CN216959830U

CN216959830U - Harmonic generator

Info

Publication number: CN216959830U
Application number: CN202220546808.XU
Authority: CN
Inventors: 黄俊淮; 左烈
Original assignee: Chengdu Kinwoo Technology Co ltd
Current assignee: Chengdu Kinwoo Technology Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-07-12
Anticipated expiration: 2032-03-14

Abstract

The utility model discloses a harmonic generator, which comprises an attenuator, an amplifier, a filter, an input matching network and a comb spectrum pulse generator which are electrically connected in sequence. The harmonic generator inputs 1 path of 500MHz radio frequency signals, outputs one path of output frequency range including multiple harmonics as follows: 500M-18000MHz, the interval 500MHz radio frequency signal, the output power is: 18G is more than or equal to-20 dBm.

Description

Harmonic generator

Technical Field

The utility model relates to the technical field of signal generators, in particular to a harmonic generator.

Background

The comb spectrum signal generator has common application in a frequency agile radar requiring an excitation source to output dozens of fast hopping high-purity spectrum frequency points, and is often a key device for expanding frequency bands in a general receiver, instrument equipment and frequency scale. In addition, a millimeter wave frequency source can be easily obtained through the frequency doubling effect of the microwave frequency source, and the microwave frequency source has wide application in the aspects of millimeter wave communication, military reconnaissance, guidance and the like, however, in the prior art, most of input radio frequency signals are 100M-200M, and when the input radio frequency signals cannot adapt to the radio frequency signals of 500M, low-frequency and high-stability signals are extended to high-frequency, wide-frequency and high-stability microwave signals.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a harmonic generator, which is used for outputting 500M-18000MHz and 500MHz interval by sequentially adopting a radio frequency input signal through a resistance attenuator, an amplifier, a filter and a comb spectrum pulse generator and solving the problem that the conventional harmonic generator cannot adapt to the 500M radio frequency input signal.

A harmonic generator comprises an attenuator, an amplifier, a filter, an input matching network and a comb spectrum pulse generator which are electrically connected in sequence.

Further, the attenuator is a resistance attenuator, the resistance attenuator includes resistance R1, resistance R2 and resistance R3, the one end of resistance R1 is connected with the signal input end respectively, the one end of resistance R2, the other end of resistance R1 is connected with the input of amplifier respectively, the one end of resistance R3, the other end of resistance R2 and resistance R3 all is connected to ground.

Furthermore, the filter is an inverted-L high-pass filter composed of a capacitor C4 and an inductor L4, one end of the capacitor C4 is connected to the output end of the amplifier, the other end of the capacitor C4 is connected to one end of the inductor L4 and the input end of the input matching network, respectively, and the other end of the inductor L4 is connected to ground.

Further, the input matching network comprises a capacitor C5 and an inductor L2, the capacitor C5 is connected in parallel to two ends of the L4, one end of the inductor L2 is connected to one end of an inductor L4, and the other end of the inductor L2 is connected to an input end of the comb spectrum pulse generator.

Further, the comb spectrum pulse generator comprises a step recovery diode D1, a capacitor C6 and an inductor L3, wherein one end of the inductor L3 is connected to the other end of the inductor L2, the other end of the inductor L3 is connected to the anode of a step recovery diode D1, the cathode of the step recovery diode D1 is connected to the ground, and the capacitor C6 is connected between the inductor L2 and the inductor L3.

Further, a capacitor C3 is connected in series between the input end of the amplifier and the other end of the resistor R1.

Further, a capacitor C2 is connected between the signal input terminal and one end of the resistor R1.

Further, a bias circuit is connected to the amplifier, the bias circuit comprises a 5V power supply and an inductor L1 connected between the 5V power supply and the amplifier, and the 5V power supply is also connected to the ground through a capacitor C1.

The utility model has the following beneficial effects: compared with the traditional scheme, the harmonic generator designed by the utility model improves the circuit part, and experimental data show that the harmonic generator after being improved is used for generating harmonic frequency with high frequency spectrum conversion efficiency and good phase noise performance, and simultaneously, the direct current power consumption of the circuit is greatly reduced. The harmonic generator inputs 1 path of 500MHz radio frequency signals, outputs one path of output frequency range including multiple harmonics as follows: 500M-18000MHz, 500MHz apart radio frequency signal, output power: 18G is more than or equal to-20 dBm.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the circuit structure of the present invention;

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Specifically, the attenuator is a resistance attenuator, the resistance attenuator includes resistance R1, resistance R2 and resistance R3, signal input, the one end of resistance R2 are connected respectively to one end of resistance R1, the input of amplifier, the one end of resistance R3 are connected respectively to the other end of resistance R1, the other end of resistance R2 and resistance R3 all is connected to ground.

The filter is an inverted L-shaped high-pass filter composed of a capacitor C4 and an inductor L4, one end of the capacitor C4 is connected with the output end of the amplifier, the other end of the capacitor C4 is respectively connected with one end of the inductor L4 and the input end of the input matching network, and the other end of the inductor L4 is connected to the ground.

Specifically, the input matching network comprises a capacitor C5 and an inductor L2, the capacitor C5 is connected in parallel to two ends of the L4, one end of the inductor L2 is connected to one end of the inductor L4, and the other end of the inductor L2 is connected to an input end of the comb spectrum pulse generator.

Specifically, the comb spectrum pulse generator comprises a step recovery diode D1, a capacitor C6 and an inductor L3, one end of the inductor L3 is connected to the other end of the inductor L2, the other end of the inductor L3 is connected to the anode of a step recovery diode D1, the cathode of the step recovery diode D1 is connected to the ground, and the capacitor C6 is connected between the inductor L2 and the inductor L3.

Specifically, a capacitor C3 is connected in series between the input end of the amplifier and the other end of the resistor R1.

Specifically, a capacitor C2 is connected between the signal input terminal and one end of the resistor R1.

Specifically, the amplifier is further connected with a bias circuit, the bias circuit comprises a 5V power supply and an inductor L1 connected between the 5V power supply and the amplifier, and the 5V power supply is further connected to the ground through a capacitor C1.

SRDs (step recovery diodes) are devices with very strong non-linear characteristics, which are used to generate narrow current pulses. Its efficiency in generating harmonics can be close to 1/n, where n represents the harmonic order. The step recovery diode frequency multiplier does not need an idle circuit, so that the circuit has the advantages of simplicity and compactness. Therefore, step recovery diodes are often suitable for applications requiring high efficiency, high order frequency multiplication. Due to the structural characteristics of the step diode: with low capacitance in the high impedance state and large capacitance in the low impedance state. Under the excitation of high frequency or abrupt voltage, the step recovery diode stores a large amount of charges when conducting in the forward direction and presents a very low impedance state; when turned to reverse bias, these stored charges return to their original place, creating a large reverse current. By the time the stored charge approaches depletion, the reverse current decreases rapidly and immediately approaches a cut-off, i.e., a step recovery, at a steep rate. It is because of this abrupt change in reverse current that a reverse narrow pulse voltage is formed. The narrower the backward pulse, the more abundant the harmonic it contains, and it can form a higher harmonic spectrum including integral multiple of the fundamental frequency from several tens MHz to several GHz to several tens GHz, so it has the advantage of high order efficiency.

In order to obtain rich harmonic output, the step recovery diode needs to generate a large narrow current pulse, and an input signal needs to be amplified to a certain power to drive the step recovery diode. And the amplifier is the main source of additional phase noise generation of the comb spectrum signal generator. If the output power of the amplifier is too high, the diode will be overdriven and the additive phase noise will be severely corrupted. The input matching circuit is used for effectively applying the power of the power amplifier to the diode, and can maximally produce stronger extremely-narrow current pulse, and at the same time, the harmonic energy produced by diode can not be backward flowed into the amplifier.

L3 is excitation inductance for storing and releasing energy to obtain large amplitude step current; c6 is a tuning capacitor, which is used to tune the input admittance of the comb spectrum pulse generator, the input impedance of the tuned comb spectrum pulse generator is a pure resistance, so that the exciting inductance is detuned on the input frequency, and all harmonics except the output frequency are bypassed, and the input impedance of the comb spectrum pulse generator can be pure resistance by properly selecting the value of C6; d1 is an SRD (i.e., step recovery diode) that forms a comb spectrum pulse generator with L3 and C6.

The input matching network is used for completing the matching of the impedance of the excitation source and the input impedance of the comb spectrum pulse generator, so that the power of an input reference signal is effectively loaded on the SRD, extremely narrow current pulses are generated to the maximum extent, and the harmonic energy generated by the step diode and reversely connected to the reference amplifier in series is reduced. In view of this, the input impedance presented by the stepped-tube comb spectrum pulse generator to the fundamental wave under pulsed operation must be found.

The step recovery diode with the steep change capacitance characteristic works in two states of conduction and step under the action of exciting voltage, and forms a spike pulse with short duration and large amplitude at the step moment. The pulse energy spectrum is uniformly distributed in a comb shape, and certain energy is still output on dozens of or even hundreds of harmonic frequencies. The step recovery diode frequency multiplier is adapted to form a high frequency multiplier but does not require a large high order multiplier and comb spectrum signal generator for amplitude. The input signal of single frequency gets the signal of extremely wide frequency spectrum after the step recovery diode pulse generator, and the energy of the wide frequency spectrum signal is dispersed on each subharmonic.

The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.

Claims

1. A harmonic generator is characterized by comprising an attenuator, an amplifier, a filter, an input matching network and a comb spectrum pulse generator which are electrically connected in sequence:

the attenuator is a resistance attenuator, the resistance attenuator comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is respectively connected with the signal input end and one end of the resistor R2, the other end of the resistor R1 is respectively connected with the input end of the amplifier and one end of the resistor R3, and the other ends of the resistor R2 and the resistor R3 are both connected to the ground;

the filter is an inverted L-shaped high-pass filter consisting of a capacitor C4 and an inductor L4, one end of the capacitor C4 is connected with the output end of the amplifier, the other end of the capacitor C4 is respectively connected with one end of an inductor L4 and the input end of the input matching network, and the other end of the inductor L4 is connected to the ground;

the input matching network comprises a capacitor C5 and an inductor L2, wherein the capacitor C5 is connected in parallel to two ends of the L4, one end of the inductor L2 is connected to one end of an inductor L4, and the other end of the inductor L2 is connected to an input end of the comb spectrum pulse generator.

2. The harmonics generator of claim 1, wherein said comb spectrum pulser comprises a step recovery diode D1, a capacitor C6, and an inductor L3, wherein one end of said inductor L3 is connected to the other end of said inductor L2, the other end is connected to the anode of a step recovery diode D1, the cathode of said step recovery diode D1 is connected to ground, and a capacitor C6 is connected between said inductor L2 and said inductor L3.

3. A harmonics generator according to claim 1, wherein a capacitor C3 is connected in series between the input of said amplifier and the other end of the resistor R1.

4. A harmonics generator according to claim 3, wherein a capacitor C2 is connected between the signal input and one end of a resistor R1.

5. A harmonics generator according to claim 1 wherein the amplifier is further connected to a bias circuit comprising a 5V supply and an inductor L1 connected between the 5V supply and the amplifier, the 5V supply being further connected to ground via a capacitor C1.