JPH07154254A - Switching circuit for high speed synthesizer - Google Patents

Switching circuit for high speed synthesizer

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Publication number
JPH07154254A
JPH07154254A JP5321213A JP32121393A JPH07154254A JP H07154254 A JPH07154254 A JP H07154254A JP 5321213 A JP5321213 A JP 5321213A JP 32121393 A JP32121393 A JP 32121393A JP H07154254 A JPH07154254 A JP H07154254A
Authority
JP
Japan
Prior art keywords
output
impedance
switch
amplifier
pll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5321213A
Other languages
Japanese (ja)
Other versions
JP3143841B2 (en
Inventor
Takeshi Tsuruzoe
猛 水流添
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
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Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP05321213A priority Critical patent/JP3143841B2/en
Publication of JPH07154254A publication Critical patent/JPH07154254A/en
Application granted granted Critical
Publication of JP3143841B2 publication Critical patent/JP3143841B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To provide the switching circuit for a high speed synthesizer in which changeover is implemented quickly. CONSTITUTION:An output terminal of a PLL synthesizer 1(3) is provided with a high frequency switch 6(8) switched by a control signal and an input terminal of an amplifier 2(4) is provided with a high frequency electronic switch 7(9) switched by a control signal, a high frequency electronic switch 14 selecting a power supply to either of the plural amplifiers 2, 4 are provided, and when an output signal of the PLL synthesizers 1, 3 are not outputted externally, the high frequency electronic switches 6, 8 disconnect the amplifiers 2, 4 and connect to termination impedance sets 10, 12 whose impedance is equal to an output impedance, and the high frequency electronic switches 7, 9 connect the input terminals of the amplifiers 2, 4 to terminal impedance sets 11, 13 whose impedance is equal to the input impedance, and when an output signal of the PLL syntheiszers 1, 3 is outputted externally, no load fluctuation is caused and the output signal is stably switched at a high speed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、複数個のPLLシンセ
サイザを切り替て、一つの高速シンセサイザとして動作
させる回路に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for switching a plurality of PLL synthesizers to operate as one high speed synthesizer.

【0002】[0002]

【従来技術】PLLシンセサイザで入力周波数を変えて
所定の周波数の出力信号を得ることは可能であるが、こ
の方法では出力信号が安定するまでに時間(ロック時
間)がかかる。従って、周波数の異なる所定の出力信号
を即座に取り出すために複数台のPLLシンセサイザの
出力信号を各々所定の周波数に固定しておき、必要な出
力信号を切替て外部へ出力することにより一台の高速シ
ンセサイザとして動作させる方法がとられている。
2. Description of the Related Art It is possible to obtain an output signal of a predetermined frequency by changing an input frequency with a PLL synthesizer, but in this method, it takes time (lock time) until the output signal becomes stable. Therefore, in order to immediately take out predetermined output signals having different frequencies, the output signals of a plurality of PLL synthesizers are fixed at respective predetermined frequencies, and the necessary output signals are switched and output to the outside. A method of operating as a high speed synthesizer is adopted.

【0003】図3は従来の高速シンセサイザのスイッチ
回路の構成例を示す図である。PLLシンセサイザ1と
PLLシンセサイザ3は互いに独立して動作し、それぞ
れ所定の周波数にロックされて出力信号を出力してい
る。高周波電子スイッチ5はPLLシンセサイザ1の出
力信号とPLLシンセサイザ3の出力信号を切替て外部
へ出力するための切替スイッチである。同図に示すよう
に、複数台(図では2台)のPLLシンセサイザの出力
周波数をそれぞれロックし、高周波電子スイッチ5で切
替て所定の周波数の出力信号を外部へ出力する。
FIG. 3 is a diagram showing a configuration example of a switch circuit of a conventional high speed synthesizer. The PLL synthesizer 1 and the PLL synthesizer 3 operate independently of each other and are locked to a predetermined frequency to output an output signal. The high frequency electronic switch 5 is a switch for switching the output signal of the PLL synthesizer 1 and the output signal of the PLL synthesizer 3 and outputting the output signal to the outside. As shown in the figure, the output frequencies of a plurality of PLL synthesizers (two in the figure) are locked, and the high frequency electronic switch 5 switches the output frequencies to output an output signal of a predetermined frequency to the outside.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、従来の
方法ではPLLシンセサイザ1、3の出力信号は切替ス
イッチ5により切替られるので、外部へ出力していると
きと、出力していないときではPLLシンセサイザ1、
3の負荷変動が激しく、切替時にロックしていた周波数
がずれ出力信号が不安定になり、安定するまでに時間が
かかると云う問題があった。
However, in the conventional method, the output signals of the PLL synthesizers 1 and 3 are switched by the changeover switch 5, so that the PLL synthesizer 1 is output when it is output to the outside and when it is not output. ,
There is a problem that the load fluctuation of No. 3 is severe, the frequency locked at the time of switching is deviated, the output signal becomes unstable, and it takes time to stabilize.

【0005】本発明は上述の点に鑑みてなされたもの
で、上記問題点を除去し、切替が速やかに行われる高速
シンセサイザのスイッチ回路を提供することを目的とす
る。
The present invention has been made in view of the above points, and an object of the present invention is to eliminate the above-mentioned problems and provide a switch circuit of a high-speed synthesizer in which switching is performed quickly.

【0006】[0006]

【課題を解決するための手段】上記課題を解決するため
本発明は、複数台(図1では2台)のPLLシンセサイ
ザとアンプと操作信号で動作する高周波電子スイッチを
具備し、各PLLシンセサイザの出力信号をアンプで増
幅し、一つの信号を高周波電子スイッチで切替て外部へ
出力する高速シンセサイザのスイッチ回路において、図
1に示すように、各PLLシンセサイザ(1,3)の出
力端子に操作信号で切替動作する第1の高周波電子スイ
ッチ(6,8)と、アンプの入力端子に操作信号で切替
動作する第2の高周波電子スイッチ(7,9)を設け、
複数台のアンプ(2,4)の内1台に電源を切替て供給
する電源高周波電子スイッチ(14)とを設け、PLL
シンセサイザ(1)又は(3)の出力信号を外部へ出力
しない時は、第1の高周波電子スイッチ(6)又は
(8)は該PLLシンセサイザ(1)又は(3)の出力
端子を該PLLシンセサイザ(1)又は(3)の出力イ
ンピ−ダンスと同じ値の終端インピ−ダンス(10)又
は(12)に切替え接続すると共に、第2の高周波電子
スイッチ(7)又は(9)はアンプ(2)又は(4)の
入力端子を該アンプ(2)又は(4)の入力インピ−ダ
ンスと同じ値の終端インピ−ダンス(11)または(1
3)に切替て接続し、PLLシンセサイザ(3)又は
(1)の出力信号を外部へ出力する時は、該出力信号は
第1及び第2の高周波電子スイッチ(8,9又は6,
7)の接点を通り、電源高周波電子スイッチ(14)で
電源が供給されたアンプ(4)又は(2)で増幅し、高
周波電子スイッチ(5)を介して外部へ出力することを
特徴とする。
In order to solve the above-mentioned problems, the present invention comprises a plurality of (two in FIG. 1) PLL synthesizers, an amplifier and a high-frequency electronic switch that operates by an operation signal. In a switching circuit of a high-speed synthesizer that amplifies an output signal with an amplifier and outputs one signal by switching with a high-frequency electronic switch, as shown in FIG. 1, an operation signal is output to an output terminal of each PLL synthesizer (1, 3). The first high-frequency electronic switch (6, 8) that is switched by the above, and the second high-frequency electronic switch (7, 9) that is switched by the operation signal are provided at the input terminals of the amplifier.
A power supply high-frequency electronic switch (14) for switching and supplying power to one of a plurality of amplifiers (2, 4)
When the output signal of the synthesizer (1) or (3) is not output to the outside, the first high-frequency electronic switch (6) or (8) outputs the output terminal of the PLL synthesizer (1) or (3) to the PLL synthesizer. The terminal impedance (10) or (12) having the same value as the output impedance of (1) or (3) is switched and connected, and the second high frequency electronic switch (7) or (9) is connected to the amplifier (2). ) Or (4) input terminal to the terminal impedance (11) or (1) of the same value as the input impedance of the amplifier (2) or (4).
When the output signal of the PLL synthesizer (3) or (1) is output to the outside by switching and connecting to 3), the output signal is the first and second high frequency electronic switches (8, 9 or 6,).
The amplifier (4) or (2), which is supplied with power by the power supply high frequency electronic switch (14), passes through the contact of 7), and is amplified to the outside through the high frequency electronic switch (5) .

【0007】[0007]

【作用】PLLシンセサイザは負荷が急に変動するとロ
ックしていた周波数がずれ、安定化するまでに時間がか
かる。本発明では上記のように、PLLシンセサイザ
(1)又は(3)の出力信号を外部へ出力しない時は、
第1の高周波電子スイッチ(6)又は(8)は該PLL
シンセサイザ(1)又は(3)の出力端子を該PLLシ
ンセサイザ(1)又は(3)の出力インピ−ダンスと同
じ値の終端インピ−ダンス(10)又は(12)に切替
え接続すると共に、第2の高周波電子スイッチ(7)又
は(9)はアンプ(2)又は(4)の入力端子を該アン
プ(2)又は(4)の入力インピ−ダンスと同じ値の終
端インピ−ダンス(11)又は(13)に切替て接続
し、PLLシンセサイザ(3)又は(1)の出力信号を
外部へ出力する時は、該出力信号は第1及び第2の高周
波電子スイッチ(8,9又は6,7)の接点を通り、電
源高周波電子スイッチ(14)で電源が供給されたアン
プ(4)又は(2)で増幅し、高周波電子スイッチ
(5)を介して外部へ出力するので、切替時の該PLL
シンセサイザ(1,3)の負荷変動を防止する。
In the PLL synthesizer, when the load changes abruptly, the locked frequency shifts and it takes time to stabilize. In the present invention, as described above, when the output signal of the PLL synthesizer (1) or (3) is not output to the outside,
The first high frequency electronic switch (6) or (8) is the PLL
The output terminal of the synthesizer (1) or (3) is switch-connected to the terminal impedance (10) or (12) having the same value as the output impedance of the PLL synthesizer (1) or (3), and the second terminal Of the high-frequency electronic switch (7) or (9) of the amplifier (2) or (4) has the same value as the input impedance of the amplifier (2) or (4). When the output signal of the PLL synthesizer (3) or (1) is output to the outside by switching and connecting to (13), the output signal is the first and second high frequency electronic switches (8, 9 or 6, 7). ), Is amplified by the amplifier (4) or (2) to which power is supplied by the power supply high frequency electronic switch (14) and is output to the outside through the high frequency electronic switch (5). PLL
The load fluctuation of the synthesizer (1, 3) is prevented.

【0008】図2は切替のタイミングチャ−トである。
図3に示す従来方法の切替回路では切替信号swで高周
波電子スイッチ5を切替た場合、出力信号PはPLLシ
ンセサイザ1の出力AからPLLシンセサイザ3の出力
Bへ切り替わるが安定するまでに約400μsの時間が
かかる。図1に示す本発明の切替回路では不安定な時間
は殆どなく切替ることが出来る。なお、インピ−ダンス
の切替信号SW2とアンプ電源及び、アンプ出力切替信
号SW1の時間差はアンプの電源投入から動作までの時
間である(詳細後述)。
FIG. 2 shows a switching timing chart.
In the switching circuit of the conventional method shown in FIG. 3, when the high-frequency electronic switch 5 is switched by the switching signal sw, the output signal P switches from the output A of the PLL synthesizer 1 to the output B of the PLL synthesizer 3, but it takes about 400 μs until it stabilizes. take time. The switching circuit of the present invention shown in FIG. 1 can perform switching with almost no unstable time. The time difference between the impedance switching signal SW2, the amplifier power supply, and the amplifier output switching signal SW1 is the time from power-on to operation of the amplifier (details will be described later).

【0009】[0009]

【実施例】以下本発明の一実施例を図面に基づいて詳細
に説明する。図1は本発明の高速シンセサイザのスイッ
チ回路の構成例を示す図である。図示するように本発明
の高速シンセサイザのスイッチ回路はPLLシンセサイ
ザ1とPLLシンセサイザ3の2台のシンセサイザの出
力を切替て出力する為のスイッチ回路であり、高周波電
子スイッチ5、6、7、8、9、アンプ2、4、インピ
−ダンス10、11、12、13、FET電源スイッチ
14から構成される。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a switch circuit of a high speed synthesizer of the present invention. As shown in the figure, the switch circuit of the high speed synthesizer of the present invention is a switch circuit for switching and outputting the outputs of the two synthesizers of the PLL synthesizer 1 and the PLL synthesizer 3, and the high frequency electronic switches 5, 6, 7, 8, 9, an amplifier 2, 4, an impedance 10, 11, 12, 13, and a FET power switch 14.

【0010】PLLシンセサイザ1の出力は高周波電子
スイッチ6、7、アンプ2を通り高周波電子スイッチ5
で切替られて外部に出力される。PLLシンセサイザ3
の出力は高周波電子スイッチ8、9、アンプ4を通り高
周波電子スイッチ5で切替られて外部に出力される。P
LLシンセサイザ1の出力信号が外部に出力されない時
には、インピ−ダンス10は高周波電子スイッチ6を介
してPLLシンセサイザ1の終端インピ−ダンスとして
接続される。同様に、PLLシンセサイザ3の出力信号
が外部に出力されない時には、インピ−ダンス12は高
周波電子スイッチ8を介してPLLシンセサイザ3の終
端インピ−ダンスとして接続される。インピ−ダンス1
0、11の値はPLLシンセサイザ1、3の出力インピ
−ダンスと同じ値とする。本回路では50オ−ムの抵抗
とコンデンサを直列に接続した。
The output of the PLL synthesizer 1 passes through the high frequency electronic switches 6 and 7 and the amplifier 2 and the high frequency electronic switch 5
It is switched by and output to the outside. PLL synthesizer 3
The output of is passed through the high frequency electronic switches 8 and 9 and the amplifier 4 and is switched by the high frequency electronic switch 5 to be output to the outside. P
When the output signal of the LL synthesizer 1 is not output to the outside, the impedance 10 is connected via the high-frequency electronic switch 6 as the terminal impedance of the PLL synthesizer 1. Similarly, when the output signal of the PLL synthesizer 3 is not output to the outside, the impedance 12 is connected as a terminal impedance of the PLL synthesizer 3 via the high frequency electronic switch 8. Impedance 1
The values of 0 and 11 are the same as the output impedance of the PLL synthesizers 1 and 3. In this circuit, a 50 ohm resistor and a capacitor were connected in series.

【0011】アンプ2が使用されていないときには、イ
ンピ−ダンス11は高周波電子スイッチ7を介してアン
プ2の入力端子に接続される。同様に、アンプ4が使用
されていないときには、インピ−ダンス13は高周波電
子スイッチ9を介してアンプ4の入力端子に接続され
る。インピ−ダンス11、13はアンプ2、4の入力イ
ンピ−ダンスと同じ値とする。本回路では50オ−ムの
抵抗とコンデンサを直列に接続した。
When the amplifier 2 is not used, the impedance 11 is connected to the input terminal of the amplifier 2 via the high frequency electronic switch 7. Similarly, the impedance 13 is connected to the input terminal of the amplifier 4 via the high frequency electronic switch 9 when the amplifier 4 is not used. The impedances 11 and 13 have the same values as the input impedances of the amplifiers 2 and 4. In this circuit, a 50 ohm resistor and a capacitor were connected in series.

【0012】図1において、PLLシンセサイザ1とP
LLシンセサイザ3は互いに独立に動作し、それぞれ所
定の周波数に固定されている。PLLシンセサイザ1の
出力信号は高周波電子スイッチ6、7を通り、アンプ2
で増幅され高周波電子スイッチ5の入力端子5−1に入
力される。PLLシンセサイザ3の出力信号は高周波電
子スイッチ8、9を通りアンプ4で増幅され高周波電子
スイッチ5の入力端子5−2に入力される。前記各高周
波電子スイッチ5、6、7、8、9は切替信号SW2、
FET電源スイッチ14は切替信号SW1により切替ら
れ、PLLシンセサイザ1又は、PLLシンセサイザ3
のどちらか一方の信号を出力するように動作する。
In FIG. 1, the PLL synthesizer 1 and P
The LL synthesizers 3 operate independently of each other and are fixed at predetermined frequencies. The output signal of the PLL synthesizer 1 passes through the high-frequency electronic switches 6 and 7 and the amplifier 2
And is input to the input terminal 5-1 of the high frequency electronic switch 5. The output signal of the PLL synthesizer 3 passes through the high frequency electronic switches 8 and 9, is amplified by the amplifier 4, and is input to the input terminal 5-2 of the high frequency electronic switch 5. The high-frequency electronic switches 5, 6, 7, 8 and 9 have switching signals SW2,
The FET power switch 14 is switched by the switching signal SW1, and the PLL synthesizer 1 or the PLL synthesizer 3 is switched.
It operates so as to output either one of the signals.

【0013】図1に示すようにPLLシンセサイザ1を
出力している状態から、切替信号SW1及び、切替信号
SW2により各高周波電子スイッチ5、6、7、8、9
を切替ると、PLLシンセサイザ1の出力信号は高周波
電子スイッチ6の入力端子6−1から出力端子6−3に
切替られインピ−ダンス10へ出力される。高周波電子
スイッチ7の出力端子7−3は入力端子7−2に切替ら
れアンプ2の入力端子にインピ−ダンス11が接続され
る。
From the state in which the PLL synthesizer 1 is being output as shown in FIG.
, The output signal of the PLL synthesizer 1 is switched from the input terminal 6-1 to the output terminal 6-3 of the high frequency electronic switch 6 and is output to the impedance 10. The output terminal 7-3 of the high frequency electronic switch 7 is switched to the input terminal 7-2, and the impedance 11 is connected to the input terminal of the amplifier 2.

【0014】図2は切替のタイミングチャ−トである。
PLLシンセサイザ1から出力信号P1を出力している
状態Aから切替信号SW1でアンプ2の電源をアンプ4
に切替ると共に高周波電子スイッチ5をアンプ4の出力
に切替る。アンプ4が動作する時間だけ遅れて切替信号
SW2で高周波電子スイッチ6、7、8、9を動作させ
インピ−ダンスを切替る。PLLシンセサイザ3の出力
信号は高周波電子スイッチ8の入力端子8−1から出力
端子8−3に出力され高周波電子スイッチ9の入力端子
9−2から出力端子9−3を通りアンプ4で増幅され、
高周波電子スイッチ5の入力端子5−2から出力端子5
−3を通って外部へ出力される。アンプ4は既に動作を
開始しているので入力インピ−ダンスはインピ−ダンス
13と同値で変動はない。PLLシンセサイザ3の出力
インピ−ダンスはインピ−ダンス12の値と同値で負荷
変動はない。従って、PLLシンセサイザ2でロックさ
れていた周波数が変化することなく、高周波電子スイッ
チ8、9の動作と同時に安定した状態Bの出力信号P1
を出力することが出来る。
FIG. 2 shows a switching timing chart.
From the state A in which the output signal P1 is being output from the PLL synthesizer 1, the power of the amplifier 2 is switched to the amplifier 4 by the switching signal SW1.
And the high frequency electronic switch 5 is switched to the output of the amplifier 4. The high-frequency electronic switches 6, 7, 8 and 9 are operated by the switching signal SW2 after a delay of the operation time of the amplifier 4 to switch the impedance. The output signal of the PLL synthesizer 3 is output from the input terminal 8-1 of the high frequency electronic switch 8 to the output terminal 8-3, passes through the input terminal 9-2 of the high frequency electronic switch 9 and the output terminal 9-3, and is amplified by the amplifier 4.
The input terminal 5-2 to the output terminal 5 of the high-frequency electronic switch 5
It is output to the outside through -3. Since the amplifier 4 has already started operation, the input impedance is the same value as the impedance 13 and does not change. The output impedance of the PLL synthesizer 3 is the same as the value of the impedance 12, and there is no load fluctuation. Therefore, the frequency locked by the PLL synthesizer 2 does not change, and the output signal P1 in the stable state B at the same time as the operation of the high frequency electronic switches 8 and 9 is performed.
Can be output.

【0015】一方、インピ−ダンス10の値はPLLシ
ンセサイザ1の出力インピ−ダンスと同値でありPLL
シンセサイザ1の負荷変動はない。また、インピ−ダン
ス11の値はアンプ2の動作時の入力インピ−ダンスと
同値であり変動はない。
On the other hand, the value of the impedance 10 is the same value as the output impedance of the PLL synthesizer 1, and the PLL
There is no load fluctuation of the synthesizer 1. Further, the value of the impedance 11 is the same as the input impedance when the amplifier 2 is operating and does not change.

【0016】[0016]

【発明の効果】以上、詳細に説明したように本発明によ
れば、下記のような優れた効果が期待される。従来方法
の切替回路では切替信号で高周波電子スイッチを切替た
場合、出力信号がPLLシンセサイザの出力からPLL
シンセサイザの出力へ切り替わり安定するまでに約40
0μsの時間がかかるが、本発明の切替回路では不安定
な時間は殆どなく切替ることが出来る。従って、PLL
シンセサイザ内のアイソレ−ションを高くするためのバ
ッファ回路や抵抗パッド等が少なくてすみ、回路の簡素
化及び電流低減をすることが出来る。
As described in detail above, according to the present invention, the following excellent effects are expected. In the conventional switching circuit, when the high-frequency electronic switch is switched by the switching signal, the output signal changes from the output of the PLL synthesizer to the PLL.
It takes about 40 to switch to the output of the synthesizer and stabilize.
Although it takes a time of 0 μs, the switching circuit of the present invention can perform switching with almost no unstable time. Therefore, the PLL
A buffer circuit for increasing isolation in the synthesizer, a resistance pad, and the like can be reduced, and the circuit can be simplified and the current can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の高速シンセサイザのスイッチ回路の構
成例を示す図である。
FIG. 1 is a diagram showing a configuration example of a switch circuit of a high speed synthesizer of the present invention.

【図2】切替のタイミングチャ−トである。FIG. 2 is a switching timing chart.

【図3】従来の高速シンセサイザのスイッチ回路の構成
例を示す図である。
FIG. 3 is a diagram showing a configuration example of a switch circuit of a conventional high-speed synthesizer.

【符号の説明】 1 PLLシンセサイザ 2 アンプ 3 PLLシンセサイザ 4 アンプ 5 高周波電子スイッチ 6 高周波電子スイッチ 7 高周波電子スイッチ 8 高周波電子スイッチ 9 高周波電子スイッチ 10 インピ−ダンス 11 インピ−ダンス 12 インピ−ダンス 13 インピ−ダンス 14 FET電源スイッチ[Explanation of reference symbols] 1 PLL synthesizer 2 Amplifier 3 PLL synthesizer 4 Amplifier 5 High frequency electronic switch 6 High frequency electronic switch 7 High frequency electronic switch 8 High frequency electronic switch 9 High frequency electronic switch 10 Impedance 11 Impedance 12 Impedance 13 Impedance Dance 14 FET power switch

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 複数台のPLLシンセサイザとアンプと
操作信号で動作する出力切替スイッチを具備し、前記各
PLLシンセサイザの出力信号を前記アンプで増幅し、
一つの信号を前記出力切替スイッチで切替て外部へ出力
する高速シンセサイザのスイッチ回路において、 前記各PLLシンセサイザの出力端子に操作信号で切替
動作する第1の切替スイッチと、アンプの入力端子に操
作信号で切替動作する第2の切替スイッチを設け、前記
複数台のアンプの内1台に電源を切替て供給する電源切
替スイッチとを設け、 PLLシンセサイザの出力信号を外部へ出力しない時
は、第1の切替スイッチは該PLLシンセサイザの出力
端子を該PLLシンセサイザの出力インピ−ダンスと同
じ値の終端インピ−ダンスに切替え接続すると共に、第
2の切替スイッチはアンプの入力端子を該アンプの入力
インピ−ダンスと同じ値の終端インピ−ダンスに切替て
接続し、 PLLシンセサイザの出力信号を外部へ出力する時は、
該出力信号は第1及び第2の切替スイッチの接点を通
り、前記電源切替スイッチで電源が供給されたアンプで
増幅し、前記出力切替スイッチを介して外部へ出力する
ことを特徴とする高速シンセサイザのスイッチ回路。
1. A plurality of PLL synthesizers, an amplifier, and an output changeover switch that operates by an operation signal are provided, and the output signal of each of the PLL synthesizers is amplified by the amplifier,
In a switch circuit of a high-speed synthesizer that switches one signal with the output changeover switch and outputs it to the outside, a first changeover switch that performs a changeover operation with an operation signal at an output terminal of each PLL synthesizer and an operation signal at an input terminal of an amplifier Is provided with a second change-over switch for switching the power supply to one of the plurality of amplifiers and a power supply change-over switch for supplying power by switching the power supply. When the output signal of the PLL synthesizer is not output to the outside, Change switch connects the output terminal of the PLL synthesizer to a terminal impedance having the same value as the output impedance of the PLL synthesizer, and the second change switch switches the input terminal of the amplifier to the input impedance of the amplifier. Switch to the terminal impedance of the same value as the dance and connect it, and output the output signal of the PLL synthesizer to the outside. It is,
The output signal passes through the contacts of the first and second changeover switches, is amplified by an amplifier supplied with power by the power changeover switch, and is output to the outside through the output changeover switch. Switch circuit.
JP05321213A 1993-11-25 1993-11-25 Switch circuit of high-speed synthesizer Expired - Fee Related JP3143841B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP05321213A JP3143841B2 (en) 1993-11-25 1993-11-25 Switch circuit of high-speed synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP05321213A JP3143841B2 (en) 1993-11-25 1993-11-25 Switch circuit of high-speed synthesizer

Publications (2)

Publication Number Publication Date
JPH07154254A true JPH07154254A (en) 1995-06-16
JP3143841B2 JP3143841B2 (en) 2001-03-07

Family

ID=18130072

Family Applications (1)

Application Number Title Priority Date Filing Date
JP05321213A Expired - Fee Related JP3143841B2 (en) 1993-11-25 1993-11-25 Switch circuit of high-speed synthesizer

Country Status (1)

Country Link
JP (1) JP3143841B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011244279A (en) * 2010-05-19 2011-12-01 Advantest Corp Pll frequency synthesizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011244279A (en) * 2010-05-19 2011-12-01 Advantest Corp Pll frequency synthesizer

Also Published As

Publication number Publication date
JP3143841B2 (en) 2001-03-07

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