter circuitry complicated structure, be difficult for the adjusting problem, can guarantee that limiter gets best Power Limitation effect.

Description of drawings

Fig. 1 is load limiter circuit topological structure figure after improving;

Fig. 2 is the inverse parallel Schottky diode;

Fig. 3 is the anti-paralleled diode characteristic;

Fig. 4 is the three-dimensional response diagram of function f;

Fig. 5 is load limiter circuit theory diagrams in the EXAMPLE l;

Fig. 6 is the amplitude-frequency characteristic figure of embodiment 1 median filter;

Embodiment

Embodiment:

Designed a high frequency ultra broadband load limiter, the circuit resonant frequency is 3GHz, and three dB bandwidth is 260MHZ, the return loss of circuit and insertion loss etc.-12db and-O.5DB, input power is 30dBM, the 26dBM of input power begin the restriction;

Utilize above-mentioned algorithm, designed load limiter as shown in Figure 5; Its amplitude-frequency characteristic as shown in Figure 6;

As can be seen from Figure 6, the center of its load limiter is 3GHz, and its amplitude characteristic is good, and stopband attenuation is large;

Oneself successfully is used for certain pulse receiver this high frequency power limiter, and through the modulation and demodulation of FSK, Output rusults is good.Use the result to show that this device has good inhibition degree to receiver modulating pulse and noise level, compare with similar load limiter, and it is narrower to utilize the conventional power limiter to be faced with bandwidth, the circuit structure more complicated, the problem that is difficult for the adjusting problem, the present invention adopts a new load limiter circuit structure mainly based on this point, adopting increases the load limiter algorithm that resonant element designs a kind of high frequency ultra broadband, thereby obtains best Power Limitation effect.

Claims (4)

1. high frequency ultra broadband load limiter method for designing, it is characterized in that: the method at first is that the traditional circuit model is improved, demand motive amplifying circuit not, series resonance coupling unit on branch road, load limiter is regulated, restriction in the scope of given frequency and bandwidth.Produce different magnitudes of voltage by transformer, can the circuit of milliwatt level be limited, and show certain flexibility, effectively overcome conventional power limiter circuitry complicated structure, be difficult for the adjusting problem.

2. method according to claim 1 is characterized in that, circuit characteristic admittance Y ₀=1/Z ₀, G, LC are respectively nonlinear conductance and the resonant elements of this circuit, transformation ratio is n ₁

3. method according to claim 1 is characterized in that, the transfer function of circuit can be expressed as

K wherein ₁, k ₂It is coupling factor.

The transform characteristics admittance of excitation end is

。

4. method according to claim 1 is characterized in that, the nonlinear conductance of use be the inverse parallel Schottky to diode, the amplitude of signal is depended in its peak signal impedance, the electricity of diode lead mainly depend on the node parameter and and series resistance R _s, anti-and connect diode and can be similar to and regard a zero offset dynamic conductivity as for lower powered situation, for higher input signal power, dynamic conductivity begins to increase, and the nearly limits value of total electric connection of diode pair equals 1/R _s

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