JPH0142163B2 - - Google Patents
Info
- Publication number
- JPH0142163B2 JPH0142163B2 JP58114000A JP11400083A JPH0142163B2 JP H0142163 B2 JPH0142163 B2 JP H0142163B2 JP 58114000 A JP58114000 A JP 58114000A JP 11400083 A JP11400083 A JP 11400083A JP H0142163 B2 JPH0142163 B2 JP H0142163B2
- Authority
- JP
- Japan
- Prior art keywords
- alc
- circuit
- time constant
- voltage
- variable gain
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Transmitters (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はALC回路に係わり、特に移動無線等
アンテナのSWRが変化する送信回路に適用する
ALC回路に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ALC circuit, and is particularly applicable to a transmitting circuit in which the SWR of an antenna such as a mobile radio changes.
Regarding ALC circuit.
通常、第１図に示す送信終段３をALCループ
に組込むには送信終段部３の前段に設けられた可
変利得増幅器２等の各段の回路の利得を自動調整
する。調整に必要な情報は送信終段部３またはオ
ーバドライブ検出器４で生成される。生成された
情報はALC電圧と称し、オーバドライブ検出器
４から得られるALC電圧は、送信終段部３から
オーバドライブ検出器４へ送出される前進電力か
ら生成する。オーバドライブ検出器４へ前進電力
が入力されると、この前進電力の一部は整流され
前進電圧となつて比較器５に送られる。比較器５
には基準電圧V1が設けてあり、前進電圧が基準
電圧V1以上となるとALC電圧を出力する。可変
利得増幅器２等の各段の回路は端子２ａにALC
電圧を受けると、入力信号レベルに対する出力信
号レベルの動作特性が変化する。ALC回路は一
種の帰還ループ回路であるから取扱う信号に応じ
た応答特性が得られるよう時定数回路７が設けて
ある。この時定数回路７でALC電圧を保持する
時間をALC保持時間という。ALC保持時間は出
力信号の包絡線の周期、歪等を考慮して決定す
る。移動無線等でアンテナ６の状態が変化し
SWRが急激に変化するとアンテナ不整合により
送信終段が劣化、損傷を受けることがある。この
場合に対処するため第１図に示す如く、オーバド
ライブ検出器４とアンテナ６との間の鎖線の結線
を切断し、X1，X2，X3の結線を接続してアンテ
ナ不整合検出器１０を設ける。アンテナ不整合検
出器１０は反射電力の一部を整流して反射電圧を
得、この反射電圧と基準電圧V2とを比較器１１
で比較する。比較に応じて信号を生成し、時定数
回路７の端子７ａへこの信号すなわちALC電圧
を出力する。なお、電源回路、送信回路各部の発
熱は送信終段部３の異常動作に起因する場合が多
いので発熱による各部回路の損傷を防止するには
温度センサ等に接続したブザー等の警報手段を用
いるよりは送信終段部３の異常動作を抑圧したほ
うがよい。このため、各部に設けた温度センサ等
に係わる信号すなわちALC電圧を可変利得増幅
器２の端子２ａまたは時定数回路７の端子７ａへ
送出するようなされたものである。
Normally, in order to incorporate the transmission final stage 3 shown in FIG. 1 into an ALC loop, the gain of each stage circuit such as the variable gain amplifier 2 provided before the transmission final stage 3 is automatically adjusted. Information necessary for adjustment is generated by the transmission final stage section 3 or the overdrive detector 4. The generated information is called an ALC voltage, and the ALC voltage obtained from the overdrive detector 4 is generated from the forward power sent from the transmission final stage 3 to the overdrive detector 4. When forward power is input to the overdrive detector 4, a portion of this forward power is rectified and turned into a forward voltage and sent to the comparator 5. Comparator 5
is provided with a reference voltage V1 , and outputs an ALC voltage when the forward voltage exceeds the reference voltage V1 . The circuits of each stage such as variable gain amplifier 2 are connected to ALC at terminal 2a.
When a voltage is applied, the operating characteristics of the output signal level relative to the input signal level change. Since the ALC circuit is a type of feedback loop circuit, a time constant circuit 7 is provided to obtain response characteristics according to the signals handled. The time during which the ALC voltage is held by the time constant circuit 7 is called the ALC holding time. The ALC holding time is determined by taking into consideration the period of the output signal envelope, distortion, etc. When the state of antenna 6 changes in mobile radio etc.
If the SWR changes rapidly, the final transmission stage may be degraded or damaged due to antenna mismatch. To deal with this case, as shown in Figure 1, the chain line connection between the overdrive detector 4 and the antenna 6 is cut, and the connections X 1 , X 2 , and X 3 are connected to detect antenna mismatch. A container 10 is provided. Antenna mismatch detector 10 rectifies a part of the reflected power to obtain a reflected voltage, and compares this reflected voltage with reference voltage V 2 by comparator 11
Compare with. A signal is generated according to the comparison, and this signal, that is, the ALC voltage is output to the terminal 7a of the time constant circuit 7. Note that heat generation in each part of the power supply circuit and transmission circuit is often caused by abnormal operation of the transmission final stage 3, so to prevent damage to each part circuit due to heat generation, use alarm means such as a buzzer connected to a temperature sensor, etc. It is better to suppress the abnormal operation of the transmission final stage section 3. For this reason, signals related to temperature sensors and the like provided in various parts, that is, ALC voltages, are sent to the terminal 2a of the variable gain amplifier 2 or the terminal 7a of the time constant circuit 7.
従来のALC回路を移動無線等の送信回路に設
けると移動によりアンテナ６のSWRが急激に悪
化したときアンテナ不整合検出器１０から時定数
回路７の端子７ａへ信号が送出される。この信号
は時定数回路７の時定数で定まる保持時間の間保
持されるのでSWRが正常に復帰した時以降でも
可変利得増幅器２は引続きALC電圧による制御
を受ける。このため、出力電圧は保持時間が経過
するまで低減されたままとなる現象が発生し、本
来のALC回路の機能をそこなう欠点を有してい
る。
When a conventional ALC circuit is provided in a transmitting circuit of a mobile radio or the like, a signal is sent from the antenna mismatch detector 10 to the terminal 7a of the time constant circuit 7 when the SWR of the antenna 6 suddenly deteriorates due to movement. Since this signal is held for a holding time determined by the time constant of the time constant circuit 7, the variable gain amplifier 2 continues to be controlled by the ALC voltage even after the SWR returns to normal. Therefore, a phenomenon occurs in which the output voltage remains reduced until the holding time elapses, which has the disadvantage of impairing the original function of the ALC circuit.
本発明は上述した従来の欠点を解消し、移動無
線等送信状態が急変する送信回路に適用した際、
適切な応答特性が得られるALC回路を提供する
ことを目的とする。 The present invention solves the above-mentioned conventional drawbacks, and when applied to a transmission circuit such as a mobile radio where transmission conditions suddenly change,
The purpose is to provide an ALC circuit that can obtain appropriate response characteristics.
本発明は個々の原因に対応してALC電圧検出
手段を設け、更に、それぞれのALC電圧を各別
に保持する複数の時定数回路を設けた構成となつ
ている。ALC電圧は第１の時定数回路、第２の
時定数回路、…によりそれぞれ独立した保持時間
で保持される構成である。
The present invention has a configuration in which ALC voltage detection means are provided corresponding to individual causes, and a plurality of time constant circuits are further provided to hold each ALC voltage separately. The ALC voltage is held at independent holding times by a first time constant circuit, a second time constant circuit, and so on.
第２図は本発明のALC回路の一実施例を示す
ブロツク図であり、第２図について説明する。図
中２は可変利得増幅器、３は送信終段部、第１の
ALC電圧検出手段はオーバドライブ検出器４と、
比較器５で構成され、その出力側は第１の時定数
回路７のコンデンサ８と抵抗９に接続し、該コン
デンサ８と抵抗９の他端は接地する。第２の時定
数回路１２は並列に接続された抵抗１４およびコ
ンデンサ１３で構成される。抵抗１４、コンデン
サ１３による時定数はSWRの急激な変化に追従
できる保持時間が得られる数値とする。アンテナ
不整合検出器１０の端子１０ａから第２の時定数
回路１２の端子１２ａへ送出された信号すなわち
第２のALC電圧はダイオード１５を介して可変
利得増幅器２の端子２ａへ出力される。なお、ダ
イオード１５および１６は第１および第２の時定
数回路７，１２における干渉防止用である。
FIG. 2 is a block diagram showing an embodiment of the ALC circuit of the present invention, and FIG. 2 will be explained below. In the figure, 2 is a variable gain amplifier, 3 is a transmission final stage, and
The ALC voltage detection means includes an overdrive detector 4,
It consists of a comparator 5, the output side of which is connected to a capacitor 8 and a resistor 9 of a first time constant circuit 7, and the other ends of the capacitor 8 and resistor 9 are grounded. The second time constant circuit 12 is composed of a resistor 14 and a capacitor 13 connected in parallel. The time constants of the resistor 14 and capacitor 13 are set to values that provide a holding time that can follow sudden changes in SWR. The signal sent from the terminal 10a of the antenna mismatch detector 10 to the terminal 12a of the second time constant circuit 12, that is, the second ALC voltage, is outputted to the terminal 2a of the variable gain amplifier 2 via the diode 15. Note that the diodes 15 and 16 are used to prevent interference in the first and second time constant circuits 7 and 12.
ここで、移動無線等で送信中、オーバドライブ
となり、かつSWRが悪化し、第１および第２の
時定数回路７，１２から、それぞれ、第１ならび
に第２のALC電圧が出力されると、第１および
第２のALC電圧に応じて可変利得増幅器２は制
御を受ける。SWRが平常となると第２のALC電
圧は従来の時定数に比べて比較的短い時定数で複
帰するから可変利得増幅器２は第１のALC電圧
でのみ制御をうける。送信終段部３が平常のとき
アンテナ不整合検出器１０が動作し第２のALC
電圧が生成されると比較的短い時定数を持つ第２
の時定数回路１２により第２のALC電圧は保持
されているから不整合の状態が解消されると可変
利得増幅器２の動作特性はこれに追従して平常に
復帰する。 Here, when an overdrive occurs during transmission with a mobile radio or the like, and the SWR deteriorates, and the first and second ALC voltages are output from the first and second time constant circuits 7 and 12, respectively, The variable gain amplifier 2 is controlled depending on the first and second ALC voltages. When the SWR becomes normal, the second ALC voltage repeats with a relatively short time constant compared to the conventional time constant, so the variable gain amplifier 2 is controlled only by the first ALC voltage. When the transmission final stage 3 is normal, the antenna mismatch detector 10 operates and the second ALC is activated.
Once the voltage is generated, a second voltage with a relatively short time constant
Since the second ALC voltage is held by the time constant circuit 12, when the mismatch state is eliminated, the operating characteristics of the variable gain amplifier 2 follow this and return to normal.
なお、本発明ではアンテナ不整合、各部温度上
昇（図示してない）等の個々の原因に対し、それ
ぞれ専用の時定数回路を設けてあるから送信終段
部３とアンテナ６との間にカツプラを設定し、調
整する際従来に比べて調整が容易となる利点があ
る。 In addition, in the present invention, dedicated time constant circuits are provided for each cause such as antenna mismatch and temperature rise in each part (not shown), so there is no coupling between the transmitting final stage section 3 and the antenna 6. It has the advantage of being easier to set and adjust than the conventional method.
本発明になるALC回路は複数のALC電圧検出
手段と、ALC電圧の保持時間を定める複数の時
定数回路とを具備した構成としてあるため、個々
の制御情報に対し、それぞれ、専用の時定数回路
を設けてあり、このため時定数に係わる各部定数
の設定が容易となり、個々の現象に対し常に適切
なレスポンス特性が得られる効果がある。
Since the ALC circuit according to the present invention has a configuration including a plurality of ALC voltage detection means and a plurality of time constant circuits that determine the holding time of the ALC voltage, a dedicated time constant circuit is provided for each piece of control information. Therefore, it is easy to set the constants of each part related to the time constant, and there is an effect that appropriate response characteristics can always be obtained for each phenomenon.
第１図は従来のALC回路のブロツク図、第２
図は本発明のALC回路の一実施例を示すブロツ
ク図である。
１…端子、２…可変利得増幅器、３…送信終段
部、４…オーバドライブ検出器、５，１１…比較
器、６…アンテナ、７…第１の時定数回路、８，
１３…コンデンサ、９，１４…抵抗、１０…アン
テナ不整合検出器、１２…第２の時定数回路。
Figure 1 is a block diagram of a conventional ALC circuit, Figure 2 is a block diagram of a conventional ALC circuit.
The figure is a block diagram showing one embodiment of the ALC circuit of the present invention. 1... Terminal, 2... Variable gain amplifier, 3... Transmission final stage section, 4... Overdrive detector, 5, 11... Comparator, 6... Antenna, 7... First time constant circuit, 8,
13... Capacitor, 9, 14... Resistor, 10... Antenna mismatch detector, 12... Second time constant circuit.
Claims (1)
する信号（以下、ALCと云う）を出力するALC
電圧検出手段と、送信終段部とを具備し、前記
ALC電圧に応じて可変利得手段を制御し、前記
送信終段部を保護するよう構成された送信機又は
送受信機の送信部に係わるALC回路において、
送信電力を検出する第１のALC検出手段と、反
射波を検出する第２のALC検出手段と、前記第
１および第２のALC検出手段に縦続結線される
保持時間の異なる第１の時定数回路と、第２の時
定数回路とを具備し、前記第１および第２の時定
数回路のALC出力電圧で、前記可変利得手段を
制御するよう構成したことを特徴とするALC回
路。1. A variable gain means and an ALC that outputs a signal for controlling the gain of the variable gain means (hereinafter referred to as ALC)
comprising a voltage detection means and a transmission final stage section;
In an ALC circuit related to a transmitting section of a transmitter or transceiver configured to control a variable gain means according to an ALC voltage and protect the transmitting final stage section,
a first ALC detection means for detecting transmission power; a second ALC detection means for detecting reflected waves; and a first time constant having a different retention time and connected in cascade to the first and second ALC detection means. circuit, and a second time constant circuit, and is configured to control the variable gain means using the ALC output voltages of the first and second time constant circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11400083A JPS607215A (en) | 1983-06-24 | 1983-06-24 | Alc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11400083A JPS607215A (en) | 1983-06-24 | 1983-06-24 | Alc circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS607215A JPS607215A (en) | 1985-01-16 |
| JPH0142163B2 true JPH0142163B2 (en) | 1989-09-11 |
Family
ID=14626551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11400083A Granted JPS607215A (en) | 1983-06-24 | 1983-06-24 | Alc circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS607215A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63314050A (en) * | 1987-06-17 | 1988-12-22 | Matsushita Electric Ind Co Ltd | Transmitter |
| JPS63314051A (en) * | 1987-06-17 | 1988-12-22 | Matsushita Electric Ind Co Ltd | Transmitter |
| JPH02111918U (en) * | 1989-02-20 | 1990-09-07 | ||
| ATE393980T1 (en) * | 2002-08-01 | 2008-05-15 | Ericsson Telefon Ab L M | CIRCUIT FOR POWER AMPLIFIER |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53147450A (en) * | 1977-05-27 | 1978-12-22 | Mitsubishi Electric Corp | Directional coupler |
| JPS56123030U (en) * | 1980-02-15 | 1981-09-18 | ||
| JPS56134811A (en) * | 1980-03-24 | 1981-10-21 | Sony Corp | Gain control circuit |
-
1983
- 1983-06-24 JP JP11400083A patent/JPS607215A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS607215A (en) | 1985-01-16 |
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