JPH04258006A - Gain controller - Google Patents
Gain controllerInfo
- Publication number
- JPH04258006A JPH04258006A JP1966091A JP1966091A JPH04258006A JP H04258006 A JPH04258006 A JP H04258006A JP 1966091 A JP1966091 A JP 1966091A JP 1966091 A JP1966091 A JP 1966091A JP H04258006 A JPH04258006 A JP H04258006A
- Authority
- JP
- Japan
- Prior art keywords
- gain control
- gain
- control circuit
- signal
- manual
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は利得制御装置に関し、特
に見通し内無線送受信装置等に用いられる利得制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gain control device, and more particularly to a gain control device used in line-of-sight radio transmitting/receiving devices.
【０００２】0002
【従来の技術】従来この種の無線送受信装置の受信系に
用いられる利得制御装置について、図２に示されるブロ
ック図を用いて説明する。2. Description of the Related Art A gain control device conventionally used in a receiving system of this type of radio transmitting/receiving device will be explained with reference to a block diagram shown in FIG.
【０００３】この利得制御装置は、ＩＮ端子から入力さ
れる高周波信号が高入力レベルであるときに利得制御動
作を行う利得制御回路１と、高周波信号が低入力レベル
であるときに周波数変換器２によって周波数変換された
あとの中間周波信号の利得制御動作を行い出力信号をＯ
ＵＴ端子に出力する利得制御回路３とを有している。利
得制御回路１（又は３）は、自動利得制御動作（ＡＵＴ
Ｏ）と手動利得制御動作（ＭＡＮＵＡＬ）が行えるよう
になっており、利得制御された信号の出力レベルを検出
する検波部４（又は５）と、利得制御回路１（又は３）
内の増幅器等の利得変化機能を有する回路の利得制御を
行う利得制御部６（又は７）を有している。This gain control device includes a gain control circuit 1 that performs a gain control operation when a high frequency signal input from an IN terminal has a high input level, and a frequency converter 2 that performs a gain control operation when the high frequency signal input from an IN terminal has a low input level. Performs gain control operation on the intermediate frequency signal after frequency conversion by
It has a gain control circuit 3 that outputs to the UT terminal. The gain control circuit 1 (or 3) performs automatic gain control operation (AUT
0) and manual gain control operation (MANUAL), the detection unit 4 (or 5) detects the output level of the gain-controlled signal, and the gain control circuit 1 (or 3).
It has a gain control section 6 (or 7) that controls the gain of a circuit having a gain changing function such as an amplifier within the device.
【０００４】このような構成の利得制御装置を有する無
線送受信装置等の受信系においては、その振幅特性を測
定する際には、利得制御装置を固定利得とするため、手
動動作の状態にして測定をしなければならない。このと
き、利得制御回路１の出力信号レベルを調整するには、
利得制御部６を操作する必要があり、利得制御回路２の
出力信号レベルを調整するには、利得制御部７を操作す
る必要がある。[0004] When measuring the amplitude characteristics of a receiving system such as a radio transmitting/receiving device having a gain control device having such a configuration, the gain control device is set to a fixed gain, so the measurement is performed with the gain control device in a manual operation state. must be done. At this time, to adjust the output signal level of the gain control circuit 1,
It is necessary to operate the gain control section 6, and in order to adjust the output signal level of the gain control circuit 2, it is necessary to operate the gain control section 7.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来の利得制
御装置は、手動動作の状態においては、２つの利得制御
回路の出力信号レベルを調整するためには、それぞれの
利得制御回路内の利得制御部を各々制御しなければなら
ず、各々の出力信号レベルを監視しながら交互に調整し
なければならないといった煩わしさがあった。[Problems to be Solved by the Invention] In the above-mentioned conventional gain control device, in a state of manual operation, in order to adjust the output signal level of the two gain control circuits, it is necessary to adjust the gain control within each gain control circuit. It is troublesome that each section must be controlled individually, and the output signal level of each section must be monitored and adjusted alternately.
【０００６】従って本発明の目的は、適切な信号出力レ
ベルが効率的に設定でき、且つ唯１つの利得制御部によ
って２つの利得制御回路を操作することができる利得制
御装置を提供することにある。Therefore, an object of the present invention is to provide a gain control device that can efficiently set an appropriate signal output level and that can operate two gain control circuits using only one gain control section. .
【０００７】[0007]
【課題を解決するための手段】本発明による利得制御装
置は、制御信号により入力された信号の利得制御を行う
第１の利得制御回路と、前記第１の利得制御回路の後段
に接続され制御信号により入力された信号の利得制御を
行う第２の利得制御回路と、第１の利得制御回路から出
力される信号の出力レベルを検出する検波部と、前記出
力レベルを予め定められた基準レベルと比較する電圧比
較器と、前記第１および第２の利得制御回路の手動動作
時の利得を設定する手動制御信号を出力する手段を有す
る利得制御部と、前記比較された出力レベルが高レベル
の場合には前記第１の利得制御回路の利得設定手段に、
前記比較された出力レベルが低レベルの場合には前記第
２の利得制御回路の利得設定手段に、前記手動制御信号
を切り替えて出力する手動制御信号切り替え手段と、を
有する。[Means for Solving the Problems] A gain control device according to the present invention includes a first gain control circuit that performs gain control of an input signal using a control signal, and a gain control circuit that is connected to a subsequent stage of the first gain control circuit to control the gain. a second gain control circuit that performs gain control of the input signal according to the signal; a detection unit that detects the output level of the signal output from the first gain control circuit; and a detection unit that sets the output level to a predetermined reference level. a voltage comparator that compares the output level to a high level; In this case, the gain setting means of the first gain control circuit includes:
The gain setting means of the second gain control circuit includes manual control signal switching means for switching and outputting the manual control signal when the compared output level is a low level.
【０００８】[0008]
【実施例】次に、本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.
【０００９】図１は、本発明の一実施例のブロック図で
ある。FIG. 1 is a block diagram of one embodiment of the present invention.
【００１０】この利得制御装置は、従来例と同様に、Ｉ
Ｎ端子より入力された高周波信号が高入力レベルである
ときに利得制御を行う利得制御回路１と、高周波信号を
中間周波信号に周波数変換する周波数変換器２と、高周
波信号が低入力レベルであるときに入力された中間周波
信号の利得制御を行いＯＵＴ端子に出力信号を出力する
利得制御回路３とを有している。利得制御回路１（又は
３）は、自動利得制御動作（ＡＵＴＯ）と手動利得制御
動作（ＭＡＮＵＡＬ）が行えるようになっており、利得
制御回路１（又は３）は、利得制御された信号の出力レ
ベルを検出する検波部４（又は５）を有している。[0010] This gain control device, like the conventional example,
A gain control circuit 1 that performs gain control when a high frequency signal input from an N terminal has a high input level, a frequency converter 2 that converts the high frequency signal into an intermediate frequency signal, and a high frequency signal that is at a low input level. It has a gain control circuit 3 that performs gain control of an input intermediate frequency signal and outputs an output signal to an OUT terminal. The gain control circuit 1 (or 3) is capable of performing automatic gain control operation (AUTO) and manual gain control operation (MANUAL), and the gain control circuit 1 (or 3) is capable of outputting a gain-controlled signal. It has a detection section 4 (or 5) that detects the level.
【００１１】又、利得制御回路１は、出力レベルを予め
定められた基準レベルと比較する電圧比較器８を有して
いる。The gain control circuit 1 also includes a voltage comparator 8 for comparing the output level with a predetermined reference level.
【００１２】一方、利得制御回路３は、この回路の利得
を一定値に設定する固定バイス回路９と、電圧比較器８
によって比較された出力レベルが高レベルの場合には、
固定バイアス回路９を利得制御回路３に接続する切り替
え器１０とを有している。On the other hand, the gain control circuit 3 includes a fixed bias circuit 9 that sets the gain of this circuit to a constant value, and a voltage comparator 8.
If the output level compared by is high, then
It has a switch 10 that connects the fixed bias circuit 9 to the gain control circuit 3.
【００１３】利得制御回路１及び３の外部には、利得制
御回路１及び３の手動利得を設定する手動制御信号を出
力する手段を有する利得制御部１１と、電圧比較器８に
よって比較された出力レベルが高レベルの場合には利得
制御部１１からの手動制御信号を利得制御回路１に，比
較された出力レベルが低レベルの場合には手動制御信号
を利得制御回路３に切替えて出力する切り替え器１２と
を有する。Externally to the gain control circuits 1 and 3, there is a gain control section 11 having means for outputting a manual control signal for setting manual gains of the gain control circuits 1 and 3, and an output compared by a voltage comparator 8. Switching to switch and output the manual control signal from the gain control section 11 to the gain control circuit 1 when the level is high, and to switch and output the manual control signal to the gain control circuit 3 when the compared output level is low. It has a container 12.
【００１４】次に、この利得制御装置の手動状態におけ
る動作について説明する。入力された高周波信号が、高
入力レベル時には、利得制御回路３には固定バイアス回
路９が接続され、利得制御回路３は固定利得となる。こ
のときは、利得制御回路１のみ、利得制御部１１により
手動で利得制御ができる。また、低入力レベル時には、
検波部４によって検出された出力が低下するため、切り
替え器１０は利得制御回路１を固定バイアス回路９から
切り離してその最大利得とし、切り替え器１２は利得制
御部１１からの手動制御信号を利得制御回路３に切り替
え、利得制御回路３の手動での利得制御ができる。Next, the operation of this gain control device in the manual state will be explained. When the input high frequency signal is at a high input level, the fixed bias circuit 9 is connected to the gain control circuit 3, and the gain control circuit 3 has a fixed gain. At this time, the gain of only the gain control circuit 1 can be manually controlled by the gain control section 11. Also, at low input levels,
Since the output detected by the detection section 4 decreases, the switch 10 separates the gain control circuit 1 from the fixed bias circuit 9 to set its maximum gain, and the switch 12 switches the manual control signal from the gain control section 11 to gain control. By switching to circuit 3, manual gain control of gain control circuit 3 can be performed.
【００１５】[0015]
【発明の効果】以上説明したように本発明による利得制
御装置は、振幅特性測定時等において固定利得とされる
必要のある手動動作時には、入力信号レベルを検出し、
そのレベルを判断して２つの利得制御回路の利得制御方
法を自動的に選択することができ、且つ２つの利得制御
回路を１つの利得制御部によって利得制御することがで
きるため、振幅特性測定の効率化ならびに装置の簡素化
がはかれるという効果がある。As explained above, the gain control device according to the present invention detects the input signal level during manual operation that requires a fixed gain during amplitude characteristic measurement, etc.
The level can be judged and the gain control method of the two gain control circuits can be automatically selected, and the two gain control circuits can be gain controlled by one gain control section, making it easy to measure amplitude characteristics. This has the effect of increasing efficiency and simplifying the device.
【図１】本発明の一実施例による利得制御装置のブロッ
ク図である。FIG. 1 is a block diagram of a gain control device according to an embodiment of the present invention.
【図２】従来の利得制御装置のブロック図である。FIG. 2 is a block diagram of a conventional gain control device.
１，３ 利得制御回路 ２ 周波数変換器 ４，５ 検波器 ６，７，１１ 利得制御部 ８ 電圧比較器 ９ 固定バイアス回路 １０，１２ 切り替え器 1, 3 Gain control circuit 2 Frequency converter 4,5 Detector 6, 7, 11 Gain control section 8 Voltage comparator 9 Fixed bias circuit 10,12 Switcher
Claims (1)
制御を行う第１の利得制御回路と、前記第１の利得制御
回路の後段に接続され制御信号により入力された信号の
利得制御を行う第２の利得制御回路と、第１の利得制御
回路から出力される信号の出力レベルを検出する検波部
と、前記出力レベルを予め定められた基準レベルと比較
する電圧比較器と、前記第１および第２の利得制御回路
の手動動作時の利得を設定する手動制御信号を出力する
手段を有する利得制御部と、前記比較された出力レベル
が高レベルの場合には前記第１の利得制御回路の利得設
定手段に、前記比較された出力レベルが低レベルの場合
には前記第２の利得制御回路の利得設定手段に、前記手
動制御信号を切り替えて出力する手動制御信号切り替え
手段と、を有することを特徴とする利得制御装置。1. A first gain control circuit that controls the gain of an input signal using a control signal, and a second gain control circuit that is connected after the first gain control circuit and that controls the gain of a signal input using a control signal. a detection section that detects the output level of the signal output from the first gain control circuit; a voltage comparator that compares the output level with a predetermined reference level; a gain control section having means for outputting a manual control signal for setting a gain during manual operation of the second gain control circuit; The gain setting means includes manual control signal switching means for switching and outputting the manual control signal to the gain setting means of the second gain control circuit when the compared output level is a low level. A gain control device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1966091A JP2778260B2 (en) | 1991-02-13 | 1991-02-13 | Gain control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1966091A JP2778260B2 (en) | 1991-02-13 | 1991-02-13 | Gain control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04258006A true JPH04258006A (en) | 1992-09-14 |
| JP2778260B2 JP2778260B2 (en) | 1998-07-23 |
Family
ID=12005404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1966091A Expired - Lifetime JP2778260B2 (en) | 1991-02-13 | 1991-02-13 | Gain control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2778260B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081701A (en) * | 1997-04-21 | 2000-06-27 | Nec Corporation | Gain controller |
| EP1168605A2 (en) * | 2000-06-26 | 2002-01-02 | Matsushita Electric Industrial Co., Ltd. | Automatic gain control apparatus |
-
1991
- 1991-02-13 JP JP1966091A patent/JP2778260B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081701A (en) * | 1997-04-21 | 2000-06-27 | Nec Corporation | Gain controller |
| EP1168605A2 (en) * | 2000-06-26 | 2002-01-02 | Matsushita Electric Industrial Co., Ltd. | Automatic gain control apparatus |
| EP1168605A3 (en) * | 2000-06-26 | 2004-10-13 | Matsushita Electric Industrial Co., Ltd. | Automatic gain control apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2778260B2 (en) | 1998-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6671503B1 (en) | Wireless microphone system | |
| KR0179968B1 (en) | Sound signal output circuit and the method | |
| US5507022A (en) | Electric field level detecting apparatus | |
| US6496017B2 (en) | Measuring antenna signal strength with automatic gain control receiver | |
| US6501735B1 (en) | Self-diagnostic method for detecting faults in a transceiver within a wireless receiving unit of a base transceiver station | |
| JPH09229770A (en) | Optical power meter | |
| JPH04258006A (en) | Gain controller | |
| KR100467883B1 (en) | Wireless receiver | |
| JPH05199137A (en) | Agc system | |
| JP2828012B2 (en) | Carrier sense circuit | |
| JPH1117629A (en) | Fault detection circuit for receiver | |
| JPH04222124A (en) | Common-mode synthesizing circuit | |
| JPH03108817A (en) | Transmission output controller | |
| JPS639233A (en) | Detection circuit for control of transmission power | |
| JPS5851609A (en) | Automatic gain controlling circuit | |
| JP3070988B2 (en) | Automatic tuning circuit | |
| JPH0621774A (en) | Automatic channel selection radio receiver | |
| JPH0946255A (en) | Receiving level detecting and displaying method and receiver to which it is applied | |
| JPH09321636A (en) | Transmission output level control circuit | |
| JPH04274628A (en) | Am/fm tuner | |
| JP2002246919A (en) | Automatic level control circuit | |
| JPH1056398A (en) | Device and method for temperature correction of portable radio equipment | |
| JP2000332541A (en) | Circuit and method for frequency conversion | |
| JPH0389694A (en) | Intermediate frequency circuit adjustment device | |
| JPH01119109A (en) | Intermediate frequency amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980407 |