KR101670336B1 - linear power amplifier for high frequency ultrasound imaging system - Google Patents
linear power amplifier for high frequency ultrasound imaging system Download PDFInfo
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- KR101670336B1 KR101670336B1 KR1020150141072A KR20150141072A KR101670336B1 KR 101670336 B1 KR101670336 B1 KR 101670336B1 KR 1020150141072 A KR1020150141072 A KR 1020150141072A KR 20150141072 A KR20150141072 A KR 20150141072A KR 101670336 B1 KR101670336 B1 KR 101670336B1
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- power amplifier
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
- A61B8/4494—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer characterised by the arrangement of the transducer elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/56—Details of data transmission or power supply
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Abstract
Description
The present invention relates to a power amplifier linearizer for a high-frequency imaging ultrasound system, and more particularly, to a high-frequency imaging apparatus for improving the linearity of a power amplifier in order to improve the performance of a high- ≪ / RTI > The present invention relates to a power amplifier linear element for an ultrasound system.
Medical Ultrasound Imaging Systems is a system that uses ultrasonic transducer (ultrasonic transducer) to transmit the audible frequency (over 20kHz) ultrasonic signal to the inside of the human body and animal and displays the structural image through diffusion, reflection, absorption and scattering. It is an imaging diagnostic medical device that provides.
Ultrasonic transducers are divided into single transducer with one part and array transducer with several parts.
On the other hand, the quality of the ultrasound image is largely influenced by the ultrasonic probe, and the role of the power amplifier among the electronic components included in the ultrasound system plays the most important role in operating the ultrasonic image.
Therefore, the design of a good power amplifier has a significant impact on the performance of the entire high-frequency imaging ultrasound system.
As shown in FIG. 1, a high-voltage high-frequency power amplifier is used to provide a strong output of a high-frequency image ultrasonic probe, and a high-voltage power amplifier output is required in a low-sensitivity high-
It therefore depends on how linearly the signal is amplified in a power amplifier operating at high voltage and high frequency.
The output of the power amplifier tries to increase the output of the power amplifier to reach the saturation state when the input is increased.
Therefore, in order to improve the linearity of the power amplifier, it is necessary to design a dedicated power amplifier linear element.
That is, if the power amplifier dedicated linear element is constructed as described in FIG. 1, the saturation point will be shifted to the right.
SUMMARY OF THE INVENTION It is an object of the present invention to improve the linearity of a power amplifier in order to improve the performance of a high-frequency image ultrasonic probe, thereby generating a stronger power amplifier output, So that the image quality of the image ultrasound can be improved.
According to an aspect of the present invention, there is provided a power amplifier linearizer for a high-frequency image ultrasound system,
And the output voltage of the power amplifier is regulated by adjusting the input voltage of the power amplifier at the front stage of the power amplifier.
At this time, the power amplifier linear-
An external capacitance Co;
A resistor (Ro) connected in series with an external capacitance for supplying a bias voltage through a DC power supply;
A transistor TRo comprised of a parasitic gate-source capacitor Cgs, a drain-source capacitance Cds, and a gate-drain capacitance Cgd;
And an RF choke inductor (Lo) connected in series with the transistor so as not to reduce the gain of the arc.
The power amplifier linearizer for the high-frequency image ultrasound system according to the present invention having the above-described structure and function improves the linearity of the power amplifier to improve the performance of the high-frequency image ultrasonic probe, thereby generating a stronger power amplifier output, The linear strong output serves to attenuate the harmonic component of the output, which ultimately helps produce a more accurate and effective output of the high-frequency image transducer.
Therefore, the effect of improving the image quality of the high-frequency image ultrasonic waves is exerted.
1 is an exemplary view showing a saturation point of a power amplifier.
2 is a schematic block diagram of a power amplifier linear for a high frequency imaging ultrasound system in accordance with an embodiment of the present invention.
FIG. 3 is a photograph showing liver damage areas of cattle produced by controlled high-intensity ultrasound.
FIG. 4 is a linear circuit diagram of a power amplifier linearizer for a high-frequency image ultrasound system according to an embodiment of the present invention, and FIG. 5 is a circuit diagram of a general power amplifier.
FIG. 6 is a graph illustrating a linear operation of a power amplifier linearizer for a high-frequency imaging ultrasound system according to an exemplary embodiment of the present invention, and FIG. 7 is a graph illustrating improvement of a maximum linear output point.
FIG. 8 is a graph comparing a case where a power amplifier linear device is included for a high-frequency image ultrasound system according to an embodiment of the present invention and a case where a power amplifier linear device is not included.
The following merely illustrates the principles of the invention. Therefore, those skilled in the art will be able to devise various apparatuses which, although not explicitly described or illustrated herein, embody the principles of the invention and are included in the concept and scope of the invention.
Furthermore, all of the conditional terms and embodiments listed herein are, in principle, only intended for the purpose of enabling understanding of the concepts of the present invention, and are not to be construed as limited to such specifically recited embodiments and conditions do.
It is also to be understood that the detailed description, as well as the principles, aspects and embodiments of the invention, as well as specific embodiments thereof, are intended to cover structural and functional equivalents thereof.
It is also to be understood that such equivalents include all elements contemplated to perform the same function irrespective of currently known equivalents as well as equivalents to be developed in the future.
Hereinafter, embodiments of a power amplifier linear type for a high-frequency image ultrasound system according to the present invention will be described in detail.
2 is a schematic block diagram of a power amplifier linear for a high frequency imaging ultrasound system in accordance with an embodiment of the present invention.
As shown in FIG. 2, the power amplifier linearizer for the high-frequency image ultrasound system of the present invention includes a linear element at the front end of the power amplifier to adjust the input voltage of the power amplifier to control the output voltage of the power amplifier.
FIG. 3 is a photograph showing liver damage areas of cattle produced by controlled high-intensity ultrasound.
As shown in FIG. 3, the existing high-intensity focused ultrasound diagnostic apparatus has a disadvantage that the precise therapeutic effect is attenuated. Therefore, it is known that the possibility of generating bubbles in a living tissue is high, Zhou, Ultrasonics, 2013 '.
This is a typical side effect of patients who want to treat cancer cells using high-frequency integrated ultrasound.
Therefore, it is necessary to improve the performance of the power amplifier, which plays a decisive role in the ultrasound system. By using the linear power amplifier with linear power, the high intensity focused ultrasound system can also improve the therapeutic effect. have.
The reason for this is that the high-frequency imaging ultrasound probe has a more linear output (ie, less harmonic content) that regulates the more precise output of the cell to be treated and minimizes the patient's side effects Because.
FIG. 4 is a linear circuit diagram of a power amplifier linearizer for a high-frequency image ultrasound system according to an embodiment of the present invention, and FIG. 5 is a circuit diagram of a power amplifier.
As shown in FIG. 4, the power amplifier linear type for the high-frequency image ultrasound system of the present invention is configured at the front end of the power amplifier to adjust the input voltage of the power amplifier to control the output voltage of the power amplifier.
At this time, the power amplifier linear-
An external capacitance Co;
A resistor (Ro) connected in series with an external capacitance for supplying a bias voltage through a DC power supply;
A transistor TRo comprised of a parasitic gate-source capacitor Cgs, a drain-source capacitance Cds, and a gate-drain capacitance Cgd;
And an RF choke inductor (Lo) connected in series with the transistor so as not to reduce the gain of the arc.
Specifically, the total capacitor value is composed of an external capacitance Co value and a parasitic gate-source capacitor, a drain-source capacitance, and a gate-drain capacitance Cgs, Cds, and Cgd of the transistor TR0.
The total value of the above capacitance (Co + Cgs + Cds + Cgd) should be selected to reproduce an appropriate harmonic signal at each power level.
At this time, the value of the resistor (Ro) providing the bias voltage through the DC power supply is selected so as not to deteriorate the noise figure.
Alternatively, the appropriate RF choke inductor (Lo) value should be chosen to avoid reducing the gain of the call.
Then, the gate-source DC voltage Vdco of the transistor TRo affects the drain-source current ID and eventually affects the transistor transconductance value Gm.
Therefore, the parts of the entire linear magnetic circuit should be selected appropriately, and the gate-source DC voltage (Vdco) supplying the voltage should be selected according to the respective power levels.
As described above, the total component values of all linear magnetic circuits must be selected in order to eliminate the proper harmonic signal of the power amplifier in accordance with each power level, because they affect each other.
5, L1, C1, C2, L2 and R1 are input power matching circuits, and C3, C4, R4, L4 and L5 are output power matching circuits.
Vdc1 and Vdc2 are a DC bias voltage for controlling the transistor TR1, and R2 is a bias resistor R2 used for preventing current from flowing in Vdc1.
Using the appropriately selected values, 15dB gain, center frequency 200MHz, -3dB bandwidth is implemented at 240MHz.
For example, in the linearization circuit of the power amplifier, an artificial secondary and tertiary harmonic components (HD2 and HD3) are generated to attenuate the secondary and tertiary harmonic components (HD2 and HD3) generated by the main power amplifier It is a predistortion linear circuit to be set.
To do this, we first measure the second and third harmonic components of the power amplifier, and then select the component value and the bias voltage of the predistortion linear circuit to generate the opposite harmonic component of the power amplifier.
FIG. 6 is a graph illustrating a linear operation of a power amplifier linearizer for a high-frequency imaging ultrasound system according to an exemplary embodiment of the present invention, and FIG. 7 is a graph illustrating improvement of a maximum linear output point.
As shown in FIG. 6, the attenuation of the harmonic component HD2 = -61 dB was confirmed, and it was found that the linear self-power amplifier operates more linearly.
As shown in FIG. 7, it is found that the performance of the output power is decreased by 1 dB according to the input power, and the maximum linear output point OP1dB is improved.
FIG. 8 is a graph comparing a case where a power amplifier linear device is included for a high-frequency image ultrasound system according to an embodiment of the present invention and a case where a power amplifier linear device is not included.
FIG. 8 shows a comparison between a case where a linearizer is attached and a case where a linearizer is attached in order to be applied to an actual high-frequency medical ultrasound imaging system. The output of the echo appears in a frequency domain. This is because the harmonic component HD2 attenuates .
As described above, it is expected that the diagnosis accuracy of disease can be improved by enhancing the effect of obtaining a high resolution image through an ultrasound image probe and treating a high intensity intensive ultrasound with high precision.
In addition, the representative problem of high-intensity integrated ultrasound is that ultrasound can not break cancer cell tissue. However, when constructed according to the present invention, the whole high-intensity integrated ultrasound therapy and accurate imaging can be performed, The effect is improved.
In addition, it is applicable to low power system, and it can be applied to more complicated high frequency medical image ultrasound system. It provides scalability to simultaneously reduce odd and even (harmonics 2 and 3) harmonics, You can expect to see performance improvements in devices, mobile, mobile phones, and communication systems.
Meanwhile, the research and development direction of the medical ultrasound device is going to be portable, and since the performance of the battery is greatly influenced, it is highly likely that a low power such as a mobile phone is required, so that it can be used in a portable medical ultrasound system requiring low power and high performance.
This is because a simple design structure of an integrated small chip structure is possible.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.
Co: External capacitance
Ro: Resistance
TRo: transistor
Lo: RF choke inductor
Claims (11)
And a power amplifier linear element formed at the front end of the power amplifier to adjust the input voltage of the power amplifier to adjust the output voltage of the power amplifier,
The power amplifier linearizer includes:
An external capacitance Co;
And a resistor (R0) connected in series with an external capacitance for supplying a bias voltage through a DC power supply. The power amplifier linearizer for a high-frequency image ultrasound system according to claim 1,
And a power amplifier linear element formed at the front end of the power amplifier to adjust the input voltage of the power amplifier to adjust the output voltage of the power amplifier,
The power amplifier linearizer includes:
An external capacitance Co;
A resistor (Ro) connected in series with an external capacitance for supplying a bias voltage through a DC power supply;
A transistor TRo comprised of a parasitic gate-source capacitor Cgs, a drain-source capacitance Cds, and a gate-drain capacitance Cgd;
And a RF choke inductor (Lo) connected in series with the transistor so as not to reduce the gain of the arc.
And a power amplifier linear element formed at the front end of the power amplifier to adjust the input voltage of the power amplifier to adjust the output voltage of the power amplifier,
The power amplifier linearizer includes:
An external capacitance Co;
A resistor (Ro) connected in series with an external capacitance for supplying a bias voltage through a DC power supply;
A transistor TRo comprised of a parasitic gate-source capacitor Cgs, a drain-source capacitance Cds, and a gate-drain capacitance Cgd;
And an RF choke inductor (Lo) connected in series with the transistor so as not to reduce the gain of the arc,
The total value of the capacitance (Co + Cgs + Cds + Cgd)
And is selected to reproduce a harmonic signal at each power level. ≪ Desc / Clms Page number 18 >
And a power amplifier linear element formed at the front end of the power amplifier to adjust the input voltage of the power amplifier to adjust the output voltage of the power amplifier,
The power amplifier linearizer includes:
An external capacitance Co;
A resistor (Ro) connected in series with an external capacitance for supplying a bias voltage through a DC power supply;
A transistor TRo comprised of a parasitic gate-source capacitor Cgs, a drain-source capacitance Cds, and a gate-drain capacitance Cgd;
And an RF choke inductor (Lo) connected in series with the transistor so as not to reduce the gain of the arc,
The RF choke inductor (Lo)
Wherein a value of the RF choke inductor (Lo) is selected so as not to reduce the gain of the call. The power amplifier linearizer for a high-frequency image ultrasound system.
The power amplifier linearizer includes:
A power amplifier linearizer for a high-frequency imaging ultrasound system, characterized in that the linearity of the power amplifier is improved to improve the performance of the high-frequency image ultrasonic probe, thereby generating a high power amplifier output.
The power amplifier linearizer includes:
Wherein the harmonic component of the linear output is attenuated.
The power amplifier linearizer includes:
A power amplifier linearizer for a high frequency imaging ultrasound system, characterized by being applied to a low power portable medical ultrasound system.
The power amplifier linearizer includes:
(2) and (3) harmonics can be attenuated at the same time. The power amplifier linearizer for a high-frequency image ultrasound system.
The power amplifier linearizer includes:
And the harmonic component is attenuated to -61 dB. The power amplifier linearizer for a high-frequency image ultrasound system.
The power amplifier linearizer includes:
And a maximum linear output point (OP1dB) is increased by 1dB of the output power depending on the input power, and a power amplifier linear type for the high-frequency image ultrasound system.
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| KR1020150141072A KR101670336B1 (en) | 2015-10-07 | 2015-10-07 | linear power amplifier for high frequency ultrasound imaging system |
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| KR1020150141072A KR101670336B1 (en) | 2015-10-07 | 2015-10-07 | linear power amplifier for high frequency ultrasound imaging system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000009734A (en) | 1998-07-28 | 2000-02-15 | 박호군 | Microwave semiconductor heat dissipator coated with diamond film and fabrication method thereof |
| KR20060097279A (en) * | 2005-03-04 | 2006-09-14 | 삼성전자주식회사 | Pre-distorter |
| US20130162349A1 (en) * | 2011-12-22 | 2013-06-27 | Southern Methodist University | Look-Up-Table Digital Predistortion Technique for High-Voltage Power Amplifiers in Ultrasonic Applications |
| KR20130137203A (en) * | 2011-01-06 | 2013-12-16 | 더루우브리졸코오포레이션 | Improvements in or relating to ultrasound generating apparatus, and methods for generating ultrasound |
| KR20150077851A (en) * | 2013-12-30 | 2015-07-08 | 삼성전기주식회사 | Power amplifier |
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- 2015-10-07 KR KR1020150141072A patent/KR101670336B1/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000009734A (en) | 1998-07-28 | 2000-02-15 | 박호군 | Microwave semiconductor heat dissipator coated with diamond film and fabrication method thereof |
| KR20060097279A (en) * | 2005-03-04 | 2006-09-14 | 삼성전자주식회사 | Pre-distorter |
| KR20130137203A (en) * | 2011-01-06 | 2013-12-16 | 더루우브리졸코오포레이션 | Improvements in or relating to ultrasound generating apparatus, and methods for generating ultrasound |
| US20130162349A1 (en) * | 2011-12-22 | 2013-06-27 | Southern Methodist University | Look-Up-Table Digital Predistortion Technique for High-Voltage Power Amplifiers in Ultrasonic Applications |
| KR20150077851A (en) * | 2013-12-30 | 2015-07-08 | 삼성전기주식회사 | Power amplifier |
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