JP2007081535A - Variable gain amplifier - Google Patents

Variable gain amplifier Download PDF

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JP2007081535A
JP2007081535A JP2005263799A JP2005263799A JP2007081535A JP 2007081535 A JP2007081535 A JP 2007081535A JP 2005263799 A JP2005263799 A JP 2005263799A JP 2005263799 A JP2005263799 A JP 2005263799A JP 2007081535 A JP2007081535 A JP 2007081535A
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input
amplifier
switch
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output switch
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Kazuhiro Sugafuji
和博 菅藤
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Toshiba Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable gain amplifier capable of stably operating by suppressing unwanted oscillation or the like of an amplifier. <P>SOLUTION: The variable gain amplifier consists of a 1-input 2-output switch for receiving an input high-frequency signal; a 2-input 1-output switch; an amplifier and a bypass line connected in parallel between an output terminal of the 1-input 2-output switch and an input terminal of the 2-input 1-output switch; a power source circuit for supplying power of the amplifier; and a power switch for performing control to turn on/off the supply of power of the power source circuit to the amplifier. When the 1-input 2-output switch and the 2-input 1-output switch are switched to the amplifier side, the power switch is turned on, and when the 1-input 2-output switch and the 2-input 1-output switch are switched to the bypass line side, the power switch is turned off. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、マイクロ波回路等に使用される可変利得増幅器に関する。   The present invention relates to a variable gain amplifier used in a microwave circuit or the like.

従来、移動通信などの高周波帯用高出力通信機器に用いられる高周波増幅器では、出力電力に応じて増幅器のバイアス条件を変えることにより消費電力の低減を図っていた。また、必要とされる出力が高い場合には上記増幅器を用い、低出力が必要とされる場合には、増幅器をバイパスするバイパス線路を設け、これに切り替えることによって信号を出力していた。しかし、上記バイパス線路を出力端子に接続していると、出力が変動したり歪が大きくなる問題があり、これを解決するために上記切り替え器と連動して増幅器を制御する制御回路やバイアス線路の出力端子側に方向性結合器を用いるものが知られている（例えば、特許文献１参照）。しかし、このような構成では方向性結合器が出力側に設けられているので結合度分の損失が発生する。   Conventionally, in a high-frequency amplifier used in a high-power communication device for a high-frequency band such as mobile communication, power consumption is reduced by changing a bias condition of the amplifier according to output power. Further, when the required output is high, the amplifier is used, and when the low output is required, a bypass line for bypassing the amplifier is provided and a signal is output by switching to this. However, when the bypass line is connected to the output terminal, there is a problem that the output fluctuates or distortion increases. To solve this problem, a control circuit or bias line that controls the amplifier in conjunction with the switch A device using a directional coupler on the output terminal side is known (for example, see Patent Document 1). However, in such a configuration, since the directional coupler is provided on the output side, a loss corresponding to the degree of coupling occurs.

また図２に示すように、増幅器とバイパス線路の入力端子側に切り替えスイッチを用いると共に、出力端子側にもスイッチを設けて上述の問題を解決しようとする構成のものも知られていた。即ち、入力信号をスイッチ１１とスイッチ１４により、増幅が必要な場合は電源回路１５からの電力供給を受ける可変利得増幅器１２側に接続し、信号を増幅して出力し、増幅が必要でない場合は、バイパス線路１３側に切り替えて増幅しないで信号を出力するものである。なお、入力として過大な信号が入ってくることが想定される場合には、バイパス線路の途中にアッテネータを入れることもある。   Further, as shown in FIG. 2, there has been known a configuration in which a changeover switch is used on the input terminal side of the amplifier and the bypass line and a switch is provided on the output terminal side to solve the above-described problem. That is, the input signal is connected to the variable gain amplifier 12 side that receives power supply from the power supply circuit 15 when amplification is required by the switch 11 and the switch 14, and the signal is amplified and output. The signal is output without being amplified by switching to the bypass line 13 side. When an excessive signal is assumed to be input as an input, an attenuator may be inserted in the middle of the bypass line.

しかし、上記のような構成の可変利得増幅器において、入出力側のスイッチをバイパス線路側に切り替えた場合、増幅器の入出力がオープン状態となり、増幅器が動作しているとその状態によっては発振等の不安定動作を起こす場合がある。   However, in the variable gain amplifier configured as described above, when the input / output side switch is switched to the bypass line side, the input / output of the amplifier is in an open state. May cause unstable operation.

またこの発振により飽和レベルに近い出力が、スイッチのアイソレーション分のレベルは低下するものの出力端子に出力されたり、可変利得増幅器の寿命を短くしたり、破損させたりするという問題があった。
特開２０００−１６５１６４号公報 In addition, there is a problem that the output close to the saturation level due to this oscillation is output to the output terminal although the level of the isolation of the switch is lowered, and the life of the variable gain amplifier is shortened or damaged.
JP 2000-165164 A

本発明は上記のような従来の可変利得増幅器の問題点に鑑みてなされたもので、増幅器の不要な発振などを押さえて安定に動作させることが可能な可変利得増幅器を提供することを目的とする。   The present invention has been made in view of the problems of the conventional variable gain amplifier as described above, and an object of the present invention is to provide a variable gain amplifier capable of stably operating while suppressing unnecessary oscillation of the amplifier. To do.

本発明によれば、高周波信号が入力される１入力２出力スイッチと、２入力１出力スイッチと、前記１入力２出力スイッチの出力端子と前記２入力１出力スイッチの入力端子の間に、並列に接続された増幅器及びバイパス線路と、前記増幅器の電力を供給する電源回路と、この電源回路の前記増幅器への電力の供給をオンオフ制御する電力スイッチからなり、前記１入力２出力スイッチ及び前記２入力１出力スイッチが前記増幅器側に切替えられるときには、前記電力スイッチをオンとし、前記１入力２出力スイッチ及び前記２入力１出力スイッチが前記バイパス線路側に切替えられるときには、前記電力スイッチをオフに制御することを特徴とする可変利得増幅器を提供する。   According to the present invention, a 1-input 2-output switch to which a high-frequency signal is input, a 2-input 1-output switch, and an output terminal of the 1-input 2-output switch and an input terminal of the 2-input 1-output switch are connected in parallel. An amplifier and a bypass line connected to the power supply circuit, a power supply circuit that supplies power to the amplifier, and a power switch that controls on / off of power supply to the amplifier of the power supply circuit. When the input 1 output switch is switched to the amplifier side, the power switch is turned on, and when the 1 input 2 output switch and the 2 input 1 output switch are switched to the bypass line side, the power switch is turned off. A variable gain amplifier is provided.

本発明によれば、出力信号損失の低減と消費電力の抑制、加えてバイパス線路への切り替えに伴う増幅器の発振を防止し、増幅器の短寿命化や破損を防ぐ可変利得増幅器が得られる。   According to the present invention, it is possible to obtain a variable gain amplifier that reduces output signal loss, suppresses power consumption, prevents oscillation of the amplifier accompanying switching to a bypass line, and prevents the amplifier from having a short life or damage.

以下、本発明の実施形態について図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

本発明における一実施形態の回路構成を図１に示す。この実施形態の可変利得増幅器は、入力信号が入力される１つの入力端子と２つの出力端子を有してこれらを切り替えることのできる１入力２出力スイッチ１１と、この１入力２出力スイッチ１１の第１の出力端子にその入力端子を接続された増幅器１２と、上記スイッチ１１の第２の出力端子に一端を接続されたバイパス線路１３と、増幅器１２の出力端子にその第１の入力端子を接続されバイパス線路１３の他端に第２の入力端子を接続されそれぞれ入力としてこれを切り替えて１つの出力端子に出力する２入力１出力スイッチ１４と、増幅器１２に電力を供給する電源回路１５と、この電源回路１５の電力供給をオン／オフする電力スイッチ１６と、１入力２出力スイッチ１１の入力端子に入力される信号の大きさに応じて電力スイッチ１６と上記１入力２出力スイッチ１１、２入力１出力スイッチ１４を同期して制御するスイッチ制御回路１７とから成る。   A circuit configuration of an embodiment of the present invention is shown in FIG. The variable gain amplifier of this embodiment includes a 1-input 2-output switch 11 that has one input terminal to which an input signal is input and two output terminals and can switch between them. The amplifier 12 having its input terminal connected to the first output terminal, the bypass line 13 having one end connected to the second output terminal of the switch 11, and the first input terminal to the output terminal of the amplifier 12 A second input terminal is connected to the other end of the bypass line 13 and is connected to the second input terminal to switch it as an input and output to one output terminal; a power supply circuit 15 for supplying power to the amplifier 12; The power switch 16 for turning on / off the power supply of the power supply circuit 15 and the power switch according to the magnitude of the signal input to the input terminal of the 1-input 2-output switch 11 Of 16 and the one input and two-output switch 11, the 2-input 1-output switch 14 in synchronization with control of the switch control circuit 17.

スイッチ制御回路１７は、１入力２出力スイッチ１１及び２入力１出力スイッチ１４が、各々増幅器１２の入力端子、出力端子に接続されたとき、電力スイッチ１６をオンとして、増幅器１２に電力を供給し、１入力２出力スイッチ１１及び２入力１出力スイッチ１４が、バイパス線路１３に接続されたとき、電力スイッチ１６をオフとして、増幅器１２への電力の供給を遮断するように、これら３つのスイッチを制御する。   The switch control circuit 17 turns on the power switch 16 to supply power to the amplifier 12 when the 1-input 2-output switch 11 and the 2-input 1-output switch 14 are connected to the input terminal and output terminal of the amplifier 12, respectively. When the 1-input 2-output switch 11 and the 2-input 1-output switch 14 are connected to the bypass line 13, the power switch 16 is turned off and the power supply to the amplifier 12 is cut off. Control.

次に、本実施形態の可変利得増幅器の動作について説明する。まず、１入力２出力スイッチ１１の入力端子に入力される信号が所定値よりも小さいとき、即ち入力信号の増幅を必要とする小信号入力の場合、１入力２出力スイッチ１１は入力端子を増幅器１２の入力端子側に接続し、２入力１出力スイッチ１４も増幅器１２の出力端子側に接続し、電力スイッチ１６をオンとし、増幅器１２を動作させる。   Next, the operation of the variable gain amplifier of this embodiment will be described. First, when the signal input to the input terminal of the 1-input 2-output switch 11 is smaller than a predetermined value, that is, in the case of a small signal input that requires amplification of the input signal, the 1-input 2-output switch 11 amplifies the input terminal. 12 is connected to the input terminal side, the 2-input 1-output switch 14 is also connected to the output terminal side of the amplifier 12, the power switch 16 is turned on, and the amplifier 12 is operated.

これにより、１入力２出力スイッチ１１の入力端子に入力される入力信号は、増幅器１２において増幅されて出力される。   As a result, the input signal input to the input terminal of the 1-input 2-output switch 11 is amplified by the amplifier 12 and output.

１入力２出力スイッチの入力端子に入力信号として、所定値よりも大きい信号が１入力２出力スイッチ１１に入力された場合、増幅を必要としない大信号が入力されたときには、１入力２出力スイッチ１１はバイパス線路１３側に接続され、２入力１出力スイッチ１４もバイパス線路１３側に接続される。このとき電力スイッチ１６はオフ状態となって増幅器１２への電力供給を停止する。したがってこの場合には増幅器１２は動作を停止し、発振などの不安定動作を防止することができる。   When a signal larger than a predetermined value is input to the input terminal of the 1-input 2-output switch as an input signal to the 1-input 2-output switch 11, when a large signal that does not require amplification is input, the 1-input 2-output switch 11 is connected to the bypass line 13 side, and the 2-input 1-output switch 14 is also connected to the bypass line 13 side. At this time, the power switch 16 is turned off and the power supply to the amplifier 12 is stopped. Therefore, in this case, the amplifier 12 stops operating, and unstable operation such as oscillation can be prevented.

以上述べたように、この実施形態によれば、入力信号が小信号の場合は、増幅器により信号を増幅し、大信号の場合は増幅器をバイパスすることによって、信号の損失を抑えることができる。更に、信号を、増幅器をバイパスさせるときには、増幅器の電力を断つことによって、増幅器の発振などの不安定動作を防ぎ、また消費電力を低減する効果がある。   As described above, according to this embodiment, signal loss can be suppressed by amplifying a signal with an amplifier when the input signal is a small signal and bypassing the amplifier when the input signal is a large signal. Further, when the signal is bypassed through the amplifier, the power of the amplifier is cut off, thereby preventing unstable operation such as oscillation of the amplifier and reducing power consumption.

上記実施形態の例では、大信号入力時にバイパス線路１３を用いて信号を増幅しないで出力していたが、入力信号を減衰させたい場合はバイパス線路にアッテネータを挿入するようにしてもよい。図３にこのような本発明の他の実施形態の回路構成例を示す。図１と同じ番号は同様な回路を意味する。バイパス線路１３に直列にアッテネータ３１を接続し、信号のレベルを調整する。これにより、一定レベル以上の出力を抑えることによって、当該回路や後段の回路の破壊などを防ぐ効果がある。   In the example of the above embodiment, when a large signal is input, the bypass line 13 is used to output the signal without amplification. However, when the input signal is to be attenuated, an attenuator may be inserted into the bypass line. FIG. 3 shows a circuit configuration example of such another embodiment of the present invention. The same numbers as those in FIG. 1 mean similar circuits. An attenuator 31 is connected in series with the bypass line 13 to adjust the signal level. Thus, by suppressing the output above a certain level, there is an effect of preventing the circuit and subsequent circuits from being destroyed.

上記２つの実施形態の例では、増幅器１２への電源回路１５からの電力供給を電力スイッチ１６により、物理的にオン／オフしていたが、電源供給を実質的（電気的）に供給／遮断を何らかの手段により行うようにしてもよい。これにより、電力供給のオン／オフ時の可変利得増幅器１２への負担とそれに伴う不安定動作を低減、抑制することが可能となる。   In the example of the above two embodiments, the power supply from the power supply circuit 15 to the amplifier 12 is physically turned on / off by the power switch 16, but the power supply is substantially (electrically) supplied / cut off. May be performed by some means. As a result, it is possible to reduce or suppress the burden on the variable gain amplifier 12 and the accompanying unstable operation when the power supply is turned on / off.

本発明における一実施形態による可変利得増幅器の回路構成例を示す図。The figure which shows the circuit structural example of the variable gain amplifier by one Embodiment in this invention. 従来の可変利得増幅器の回路構成例を示す図。The figure which shows the circuit structural example of the conventional variable gain amplifier. 本発明における他の実施形態による可変利得増幅器の回路構成例を示す図。The figure which shows the circuit structural example of the variable gain amplifier by other embodiment in this invention.

符号の説明Explanation of symbols

１１・・・１入力２出力スイッチ、
１２・・・増幅器、
１３・・・バイパス線路
１４・・・２入力１出力スイッチ、
１５・・・電源回路、
１６・・・電力スイッチ、
３１・・・アッテネータ。 11 ... 1 input 2 output switch,
12 ... Amplifier,
13 ... Bypass line 14 ... 2 input 1 output switch,
15 ... power supply circuit,
16: Power switch,
31: Attenuator.

Claims (2)

高周波信号が入力される１入力２出力スイッチと、２入力１出力スイッチと、前記１入力２出力スイッチの出力端子と前記２入力１出力スイッチの入力端子の間に、並列に接続された増幅器及びバイパス線路と、前記増幅器の電力を供給する電源回路と、この電源回路の前記増幅器への電力の供給をオンオフ制御する電力スイッチからなり、
前記１入力２出力スイッチ及び前記２入力１出力スイッチが前記増幅器側に切替えられるときには、前記電力スイッチをオンとし、前記１入力２出力スイッチ及び前記２入力１出力スイッチが前記バイパス線路側に切替えられるときには、前記電力スイッチをオフに制御することを特徴とする可変利得増幅器。 A 1-input 2-output switch to which a high-frequency signal is input; a 2-input 1-output switch; an amplifier connected in parallel between the output terminal of the 1-input 2-output switch and the input terminal of the 2-input 1-output switch; A bypass line, a power supply circuit that supplies power of the amplifier, and a power switch that controls on / off of power supply to the amplifier of the power supply circuit,
When the 1-input 2-output switch and the 2-input 1-output switch are switched to the amplifier side, the power switch is turned on, and the 1-input 2-output switch and the 2-input 1-output switch are switched to the bypass line side. In some cases, the variable gain amplifier controls the power switch to be off. 前記バイパス線路に、アッテネータを挿入してなることを特徴とする請求項１記載の可変利得増幅器。 2. The variable gain amplifier according to claim 1, wherein an attenuator is inserted into the bypass line.
JP2005263799A 2005-09-12 2005-09-12 Variable gain amplifier Pending JP2007081535A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021118447A (en) * 2020-01-27 2021-08-10 アンリツ株式会社 Signal generation device and signal generation method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10173453A (en) * 1996-12-09 1998-06-26 Sony Corp High-frequency variable gain amplifying device and radio communication equipment
JP2002124842A (en) * 2000-10-13 2002-04-26 Matsushita Electric Ind Co Ltd Variable gain amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10173453A (en) * 1996-12-09 1998-06-26 Sony Corp High-frequency variable gain amplifying device and radio communication equipment
JP2002124842A (en) * 2000-10-13 2002-04-26 Matsushita Electric Ind Co Ltd Variable gain amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021118447A (en) * 2020-01-27 2021-08-10 アンリツ株式会社 Signal generation device and signal generation method
JP7174726B2 (en) 2020-01-27 2022-11-17 アンリツ株式会社 Signal generator and signal generation method

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