JP2021153279A - Amplitude frequency characteristic compensation circuit, radio apparatus and amplitude frequency characteristic compensation method - Google Patents

Abstract

To provide a compact amplitude frequency characteristic compensation circuit having an amplitude characteristic with a steep amplitude change at a frequency change.SOLUTION: An amplitude frequency characteristic compensation circuit 10 includes a stub 3 connected in parallel with a main line 2 for radio signal propagation. The stub 3 includes: a resistor 4 directly connected to the main line 2; a plurality of wires 6; and a plurality of wire bonding patterns 5 for bonding connection between the resistor 4 and any one wire 6, and between the plurality of wires 6. A series resonant circuit is formed by setting a total line length from the resistor 4 to the pattern 5, positioned at the top edge in the stub 3, to be a length which resonates at a preset desired frequency, and by arranging the wires 6 and the patterns 5 so that the Q value of the series resonant circuit has a large value. Thus, a concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 is set to have a steep characteristic.SELECTED DRAWING: Figure 6

Description

The present invention relates to an amplitude frequency characteristic compensation circuit, a wireless device, and an amplitude frequency characteristic compensation method.

Radio frequency (RF) equipment is generally required to have a flat amplitude of radio signals within the frequency range used. However, many parts such as semiconductor amplifiers used in wireless devices have convex amplitude characteristics within the frequency range used, and the amplitude ripple caused by impedance mismatch etc. is also convex amplitude characteristics. May have. Therefore, in order to realize a flat amplitude within the frequency range used as a wireless device, it is necessary to implement a compensation circuit having a concave amplitude frequency characteristic in the wireless device.

As a compensation circuit having such an amplitude frequency characteristic, for example, a line having a resistance and a line length of, for example, (λ / 2) (that is, (1/2) wavelength) in the vicinity of the center frequency within the operating frequency range can be used. As a stub with an open tip, there is a general configuration method in which it is inserted in parallel with the main line that propagates the radio signal.

However, in the case of such a general stub, it is difficult to compensate for the convex amplitude characteristic of a semiconductor amplifier or the like because the amplitude change at the time of frequency change becomes gentle. Further, as an amplitude frequency adjusting circuit having a concave amplitude characteristic, for example, there is a circuit as disclosed in Japanese Patent Application Laid-Open No. 3852603 "Frequency Equalizer" of Patent Document 1, but the circuit described in Patent Document 1 Is configured using a transmission line, so it may be difficult to reduce the size of the circuit due to layout restrictions.

Further, in order to carry out compensation according to the variation of the convex amplitude characteristic of the semiconductor amplifier or the like, it is required as an amplitude frequency compensation circuit that the frequency characteristic can be variably adjusted, and as a method thereof. There is a method in which a circuit is configured by using a variable capacitance element or the like in which the capacitance can be set variably, and the frequency characteristic is changed by changing the applied voltage. However, in the case of such a method, the number of parts increases and it is necessary to add a control signal for changing the applied voltage, which causes an increase in circuit size and cost. It ends up.

Japanese Patent No. 385263

As described above, in the current technology related to the present invention such as Patent Document 1, the ripple of the amplitude caused by the convex frequency characteristic of the component such as the semiconductor amplifier or the impedance mismatch is flattened. There was a problem to be solved that it was not possible to simultaneously satisfy the two requirements of having a concave amplitude frequency characteristic that was steep enough to compensate for the various frequency characteristics and that the circuit could be miniaturized. ..

Further, there is also a problem that it is not possible to realize a function of easily adjusting the frequency characteristics of the amplitude frequency compensating circuit at low cost in order to cope with variations in the characteristics of circuit elements such as parts.

(Purpose of the present invention)
An object of the present invention is to solve such a problem that the amplitude change at the time of frequency change has a steep amplitude characteristic, the size can be reduced, and the frequency characteristic can be easily changed. It is an object of the present invention to provide an amplitude frequency characteristic compensation circuit, a wireless device, and an amplitude frequency characteristic compensation method.

In order to solve the above-mentioned problems, the amplitude frequency characteristic compensation circuit, the wireless device, and the amplitude frequency characteristic compensation method according to the present invention employ the following characteristic configurations.

(1) The amplitude frequency characteristic compensation circuit according to the present invention is
In the amplitude frequency characteristic compensation circuit that compensates for the amplitude frequency characteristic of the propagating radio signal,
It has a stub connected in parallel to the main line for wireless signal propagation.
The stub is
It consists of a resistor directly connected to the main line, a plurality of wires, and a plurality of wire bonding patterns for bonding between the resistor and any one of the wires and between the wires.
And,
A series resonance circuit is formed by setting the total line length from the resistor to the wire bonding pattern located at the tip in the stub to a length that resonates at a predetermined desired frequency.
And,
By arranging the wire and the wire bonding pattern so that the Q value of the formed series resonant circuit becomes a large value, the concave amplitude frequency characteristic is set to a steep characteristic.
It is characterized by that.

(2) The wireless device according to the present invention is
A radio device having an amplitude frequency characteristic compensation circuit that compensates for the amplitude frequency characteristics of a propagating radio signal.
The amplitude frequency characteristic compensation circuit is configured by using the amplitude frequency characteristic compensation circuit described in (1) above.
It is characterized by that.

(3) The amplitude frequency characteristic compensation method according to the present invention is
This is an amplitude-frequency characteristic compensation method that compensates for the amplitude-frequency characteristics of the propagating radio signal.
It has a stub connected in parallel to the main line for wireless signal propagation.
The stub is
It consists of a resistor directly connected to the main line, a plurality of wires, and a plurality of wire bonding patterns for bonding between the resistor and any one of the wires and between the wires.
And,
A series resonance circuit is formed by setting the total line length from the resistor to the wire bonding pattern located at the tip in the stub to a length that resonates at a predetermined desired frequency.
By arranging the wire and the wire bonding pattern so that the Q value of the formed series resonant circuit becomes a large value, the concave amplitude frequency characteristic is set to a steep characteristic.
It is characterized by that.

According to the amplitude frequency characteristic compensation circuit, the wireless device, and the amplitude frequency characteristic compensation method of the present invention, the following effects can be mainly obtained.

According to the present invention, it is possible to realize a convex amplitude frequency characteristic of a semiconductor amplifier or the like, or a steep concave amplitude frequency characteristic sufficient to compensate for an amplitude ripple caused by impedance mismatch or the like. The circuit can be miniaturized due to the high degree of layout freedom.

It is a characteristic diagram which shows an example of the convex amplitude frequency characteristic which a component such as a general semiconductor amplifier has. A characteristic showing an example of the amplitude frequency characteristic after amplitude compensation that compensates for the convex amplitude frequency characteristic of parts such as a general semiconductor amplifier shown in FIG. 1 by using a compensation circuit having a concave amplitude frequency characteristic. It is a figure. Amplitude frequency characteristics after amplitude compensation that compensate for the convex amplitude frequency characteristics of parts such as the general semiconductor amplifier shown in FIG. 1 using a compensation circuit having a sufficiently steep concave amplitude frequency characteristic. It is a characteristic diagram which shows an example. After amplitude compensation when a frequency shift occurs due to variations in the characteristics of circuit elements such as components in the convex amplitude frequency characteristics to be compensated by the compensation circuit having the concave amplitude frequency characteristic curve shown in FIG. It is a characteristic diagram which shows an example of the amplitude frequency characteristic of. Amplitude frequency characteristics after amplitude compensation that compensate for the convex amplitude frequency characteristics that are frequency-shifted due to variations in the characteristics of circuit elements such as the parts shown in FIG. 4 using a compensation circuit that has an amplitude frequency characteristic adjustment function. It is a characteristic diagram which shows an example. It is a block block diagram which shows an example of the internal structure of the amplitude frequency characteristic compensation circuit which concerns on embodiment of this invention. It is a circuit diagram which shows the equivalent circuit of the amplitude frequency characteristic compensation circuit shown in FIG. 6 as an example of the Embodiment of this invention. It is explanatory drawing explaining an example of the adjustment means which adjusts the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit shown in FIG. 6 so as to shift the frequency to an appropriate frequency on the low frequency side. It is explanatory drawing explaining an example of the adjustment means which adjusts the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit shown in FIG. 6 so as to shift the frequency to an appropriate frequency on the high frequency side. FIG. 5 is a block configuration diagram showing another example different from FIG. 6 in the internal configuration of the amplitude frequency characteristic compensation circuit according to the present invention.

Hereinafter, preferred embodiments of the amplitude frequency characteristic compensation circuit, the wireless device, and the amplitude frequency characteristic compensation method according to the present invention will be described with reference to the accompanying drawings. In the following description, the amplitude frequency characteristic compensation circuit and the amplitude frequency characteristic compensation method according to the present invention will be described, but the amplitude frequency characteristic of a wireless device equipped with a circuit for compensating the amplitude frequency characteristic of a radio signal. Needless to say, the compensation circuit may be applied. Further, it is needless to say that the drawing reference reference numerals attached to the following drawings are added to each element for convenience as an example for assisting understanding, and the present invention is not intended to be limited to the illustrated embodiment. stomach.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. As described above, the present invention is steep enough to compensate for the convex amplitude frequency characteristics of components such as semiconductor amplifiers, or the amplitude ripples caused by impedance mismatches, etc., to flat frequency characteristics. It is an object of the present invention to realize an amplitude frequency characteristic compensation circuit which has a concave amplitude frequency characteristic and is compact and can easily adjust the frequency characteristic.

In order to realize such an object, the present invention provides a plurality of wire bonding capable of bonding a resistor, a plurality of wires, and a plurality of wires as stubs connected in parallel to a main line propagating a radio signal. The line length from the resistor to the wire bonding pattern located at the tip of the stub, which is formed by the pattern, is set to a length that causes resonance at a predetermined desired frequency. Then, by arranging a plurality of wires and wire bonding patterns so as to resonate at a high Q value, and by occupying 50% or more of the total line length of the stub by the wires, a steep concave amplitude frequency is obtained. Realize the characteristics. Further, by adopting a configuration that does not require any special restrictions on the direction of the wire, the shape of the wire bonding pattern, etc., the degree of freedom in layout is high and the circuit can be miniaturized.

Further, in the present invention, with respect to a part of the plurality of wires, a plurality of wires are connected in parallel in a wire bonding pattern at any place except the tip end side of the stub, and the other one of the plurality of wires. As for the portion, a plurality of short wires are connected in series between a plurality of wire bonding patterns located on the tip side of the stub. Then, by cutting any one or more of the plurality of wires connected in parallel, or one of the plurality of short wires on the tip side of the stub connected in series, the amplitude of the amplitude frequency characteristic compensation circuit is increased. It is possible to adjust the frequency characteristics, and both ease of adjustment and cost reduction can be realized at the same time.

(Embodiment of the present invention)
Next, an example of the embodiment of the present invention will be described. First, prior to the description of the configuration example of the embodiment of the present invention, the amplitude ripple caused by the convex amplitude frequency characteristic, impedance mismatch, etc. of a general semiconductor amplifier or the like component is compensated, and the amplitude ripple is compensated. An amplitude frequency characteristic compensation method that makes it possible to adjust the compensation characteristics of the compensation circuit according to the frequency shift of the convex amplitude frequency characteristics generated by the variation in the characteristics of circuit elements such as parts will be described with reference to the drawings. do. The amplitude frequency characteristic compensation method described here describes an example of the amplitude frequency characteristic compensation method adopted in the present invention in order to realize a flat amplitude characteristic within the frequency range to be used.

(Amplitude Frequency Characteristic Compensation Method According to the Present Invention)
FIG. 1 is a characteristic diagram showing an example of a convex amplitude frequency characteristic of a component such as a general semiconductor amplifier, in which the horizontal axis is frequency and the vertical axis is amplitude. As shown in the amplitude frequency characteristic curve 11 of FIG. 1, the amplitude has a convex characteristic within the range from the lower limit frequency ω1 to the upper limit frequency ω2, which is the frequency range to be used. Wireless devices are generally required to have flat amplitude characteristics in the operating frequency range. Therefore, in order to compensate for the convex amplitude frequency characteristic as shown in FIG. 1, for example, a compensation circuit having the concave amplitude frequency characteristic as shown in FIG. 2 is required.

FIG. 2 shows the amplitude frequency characteristics after amplitude compensation in which the convex amplitude frequency characteristics of parts such as the general semiconductor amplifier shown in FIG. 1 are compensated by using a compensation circuit having a concave amplitude frequency characteristic. It is a characteristic diagram which shows an example. Here, the compensation circuit propagates a radio signal through an open stub (λ / 4 open stub) composed of a resistor and a line having a line length of (λ / 4) (that is, (1/4) wavelength). An example is shown when the main line is inserted in parallel. In FIG. 2, the convex amplitude frequency characteristic shown in FIG. 1 is shown by the amplitude frequency characteristic curve 11 of the actual gland, and the concave amplitude frequency characteristic of the compensation circuit is shown by the amplitude frequency characteristic curve 12 of the one-point chain line. The amplitude frequency characteristic after the amplitude compensation using the compensation circuit is shown by the amplitude frequency characteristic curve 13 of the broken line.

As shown in the amplitude frequency characteristic curve 12 of FIG. 2, the concave amplitude frequency characteristic of the general λ / 4 open stub compensation circuit is the convex amplitude frequency of a semiconductor amplifier or the like as shown in the amplitude frequency characteristic curve 11. Since the amplitude change at the time of frequency change is slower than the characteristic, as shown in the amplitude frequency characteristic curve 13, the convex characteristic remains in the frequency range used as the amplitude frequency characteristic after the amplitude compensation. It is difficult to obtain sufficient compensation.

On the other hand, in the amplitude frequency characteristic compensation circuit described later as an example of the embodiment of the present invention, as shown in FIG. 3, a concave shape sufficiently steep with respect to the convex amplitude frequency characteristic to be compensated. It has the amplitude frequency characteristics of. FIG. 3 shows after amplitude compensation that compensates for the convex amplitude frequency characteristics of parts such as the general semiconductor amplifier shown in FIG. 1 by using a compensation circuit having a sufficiently steep concave amplitude frequency characteristic. It is a characteristic figure which shows an example of the amplitude frequency characteristic. Here, as the compensation circuit, an example in which the amplitude frequency characteristic compensation circuit described later is used as an example of the embodiment of the present invention is shown. In FIG. 3, the convex amplitude frequency characteristic shown in FIG. 1 is shown by the amplitude frequency characteristic curve 11 of the actual gland, and one example of the sufficiently steep concave amplitude frequency characteristic of the compensation circuit of the example of the present invention is shown. The amplitude frequency characteristic curve 14 of the chain line is shown, and the amplitude frequency characteristic after the amplitude compensation using the compensation circuit is shown by the amplitude frequency characteristic curve 15 of the broken line.

As shown in the amplitude frequency characteristic curve 14 of FIG. 3, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit described later as an example of the embodiment of the present invention is that of a semiconductor amplifier or the like as shown in the amplitude frequency characteristic curve 11. Since the amplitude change at the time of frequency change is sufficiently steep with respect to the convex amplitude frequency characteristic, as shown in the amplitude frequency characteristic curve 15, the amplitude frequency characteristic after the amplitude compensation is within the frequency range used. In, a substantially flat characteristic can be realized, and sufficient compensation can be obtained.

The amplitude frequency characteristic curve 14 in FIG. 3 shows a case where the characteristics related to the variation in the characteristics of the circuit element such as a component are not adjusted, and when actually applied, the convex to be compensated. In some cases, it is not possible to realize the flat characteristics shown in the amplitude frequency characteristic curve 15 due to the variation in the amplitude frequency characteristics of the shape of the circuit element such as a component. In FIG. 4, a frequency shift occurs due to a variation in the characteristics of circuit elements such as components in the convex amplitude frequency characteristics to be compensated by the compensation circuit having the concave amplitude frequency characteristic curve 14 shown in FIG. It is a characteristic diagram which shows an example of the amplitude frequency characteristic after the amplitude compensation of the case, and the convex amplitude frequency characteristic of the radio signal to be compensated is frequency-shifted to the high frequency side, for example, due to the variation of the characteristic which a circuit element such as a component has. It shows the case where.

Here, in the characteristic diagram of FIG. 4, although the compensation circuit has the steep concave amplitude frequency characteristic shown in the amplitude frequency characteristic curve 14 of FIG. 3, as described above, the circuit of parts and the like. The case where the frequency characteristic with respect to the variation of the characteristic which the element has is not adjusted is shown. On the other hand, the convex amplitude frequency characteristic of the radio signal to be compensated is not the same as the amplitude frequency characteristic curve 11 shown in FIG. 3, as described above, and is due to the variation in the characteristics of circuit elements such as components. For example, the case where the amplitude frequency characteristic curve 16 is frequency-shifted to the high frequency side is shown.

That is, as shown in the amplitude frequency characteristic curve 14 of FIG. 4, the amplitude frequency characteristic of the compensation circuit has a sufficiently steep amplitude change at the time of frequency change with respect to the convex amplitude frequency characteristic of a semiconductor amplifier or the like. However, as shown in the amplitude frequency characteristic curve 16, the convex amplitude frequency characteristic to be compensated is frequency-shifted to the high frequency side. Therefore, as shown in the amplitude frequency characteristic curve 17, the amplitude frequency characteristic after the amplitude compensation is in an upward-sloping state within the frequency range to be used, and a flat characteristic cannot be realized.

On the other hand, in the amplitude frequency characteristic compensation circuit described later as an example of the embodiment of the present invention, as shown in FIG. 5, the amplitude of FIG. 4 corresponds to the frequency shift of the convex amplitude frequency characteristic to be compensated. It is possible to adjust and compensate the amplitude frequency characteristic shown in the frequency characteristic curve 14. FIG. 5 shows a convex amplitude frequency characteristic whose frequency is shifted due to a variation in the characteristics of circuit elements such as the components shown in the amplitude frequency characteristic curve 16 of FIG. 4 by using a compensation circuit having an amplitude frequency characteristic adjustment function. It is a characteristic diagram which shows an example of the amplitude frequency characteristic after compensation amplitude compensation. Here, as the compensation circuit, an example in which the amplitude frequency characteristic compensation circuit described later is used as an example of the embodiment of the present invention is shown.

In FIG. 5, the convex amplitude frequency characteristic frequency-shifted to the high frequency side is shown by the amplitude frequency characteristic curve 16 of the actual gland, and the amplitude of FIG. 4 is adjusted by the amplitude frequency characteristic adjustment function of the compensation circuit of the example of the present invention. An example of the concave amplitude frequency characteristic adjusted so that the frequency characteristic curve 14 is frequency-shifted to the high frequency side is shown by the one-point chain line amplitude frequency characteristic curve 18, and the amplitude frequency characteristic after the amplitude compensation using the compensation circuit is shown. It is shown by the amplitude frequency characteristic curve 19 of the broken line.

As shown in the amplitude frequency characteristic curve 18 of FIG. 5, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit described later as an example of the embodiment of the present invention is a circuit such as a component as shown in the amplitude frequency characteristic curve 16. Since the amplitude frequency characteristic curve 14 of FIG. 4 is adjusted to be a frequency shift in accordance with the convex amplitude frequency characteristic whose frequency is shifted to the high frequency side due to the variation in the characteristics of the element, the amplitude frequency characteristic curve 19 As shown in the above, even if the frequency shift occurs in the amplitude frequency characteristics of the radio signal to be compensated due to the variation in the characteristics of the circuit elements such as parts, it is used as the amplitude frequency characteristics after the amplitude compensation. In the frequency range, almost flat characteristics can be realized, and sufficient compensation can be obtained.

(Structure Example of Embodiment of this Invention)
Next, an example of the configuration of the amplitude frequency characteristic compensation circuit according to the embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block configuration diagram showing an example of the internal configuration of the amplitude frequency characteristic compensation circuit according to the embodiment of the present invention, with respect to a main line for radio signal propagation formed on a dielectric substrate such as an alumina substrate. A detailed configuration example of a stub composed of resistors connected in parallel, a plurality of wires, and a plurality of wire bonding patterns is shown.

That is, the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 has a stub 3 connected in parallel to the main line 2 for radio signal propagation formed on the dielectric substrate 1 as shown by being surrounded by a broken line. It is composed. The stub 3 is formed by a resistor 4, a plurality of wire bonding patterns 5, and a plurality of wires 6 (6a, 6b, 6c, 6d, 6e, 6f) connecting between the wire bonding patterns 5 and the most advanced portion. Is open. By arranging the plurality of wire bonding patterns 5 in the stub 3, the plurality of wires 6 to be used can be arranged at desired arbitrary positions and connected by wire bonding.

The resistor 4 directly connected to the main line 2 for radio signal propagation is formed by using, for example, a film resistor. Further, each wire bonding pattern 5 is arranged so as to form an appropriate pattern on the dielectric substrate 1 using a material capable of wire bonding each wire 6, and realizes a steep amplitude frequency characteristic. Form the stub 3. Each of the wires 6 connecting the wire bonding patterns 5 is formed by using a material having a large inductance value, and a part of each wire 6 has a plurality of the same two wire bonding patterns 5 in parallel. The other wires 6 are connected to each other by using adjacent wire bonding patterns 5 one by one.

Here, the tip side in the stub 3 is connected to the plurality of wire bonding patterns 5 arranged on the tip side in the stub 3 by using one wire 6 having a short length. It is formed in a state where a plurality of wires 6 having a short length are connected in series. The wire bonding pattern 5 for connecting a plurality of wires 6 in parallel is arranged at an appropriate arbitrary position in the stub 3 except for the tip side. Regarding the total line length of the stub 3 formed according to the frequency band of the radio signal to be compensated, the total line length of the stub 3 from the resistor 4 to the state-of-the-art wire bonding pattern 5 of the stub 3 is the total line length of the stub 3. , The length at which resonance occurs at a predetermined desired frequency is set, and in order to realize a high Q value as a resonance circuit and realize a steeper amplitude frequency characteristic, among the total line lengths of the stub 3. , The wire 6 is formed so as to occupy at least 50% or more.

In FIG. 6, the plurality of wires 6 forming the stub 3 and the wire bonding pattern 5 are stubs from the first-stage wire 6 bonded to the first-stage wire bonding pattern 5 directly connected to the resistor 4. A configuration example in which the wire bonding patterns 5 are connected in order in 6 steps toward the tip of 3 is shown, and for each of the plurality of wires 6, the first wire 6a, the second wire 6b, and the first wire 6b are shown in order. It is indicated as 3 wire 6c, 4th wire 6d, 5th wire 6e, and 6th wire 6f. Then, as described above, the total line length obtained by totaling the lengths of the first wire 6a, the second wire 6b, the third wire 6c, the fourth wire 6d, the fifth wire 6e, and the sixth wire 6f is a stub. It is at least 50% or more of the total gland length of 3.

In the configuration example shown in FIG. 6, the wire bonding pattern 5 for connecting the plurality of wires 6 in parallel is arranged between the wire bonding patterns 5 between the second and third stages. An example is shown showing a case where the number of wires of the second wire 6b of the second stage for connecting the wire bonding patterns 5 of the second stage and the third stage in parallel is set to three. Then, the 4th wire 6d and the 5th wire 6e connecting between the wire bonding patterns 5 from the 4th stage wire bonding pattern 5 to the state-of-the-art 7th stage wire bonding pattern 5 are reached. For each of the sixth wires 6f, a case is shown in which one wire 6 having a short length is used and each short wire 6 is set in a state of being connected in series.

Further, the arrangement example of the wire bonding pattern 5 and the wire 6 of the stub 3 of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 shows an example, and it is possible to obtain the highest possible Q value as a resonance circuit. If it is in such a state, it is not limited to such an arrangement. That is, there are no special restrictions on the orientation of the wire 6 and the shape of the wire bonding pattern 5, and the degree of freedom is high, and the wires may be arranged in any state. Therefore, it is possible to reduce the size of the amplitude frequency characteristic compensation circuit 10 by arranging the wire bonding pattern 5 and the wire 6 so as to reduce the occupied area occupied by the stub 3.

(Explanation of Operation Example of Embodiment of the Present Invention)
Next, an example of the operation of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 as an example of the embodiment of the present invention will be described in detail. FIG. 7 is a circuit diagram showing an equivalent circuit of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 as an example of the embodiment of the present invention.

As shown in the equivalent circuit of FIG. 7, the resistor 4 forming the stub 3 of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6, the plurality of wire bonding patterns 5, and the plurality of wires 6 are equivalently radio signals. It is a circuit in which each element of inductance 7 and capacitance 8 is connected in series to a resistor 4 connected in parallel to the main line 2 for propagation, and a series resonance circuit (LC series resonance) by the resistor 4, inductance 7, and capacitance 8. It can be regarded as forming a circuit). The resonance frequency (ω ₀ ) and Q value (Q ₀ ) of the series resonant circuit can be expressed by the following equations (1) and (2), respectively.

As the amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10, the convex amplitude frequency characteristic of a component such as a semiconductor amplifier or the amplitude ripple caused by impedance mismatch or the like is compensated for when the frequency changes. In order to make the change in amplitude characteristics steep, it is necessary to increase the _{Q value (Q 0).} That is, as shown in the equation (2), when the resonance frequency (ω ₀ ) is constant, it is necessary that the inductance component value (L) is large and the capacitance component value (C) is small. .. In the amplitude frequency characteristic compensation circuit 10 shown in FIG. 1, the wire bonding patterns 5 and 6 are _{arranged at appropriate positions where the Q value (Q 0} ) of the series resonant circuit can be made as large as possible. Further, the wire 6 occupying at least 50% or more of the total length of the stub 3 may be configured by using a wire having a large inductance value. As a result, the Q value (Q ₀ ) of the series resonant circuit can be increased, and a steep change in the amplitude characteristic can be realized as the amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10, and a semiconductor amplifier or the like can be used. It is possible to compensate for the convex amplitude frequency characteristic of the component.

Next, in order to compensate for the frequency shift of the convex amplitude frequency characteristic caused by the variation in the characteristics of the circuit element such as a component, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 is adjusted. The adjusting means for shifting the frequency to an appropriate frequency will be described. First, a case where the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 is frequency-shifted to the low frequency side will be described. FIG. 8 is an explanatory diagram illustrating an example of an adjusting means for adjusting the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 so as to shift the frequency to an appropriate frequency on the low frequency side.

As shown in FIG. 8, a plurality of wires 6 in which the same wire bonding patterns 5 are connected in parallel (for example, the wire bonding patterns 5 between the second and third stages are connected in parallel). By cutting a part of the wires (one or more wires) of the three second wires 6b) in the second stage, the peak value of the concave amplitude frequency characteristic can be frequency-shifted to the low frequency side. ..

That is, the combined inductance value of the plurality of wires 6 connected in parallel changes in the direction of becoming larger by cutting a part of the wires of the plurality of wires 6, and thus, as shown in the equation (1). _{, The resonance frequency (ω 0} ) of the series resonant circuit forming the stub 3 changes in the lower direction. Therefore, by adjusting the number of cuts of the plurality of wires 6 connected in parallel, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 can be frequency-shifted to an appropriate frequency on the low frequency side.

Next, a case where the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 is frequency-shifted to the high frequency side will be described. FIG. 9 is an explanatory diagram illustrating an example of an adjusting means for adjusting the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 so as to shift the frequency to an appropriate frequency on the high frequency side.

One wire 6 having a short length connecting each of the plurality of wire bonding patterns 5 arranged on the tip side in the stub 3 in series is a wire at an appropriate position (for example, as shown in FIG. 9). By cutting the sixth wire 6f) located at the most advanced end of the stub 3, the peak value of the concave amplitude frequency characteristic can be frequency-shifted to the high frequency side.

That is, the combined inductance value of the plurality of short wires 6 connected in series changes in the direction of becoming smaller by cutting the wire at any of the plurality of short wires 6, so that the equation (1) is used. As shown, the resonance frequency (ω ₀ ) of the series resonant circuit forming the stub 3 changes in the higher direction. Therefore, by adjusting the cut portion of the plurality of short wires 6 connected in series, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 can be frequency-shifted to an appropriate frequency on the high frequency side.

_{As described above, the resonance frequency (ω 0} ) of the series resonant circuit forming the stub 3 is set to the low frequency side by simply cutting the wire 6 connecting the wire bonding patterns 5. Since it is possible to adjust the frequency to shift to a desired appropriate frequency in any direction on the high frequency side, the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10 can be easily adjusted. be able to. Further, in adjusting the concave amplitude frequency characteristic of the amplitude frequency characteristic compensation circuit 10, it is not necessary to insert a special circuit element in order to change the inductance component value. Therefore, the amplitude frequency characteristic adjusting means. There is no increase in the cost to realize.

(Explanation of the effect of the embodiment)
As described in detail above, the following effects can be achieved in the present embodiment.

First, in the amplitude frequency characteristic compensation circuit 10, the convex amplitude frequency characteristic of a semiconductor amplifier or the like, or the steep concave amplitude frequency sufficient to compensate for the amplitude ripple caused by impedance mismatch or the like. Since there is no need to make any special restrictions on the orientation of the wire 6 forming the stub 3, the shape of the wire bonding pattern 5, etc., and the degree of freedom in layout is high, the circuit should be miniaturized. Is possible.

Secondly, in the amplitude frequency characteristic compensation circuit 10, in order to cope with the variation in the characteristics of circuit elements such as parts, the amplitude frequency characteristics can be obtained only by cutting a part of the wires constituting the stub 3. Since it can be easily adjusted and it is not necessary to additionally insert a new circuit element, it can be adjusted at low cost.

(Other Embodiments of the present invention)
By converting the resistor 4 constituting the stub 3 shown in FIG. 6 as the amplitude frequency characteristic compensation circuit 10 in the above-described embodiment into a variable resistance value, and by using the resistance 4 having a variable resistance value, the amplitude of the concave shape is concave. The peak value of the frequency characteristic may be adjustable. As a result, it becomes possible to more accurately compensate for the convex amplitude frequency characteristics of a semiconductor amplifier or the like, or the amplitude ripple caused by impedance mismatch or the like. FIG. 10 is a block configuration diagram showing another example of the internal configuration of the amplitude frequency characteristic compensation circuit according to the present invention, which is different from FIG. 6, and as an example, a single resistor 4 in the stub 3 shown in FIG. Instead of, the case where a plurality of resistors are connected in series and connected in series via a plurality of wire bonding patterns 5 is shown.

In the amplitude frequency characteristic compensation circuit 10a shown in FIG. 10, two resistors 41 and 42 are connected in series as a plurality of resistors connected in series via each of the plurality of wire bonding patterns 5. An example is shown. Then, when trying to variably set a desired resistance value in order to adjust the peak value of the concave amplitude frequency characteristic, a plurality of resistors connected in series (first resistance 41, second resistance 42). It is possible to realize by using means such as strapping so that any one or more of the above resistors are bypassed by wire bonding.

Further, the amplitude frequency characteristic compensation circuit 10 shown in FIG. 6 or the amplitude frequency characteristic compensation circuit 10a shown in FIG. 10 is installed in a desired frequency band specified in advance in order to improve the reflection characteristics (that is, (λ / 4)) (that is,). It is also possible to configure a plurality of stages to be connected via a line having a line length in the vicinity of (1/4 wavelength).

The configuration of a preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely exemplary of the invention and do not limit the invention in any way. Those skilled in the art can easily understand that various modifications can be made according to a specific application without departing from the gist of the present invention.

1 Dielectric substrate 2 Main line for radio signal propagation 3 Stub 4 Resistance 5 Wire bonding pattern 6 Wire 6a 1st wire 6b 2nd wire 6c 3rd wire 6d 4th wire 6e 5th wire 6f 6th wire 10 oscillating frequency Characteristic compensation circuit 10a Fluctuation frequency characteristic compensation circuit 11 Convex amplitude frequency characteristic curve 12 λ / 4 open stub compensation circuit of components such as semiconductor amplifier Concave amplitude frequency characteristic curve 13 λ / 4 open stub compensation circuit The amplitude frequency characteristic curve after amplitude compensation used 14 The sufficiently steep concave amplitude frequency characteristic curve of the compensation circuit of the example of the present invention 15 The amplitude frequency characteristic curve after the amplitude compensation using the compensation circuit of the example of the present invention 16 Convex amplitude frequency characteristic curve frequency-shifted due to characteristic variation of parts, etc. 17 Frequency characteristic curve after amplitude compensation using the compensation circuit of the example of the present invention 18 After adjustment performed by the compensation circuit of the example of the present invention Concave amplitude frequency characteristic curve 19 Vibration frequency characteristic curve after amplitude compensation using the compensation circuit of the example of the present invention 41 First resistance 42 Second resistance

Claims (10)

In the amplitude frequency characteristic compensation circuit that compensates for the amplitude frequency characteristic of the propagating radio signal,
It has a stub connected in parallel to the main line for wireless signal propagation.
The stub is
It consists of a resistor directly connected to the main line, a plurality of wires, and a plurality of wire bonding patterns for bonding between the resistor and any one of the wires and between the wires.
And,
A series resonance circuit is formed by setting the total line length from the resistor to the wire bonding pattern located at the tip in the stub to a length that resonates at a predetermined desired frequency.
And,
By arranging the wire and the wire bonding pattern so that the Q value of the formed series resonant circuit becomes a large value, the concave amplitude frequency characteristic is set to a steep characteristic.
Amplitude frequency characteristic compensation circuit characterized by this. At least 50% or more of the total wire length from the resistor to the wire bonding pattern located at the tip in the stub is occupied by the lengths of the plurality of wires.
The amplitude frequency characteristic compensation circuit according to claim 1. Among the plurality of wires connecting the plurality of the wire bonding patterns, the connections between the wire bonding patterns arranged at any position other than the tip end side of the stub are connected in parallel by the plurality of wires. The connection is made, and the connection between each of the plurality of wire bonding patterns arranged on the tip side of the stub is a series connection by the wires having a length shorter than that of the wires of the parallel connection.
By cutting either a part of the wires of the parallel connection or the wires of the series connection according to the frequency shift of the convex frequency characteristic to be compensated, the concave amplitude frequency characteristic is frequency-shifted. I'm letting you
The amplitude frequency characteristic compensation circuit according to claim 1 or 2. The amplitude frequency characteristic compensation circuit according to any one of claims 1 to 3, wherein the resistor forming the stub is composed of a plurality of resistors connected in series. A configuration in which a plurality of stages of the amplitude frequency characteristic compensation circuits according to any one of claims 1 to 4 are connected via a line having a line length in the vicinity of 1/4 wavelength in a desired frequency band specified in advance.
Amplitude frequency characteristic compensation circuit characterized by this. A radio device having an amplitude frequency characteristic compensation circuit that compensates for the amplitude frequency characteristics of a propagating radio signal.
The amplitude frequency characteristic compensation circuit is configured by using the amplitude frequency characteristic compensation circuit according to any one of claims 1 to 5.
A wireless device characterized by that. This is an amplitude-frequency characteristic compensation method that compensates for the amplitude-frequency characteristics of the propagating radio signal.
It has a stub connected in parallel to the main line for wireless signal propagation.
The stub is
It consists of a resistor directly connected to the main line, a plurality of wires, and a plurality of wire bonding patterns for bonding between the resistor and any one of the wires and between the wires.
And,
A series resonance circuit is formed by setting the total line length from the resistor to the wire bonding pattern located at the tip in the stub to a length that resonates at a predetermined desired frequency.
By arranging the wire and the wire bonding pattern so that the Q value of the formed series resonant circuit becomes a large value, the concave amplitude frequency characteristic is set to a steep characteristic.
A method for compensating for amplitude frequency characteristics. The length of the plurality of wires occupies at least 50% or more of the total wire length from the resistor to the wire bonding pattern located at the tip in the stub.
The amplitude frequency characteristic compensation method according to claim 7. Among the plurality of wires connecting the plurality of the wire bonding patterns, the connections between the wire bonding patterns arranged at any position other than the tip end side of the stub are connected in parallel by the plurality of wires. The connection is made, and the connection between each of the plurality of wire bonding patterns arranged on the tip side of the stub is a series connection by the wires having a length shorter than that of the wires of the parallel connection.
The concave amplitude frequency characteristic is frequency-shifted by cutting either a part of the parallel-connected wire or the series-connected wire according to the frequency shift of the convex frequency characteristic to be compensated. Let,
The amplitude frequency characteristic compensation method according to claim 7 or 8. The resistors forming the stub are composed of a plurality of resistors connected in series, and when adjusting the peak value of the concave amplitude frequency characteristic in the self-amplitude frequency characteristic compensation circuit, the plurality of resistors connected in series The resistance value is changed to any desired resistance value by strapping any one or more so as to be bypassed by wire bonding.
The amplitude frequency characteristic compensation method according to any one of claims 7 to 9.

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