• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a phase shifter used in a communication system, etc., comprising: a resistor (R1) connected to an input terminal to which a radio frequency signal is input, a resistor (R2) connected in series with the resistor (R1), FET Q1 having a drain terminal and a source terminal connected in parallel to the resistors R1 and R2, and a FET Q2 having a drain connected to a portion where the resistor R1 and the resistor R2 are connected. And a resistor R3 connected to the source terminal of the FET Q2, and a FET Q3 connected to the drain terminal of the source terminal of the FET Q2, and the FET of the high frequency phase shifter. By switching to, it is possible to operate as an all-pass / low-pass filter, significantly reducing the size and weight of the monolithic microwave integrated circuit (MMIC) using fewer passive and switching elements, thereby reducing the cost.
    公开号:KR19990071024A
    申请号:KR1019980006223
    申请日:1998-02-26
    公开日:1999-09-15
    发明作者:최병환；허창욱
    申请人:김영환；현대전자산업 주식회사；
    IPC主号:
    专利说明:

    Phase Shifter and Control Method with All-pass Filter and Low-pass Filter
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase shifter used in a communication system. Particularly, an all-pass filter and a low pass filter are implemented in one device so that they are switched with each other. The present invention relates to a phase shifter and a control method having the performance of an all-pass filter and a low-pass filter for varying the power.
    In general, a monolithic microwave integrated circuit (MMIC) is a microwave circuit for making an active passive device on a semiconductor substrate, and the MMIC collectively connects active devices and passive devices as well as unit devices on a mm substrate. At the same time, the production of a fixed microwave, as the development of the microwave in recent years, there is a problem that can not achieve a compact and lightweight high-frequency circuit in order to make the user easy to carry and use.
    An object of the present invention for solving the above problems, by using the characteristics of the all-pass / low pass filter to ensure that the all-pass filter has the characteristics of the phase advance and the low pass filter has a phase delay to transmit the input signal The present invention provides a phase shifter and a control method having an all-pass filter and a low-pass filter for controlling a phase by adjusting a path.
    The phase converter having the performance of the all-pass filter and the low-pass filter of the present invention for achieving the above object is a resistor (R1) connected to the input terminal to which the radio frequency signal is input, and the resistor (R1) A resistor R2 connected in series, a FET Q1 having a drain terminal and a source terminal connected in parallel with the resistors R1 and R2, and a resistor R1 and a resistor R2 connected to each other. FET Q2 having a drain connected to the portion, a resistor R3 connected to the source terminal of the FET Q2, and a FET Q3 having a drain terminal connected to the source terminal of the FET Q2. It is characterized in that connected to.
    The method of controlling a phase converter having the performance of the all-pass filter and the low-pass filter of the present invention configured as described above includes a field effect transistor (FET) in parallel to the resistors R1 and R2 connected to the input terminals to which the radio frequency signal is input. (Q1) is connected, the FET (Q2) is connected to the portion where the resistor (R1) and the resistor (R2) is connected, the resistor (R3) is connected to the source terminal of the FET (Q2), The FET Q3 is connected to the source terminal of the FET Q2 to apply different control signals to the gate terminals of the FETs Q1, Q2 and Q3 to operate as an all-pass filter and a low pass filter. It is done.
    1 is a circuit diagram of a phase converter having the performance of an all-pass filter and a low-pass filter of the present invention,
    2 is an equivalent circuit diagram when the present invention operates as an all-pass filter.
    3 is an equivalent circuit diagram when the present invention operates as a low pass filter.
    4 is a comparison graph of frequency performance when operating as an all-pass filter,
    5 is a comparative graph of frequency performance when operating as a low pass filter.
    Explanation of symbols for main parts of the drawings
    R1 to R12: resistors C1, C2, C3: capacitors
    Q1, Q2, Q3: FET
    The phase converter having the performance of the all-pass filter and the low-pass filter of the present invention will be described in detail with reference to the accompanying drawings.
    1 is a circuit diagram of a phase converter having the performance of an all-pass filter and a low-pass filter of the present invention, and is connected in series with a resistor R1 connected to an input terminal to which a radio frequency signal is input and the resistor R1. A resistor (R2) connected thereto, a FET (Q1) having a drain terminal and a source terminal connected in parallel to the resistor (R1) and the resistor (R2), and the resistor (R1) FET Q2 having a drain terminal connected to a portion where the resistor R2 is connected, a resistor R3 connected to a source terminal of the FET Q2, and a drain terminal at a source terminal of the FET Q2. Is connected to the connected FET Q3.
    At this time, the voltage input to the gate terminal of the FET Q1 and the FET Q2 and the signal input to the gate terminal of the FET Q3 are opposite to each other, for example, the FET Q1 and the FET. When turning on by applying 0V to the gate terminal of Q2, -3V is applied to the gate terminal of the FET Q3 to turn off, and conversely to the gate terminals of the FET Q1 and FET Q2. When turning off by applying 3V, 0V is applied to the gate terminal of the FET Q3 to turn on.
    Operation and effects on the phase shifter and the control method having the performance of the all-pass filter and the low-pass filter of the present invention configured as described above are as follows.
    When a radio frequency signal is input from the outside through the input terminal, when 0 V is applied to the gate terminals of the FET Q1 and the FET Q2 by a controller (not shown), the FET Q1 and the FET Q2 are When the FET Q1 and the FET Q2 become conductive in this way, -3V is applied to the gate terminal of the FET Q3 unlike the FET Q1 and the FET Q2. The FET Q3 is turned off, and the equivalent circuit for this operation is shown in FIG.
    That is, since the FET Q1 and the FET Q2 are conducted, the FET Q1 and the FET Q2 are equivalent to the resistor R4 and the resistor R12, respectively, and the FET Q3 is turned off so that the capacitor ( Equivalent to C1), the phase shifter functions as an all-pass filter.
    4 is a graph showing characteristics of an all-pass filter, (a) is a graph of insertion loss, (b) is a reflection coefficient indicating how reflected the input signal is, and (c) is a change in phase In the frequency band of about 30 GHz, the graph of (C) relating to the phase has a phase of about -50 degrees. And when the frequency of the horizontal axis is about 10GHz to about 40GHz, the graph of (A) is in the range of -0.3dB or more, so that the signal transmission is generally transmitted well in the range of all frequencies (exactly about 10GHz to 38GHz). In this case, it can be seen that the reflection coefficient of the graph (b) decreases rapidly in the above range so that the signal is transmitted well without being reflected.
    In contrast to the operation of the all-pass filter, when -3V is applied to the gate terminals of the FETs Q1 and FETs Q2, the FETs Q1 and FETs Q2 are turned off. When the FET Q1 and the FET Q2 are blocked in this manner, unlike the FET Q1 and the FET Q2, 0V is applied to the gate terminal of the FET Q3, thereby turning on the FET Q3. Thus, the equivalent circuit for this operation is as shown in FIG.
    That is, the FET Q1 and the FET Q2 are cut off to be equivalent to the capacitor C2 and the capacitor C3, and the FET Q3 is turned on so that it is equivalent to the resistor R11, so that the phase shifter is a low pass filter. Function as.
    The characteristics of the low pass filter are shown in FIG. 5. Compared with the all pass filter shown in FIG. 4, the graph (A) shows a low pass due to good signal transmission characteristics from 0 GHz to about 30 GHz. It functions as a filter, and in (b), in contrast to (a), the frequency has a bad reflection characteristic up to about 30GHz, and (c) has a phase value of about -120 ° in the frequency band of about 30GHz, In the all-pass filter of FIG. 4, it can be seen that the delay is -70 ° more than -50 °.
    In this way, by applying different voltages to the gate terminals of the FETs Q1, FETs Q2, and FETs Q3, these devices are turned on / off and switched so that these devices are equivalent to resistors or capacitors, thereby providing an all-pass filter. Or as a low pass filter.
    The phase shifter and the control method having the performance of the all-pass filter and the low-pass filter of the present invention configured as described above operate by switching the FET of the high frequency phase shifter to operate as an all-pass / low pass filter, thereby reducing the number of passive elements and switching. The device significantly reduces the size and weight of monolithic microwave integrated circuits (MMICs), thereby reducing the cost.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] A resistor R1 connected to an input terminal to which a radio frequency signal is input, a resistor R2 connected in series to the resistor R1, and a drain terminal and a source terminal in parallel with the resistors R1 and R2. FETs Q1 connected to each other, a FET Q2 having a drain connected to a portion where the resistor R1 and the resistor R2 are connected, and a resistor connected to a source terminal of the FET Q2. (R3) and a FET (Q3) having a drain terminal connected to the source terminal of the FET (Q2) phase converter having the performance of all-pass filter and low pass filter.
    [2" claim-type="Currently amended] The FET Q1 is connected in parallel to the resistors R1 and R2 connected to the input terminal to which the radio frequency signal is input, and the FET Q2 is connected to the portion where the resistor R1 and the resistor R2 are connected. The resistor R3 is connected to the source terminal of the FET Q2, and the FET Q3 is connected to the source terminal of the FET Q2 to provide different control signals to the gate terminals of the FETs Q1, Q2, and Q3. A method of controlling a phase converter having performances of an all-pass filter and a low-pass filter, characterized by operating as an all-pass filter or a low-pass filter by applying.
    [3" claim-type="Currently amended] The method of claim 2, wherein applying 0V to the gate terminals of the FET Q1 and the FET Q2 of the phase converter causes the FET Q1 and the FET Q2 to conduct, thereby causing a resistance R4. Equivalent to the over-resistance (R12), the FET (Q3) is turned off, so as to the condenser (C1) to operate as an all-pass filter, characterized in that the control method of the phase converter with the performance of the all-pass filter and low-pass filter .
    [4" claim-type="Currently amended] The method of claim 2, wherein applying -3V to the gate terminals of the FET Q1 and the FET Q2 of the phase converter causes the FET Q1 and the FET Q2 to be turned off and shut off, thereby condensing the capacitor. Equivalent to (C2) and condenser (C3), the FET (Q3) is turned on, so it is equivalent to the resistor (R11) to operate as a low pass filter characterized in that the phase converter having the performance of the all-pass filter and low pass filter Control method.
    [5" claim-type="Currently amended] 3. The performance of the all-pass filter and the low-pass filter according to claim 2, wherein the phase shifter generates a phase difference of about -70 degrees when operating as an all-pass filter. Control method of phase shifter with.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-02-26|Application filed by 김영환, 현대전자산업 주식회사
    1998-02-26|Priority to KR1019980006223A
    1999-09-15|Publication of KR19990071024A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980006223A|KR19990071024A|1998-02-26|1998-02-26|Phase Shifter and Control Method with All-pass Filter and Low-pass Filter|
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