JPH0789622B2 - Receiving machine - Google Patents
Receiving machineInfo
- Publication number
- JPH0789622B2 JPH0789622B2 JP59273244A JP27324484A JPH0789622B2 JP H0789622 B2 JPH0789622 B2 JP H0789622B2 JP 59273244 A JP59273244 A JP 59273244A JP 27324484 A JP27324484 A JP 27324484A JP H0789622 B2 JPH0789622 B2 JP H0789622B2
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- field strength
- output
- amplifier
- frequency amplifier
- 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 - Lifetime
Links
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は、移動無線装置等の無線周波増幅器を具備した
受信機に関するものである。Description: TECHNICAL FIELD The present invention relates to a receiver including a radio frequency amplifier such as a mobile radio device.
一般にこのような受信機は、第３図の機能ブロック図に
示すように、受信アンテナ11、無線周波（RF）増幅器1
2、RFフィルタ13、ミクサー（MIX）14,16、中間周波（I
F）フィルタ15,17、IF増幅器18,20、IF段間フィルタ19
およびディスクリミネータ21とから構成されている。Generally, such a receiver has a receiving antenna 11, a radio frequency (RF) amplifier 1 as shown in the functional block diagram of FIG.
2, RF filter 13, mixer (MIX) 14,16, intermediate frequency (I
F) Filters 15,17, IF amplifiers 18,20, IF interstage filter 19
And a discriminator 21.
受信アンテナ11で微小な電波Rを受信すると、まずRF
増幅器12で受信電波を増幅して感度を上げ、RFフィルタ
13により主として第1IFイメージからなる受信不要電波
（スプリアス）を除去する。次に感度を上げた受信電波
′Ｒは第１のMIX14により所定の周波数L1と混合し
て第１の中間周波数IF1となり、第１のIFフィルタ15
で第１の中間周波数IF1以外の周波数を除去する。さ
らにこの第１の中間周波数IF1を第２のMIX16で所定の
周波数L2と混合させ選択度を取り易く、増幅し易い第
２の中間周波数IF2を抽出し、第２のIFフィルタ17で
この第２の中間周波数IF2以外の周波数を除去して選
択度を良くする。次に該第２の中間周波数IF2は、IF
増幅器18,20で必要な利得を得て、IF段間フィルタ19に
よって前記IF増幅器18で発生するノイズを帯域制限され
た後にディスクリミネータ21でFM復調された可聴周波数
AFとして出力していた。When a small radio wave R is received by the receiving antenna 11, first RF
The amplifier 12 amplifies the received radio waves to increase the sensitivity, and the RF filter
By 13, the unnecessary reception radio waves (spurious) mainly composed of the first IF image are removed. Next, the received radio wave ' R with increased sensitivity is mixed with a predetermined frequency L1 by the first MIX 14 to become the first intermediate frequency IF1 and the first IF filter 15
Then, frequencies other than the first intermediate frequency IF1 are removed. Further, the first intermediate frequency IF1 is mixed with a predetermined frequency L2 by the second MIX16 to extract a second intermediate frequency IF2 which is easy to obtain selectivity and is easy to amplify, and the second IF filter 17 extracts the second intermediate frequency IF2 . The frequencies other than the intermediate frequency IF2 of are removed to improve the selectivity. The second intermediate frequency IF2 is then IF
Audio frequencies demodulated in FM by the discriminator 21 after the gains required by the amplifiers 18 and 20 are obtained and the noise generated in the IF amplifier 18 is band-limited by the IF inter-stage filter 19.
It was output as AF.
しかし、上記のような受信機では、RF増幅器の利得を受
信電波の電界強度の低限と決め、最悪条件でも十分な感
度が得られるように定めているので、十分な感度が得ら
れる場所でのRF増幅器の使用は不要である。特にコード
レス電話の様に移動後は、ほとんど同一の場所で使用す
るので大きな電界強度の変化はなく、RF増幅器は不必要
となる場合がある。However, in the receiver as described above, the gain of the RF amplifier is determined to be the lower limit of the electric field strength of the received radio wave, and it is determined that sufficient sensitivity can be obtained even in the worst condition, so in a place where sufficient sensitivity can be obtained. The use of an RF amplifier is unnecessary. In particular, after moving like a cordless telephone, since it is used at almost the same place, there is no large change in electric field strength, and the RF amplifier may be unnecessary.
またRF増幅器は、受信アンテナがひろった妨害波をも同
時に増幅しているので耐妨害性に劣っている等の問題点
があった。Further, the RF amplifier also has a problem that it is inferior in interference resistance because it also amplifies the interference wave picked up by the receiving antenna at the same time.
本発明は、上記問題点に鑑みなされたもので、適宜無線
周波増幅器を動作させることにより動作特性の良好な受
信機を提供することを目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide a receiver having good operating characteristics by appropriately operating a radio frequency amplifier.
そこで、本発明は中間周波増幅器の電界強度レベルによ
り無線周波増幅器への電源供給のオン，オフ制御を行な
うことによって上記目的を達成した。Therefore, the present invention achieves the above object by controlling the ON / OFF of the power supply to the radio frequency amplifier according to the electric field strength level of the intermediate frequency amplifier.
本発明の実施例を第１図乃至第２図の図面に基づいて説
明する。An embodiment of the present invention will be described with reference to the drawings of FIGS.
第１図は本発明の機能ブロック図で、第１図のブロック
に整流回路22、制御回路23、電源スイッチ24、RF増幅器
12の電源25とから成る電界検出回路26を接続して構成さ
れている。なお第３図と同一構成部分は説明の都合上同
一符号とする。FIG. 1 is a functional block diagram of the present invention. The block of FIG. 1 includes a rectifier circuit 22, a control circuit 23, a power switch 24, and an RF amplifier.
An electric field detection circuit 26 composed of twelve power supplies 25 is connected. The same components as those in FIG. 3 are designated by the same reference numerals for convenience of description.
IF増幅器20の出力は、整流回路22により整流され、この
整流出力は制御回路23によって電界強度のレベル判定が
行なわれ、この整流出力が高電界であるか否かにより電
源スイッチ24のオン，オフを制御する。The output of the IF amplifier 20 is rectified by the rectifier circuit 22, and the rectified output is subjected to the level determination of the electric field strength by the control circuit 23. The power switch 24 is turned on and off depending on whether the rectified output is a high electric field. To control.
ここでRF増幅器12の動作時の利得をG+〔dB〕、機能停止
時では回路上アッテネータのように見えるので減衰量を
G-〔dB〕とすると、該RF増幅器12の機能がオン時とオフ
時とでの利得の差は（G+＋G-）〔dB〕となる。また整流
出力レベルは、電界強度と比例しているので、RF増幅器
12の機能（増幅動作）がオン時、オフ時での電界強度と
整流回路22の出力レベルの関係は第２図の30,40の様に
なる。この第２図において、電界強度EoはRF増幅器12の
オン，オフを規定するスレッシュホールドであり、RF増
幅器12がオンの時の電界強度Eoに対する整流回路22の出
力レベルはＡに対応する。またオフの時の電界強度Eoに
対する出力レベルはＢに対応する。よって整流出力レベ
ルがＡより高い時制御回路23は高電界であるとレベル判
定し、RF増幅器12の電源スイッチ24をオフにし、RF増幅
器の機能を停止させ、電界強度と整流回路22の出力レベ
ルの関係は30から40に自動的に切り換わり、出力レベル
をＢに対応させる。また受信機の移動により整流出力レ
ベルがＢより低くなると、制御回路は低電界であるとレ
ベル判定し、RF増幅器12の電源スイッチ24をオンにし、
RF増幅器12を動作させ、電界強度と出力レベルの関係は
40から30に自動的に切り換わり、出力レベルをＡに対応
させ、正しい電界強度判定を行なえる。Here, the gain when the RF amplifier 12 is operating is G + [dB], and when it stops functioning, it looks like an attenuator on the circuit.
When G − [dB] is set, the difference in gain between when the function of the RF amplifier 12 is on and when it is off is (G + + G − ) [dB]. The rectified output level is proportional to the electric field strength, so the RF amplifier
The relationship between the electric field strength and the output level of the rectifier circuit 22 when the 12 functions (amplifying operation) are on and off are as shown by 30, 40 in FIG. In FIG. 2, the electric field strength E o is a threshold that defines ON / OFF of the RF amplifier 12, and the output level of the rectifier circuit 22 with respect to the electric field strength E o when the RF amplifier 12 is ON corresponds to A. . The output level corresponding to the electric field strength E o when it is off corresponds to B. Therefore, when the rectified output level is higher than A, the control circuit 23 determines that the electric field is a high electric field, turns off the power switch 24 of the RF amplifier 12, stops the function of the RF amplifier, and the electric field strength and the output level of the rectified circuit 22. The relationship of is automatically switched from 30 to 40, and the output level corresponds to B. When the rectified output level becomes lower than B due to the movement of the receiver, the control circuit determines that the electric field is low, and turns on the power switch 24 of the RF amplifier 12,
The RF amplifier 12 is operated and the relationship between the electric field strength and the output level is
It automatically switches from 40 to 30, and makes the output level correspond to A so that the correct electric field strength can be judged.
以上説明したように、本発明は受信電界強度のレベルに
より無線周波増幅器の電源のオン，オフ制御ができるの
で、無線周波増幅器は電界強度が高電界であるか、否か
により自動的に動作したり、停止したりすることができ
る。したがって無線周波増幅器の機能が停止している時
受信機の消費電力は少量となり、相互変調特性や感度抑
圧特性等の耐干渉性が良くなる効果を奏し、電界強度の
変化が頻繁に起こる移動無線装置には好適である。As described above, according to the present invention, since the power supply of the radio frequency amplifier can be turned on / off by the level of the received electric field strength, the radio frequency amplifier automatically operates depending on whether the electric field strength is a high electric field or not. It can be stopped or stopped. Therefore, the power consumption of the receiver is small when the function of the radio frequency amplifier is stopped, and the effect of improving the interference resistance such as the intermodulation characteristic and the sensitivity suppression characteristic is achieved, and the mobile radio frequency field strength frequently changes. Suitable for devices.
第１図は本発明の一実施例の機能ブロック図、第２図は
受信電波の電界強度と中間周波増幅器の整流出力の関係
を示す図、第３図は従来のダブルスーパーヘテロダイン
方式による受信装置の機能ブロック図である。 11……受信アンテナ、12……無線周波（RF）増幅器、13
……RFフィルタ、14,16……ミクサー（MIX）、15,17…
…中間周波（IF）フィルタ、18,20……中間周波（IF）
増幅器、19:IF段間フィルタ、21……ディスクリミネー
タ、22……整流回路、23……制御回路、24……電源スイ
ッチ、25……電源、26……電界検出回路、30,40……無
線周波増幅器がオン時，オフ時の整流出力。FIG. 1 is a functional block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the electric field strength of a received radio wave and the rectified output of an intermediate frequency amplifier, and FIG. 3 is a conventional double superheterodyne receiver. It is a functional block diagram of. 11 ... Receiving antenna, 12 ... Radio frequency (RF) amplifier, 13
...... RF filter, 14,16 …… Mixer (MIX), 15,17…
… Intermediate frequency (IF) filter, 18,20 …… Intermediate frequency (IF)
Amplifier, 19: IF interstage filter, 21 ... Discriminator, 22 ... Rectifier circuit, 23 ... Control circuit, 24 ... Power switch, 25 ... Power supply, 26 ... Electric field detection circuit, 30, 40 ... … Rectified output when the radio frequency amplifier is on and off.
Claims (1)
増幅器とを具備して受信電波の中間周波数復調を行なう
移動無線装置の受信機において、 前記中間周波増幅器の出力を整流する整流回路と、この
整流回路の出力により受信電波の電界強度が所定の値よ
り大きいか否かの判定を行なう電界強度判定回路を具
え、 前記無線周波増幅器がオンの時の前記所定の電界強度の
値に対応する前記整流回路の出力を第１の出力レベルと
し、前記無線周波増幅器がオフの時の前記所定の電界強
度の値に対応する前記整流回路の出力を第２の出力レベ
ルとしたとき、前記電界強度判定回路は前記整流回路の
出力が前記第１の出力レベルより大きいとき受信電波の
電界強度が所定の値より大きいと判定して前記無線周波
増幅器への電源供給をオフする制御をし、前記整流回路
の出力が前記第２の出力レベルより小さいとき受信電波
の電界強度が所定の値より小さいと判定して前記無線周
波増幅器への電源供給をオンする制御をすることを特徴
とする受信機。1. A receiver of a mobile radio apparatus comprising a radio frequency amplifier, a mixer, and an intermediate frequency amplifier for performing intermediate frequency demodulation of received radio waves, and a rectifying circuit for rectifying an output of the intermediate frequency amplifier, An output of the rectifying circuit is provided, which comprises an electric field strength judgment circuit for judging whether the electric field strength of the received radio wave is larger than a predetermined value or not, which corresponds to the predetermined electric field strength value when the radio frequency amplifier is on. When the output of the rectifier circuit is at a first output level and the output of the rectifier circuit corresponding to the value of the predetermined electric field strength when the radio frequency amplifier is off is at a second output level, the electric field strength is The judgment circuit judges that the electric field strength of the received radio wave is larger than a predetermined value when the output of the rectifier circuit is larger than the first output level, and turns off the power supply to the radio frequency amplifier. However, when the output of the rectifier circuit is smaller than the second output level, it is determined that the electric field strength of the received radio wave is smaller than a predetermined value, and the power supply to the radio frequency amplifier is turned on. Receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59273244A JPH0789622B2 (en) | 1984-12-26 | 1984-12-26 | Receiving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59273244A JPH0789622B2 (en) | 1984-12-26 | 1984-12-26 | Receiving machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61152132A JPS61152132A (en) | 1986-07-10 |
| JPH0789622B2 true JPH0789622B2 (en) | 1995-09-27 |
Family
ID=17525129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59273244A Expired - Lifetime JPH0789622B2 (en) | 1984-12-26 | 1984-12-26 | Receiving machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0789622B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003101426A (en) * | 2001-09-20 | 2003-04-04 | Clarion Co Ltd | Broadcasting receiver |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54119819A (en) * | 1978-03-09 | 1979-09-18 | Nec Corp | Radio receiver |
| JPH0117855Y2 (en) * | 1980-05-19 | 1989-05-24 | ||
| JPS57151017U (en) * | 1981-03-16 | 1982-09-22 |
-
1984
- 1984-12-26 JP JP59273244A patent/JPH0789622B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61152132A (en) | 1986-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |