JPH01170121A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPH01170121A JPH01170121A JP32811487A JP32811487A JPH01170121A JP H01170121 A JPH01170121 A JP H01170121A JP 32811487 A JP32811487 A JP 32811487A JP 32811487 A JP32811487 A JP 32811487A JP H01170121 A JPH01170121 A JP H01170121A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- intermodulation
- agc
- frequency
- 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
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 230000005684 electric field Effects 0.000 abstract description 25
- 230000002238 attenuated effect Effects 0.000 abstract description 6
- 230000002452 interceptive effect Effects 0.000 abstract description 4
- 239000002253 acid Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- GGZZISOUXJHYOY-UHFFFAOYSA-N 8-amino-4-hydroxynaphthalene-2-sulfonic acid Chemical compound C1=C(S(O)(=O)=O)C=C2C(N)=CC=CC2=C1O GGZZISOUXJHYOY-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は相互変調妨害を改善するようにＡＧＣ又はＡＴ
Ｔコントロールがなされる受信機に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides an AGC or AT
This relates to a receiver that is T-controlled.
従来の受信機の要部ブロック回路図を第２図に示す。 A block circuit diagram of the main parts of a conventional receiver is shown in FIG.
第２図において、ＡＮＴＩで受信された信号はフィルタ
を備えたＡＮＴ回路２を通過し、ＡＧＣ制御されるＲＦ
増幅回路３で適宜に増幅されて混合回路であるＭ ｉ
ｘ ４に与えられる。このＭ ｉ ｘ４には局部発振器
５より局部発振周波数であるＦｏｓｃが与えられ、この
Ｆｏｓｃと几Ｆ増幅回路３からの信号が混合されて周波
数変換がなされる。In Figure 2, the signal received at the ANTI passes through the ANT circuit 2 equipped with a filter, and then the AGC-controlled RF
M i which is suitably amplified by the amplifier circuit 3 and is a mixing circuit
given to x 4. This M i x4 is given a local oscillation frequency Fosc from the local oscillator 5, and this Fosc and the signal from the F amplifier circuit 3 are mixed to perform frequency conversion.
なお、Ｍ ｉ ｘ ４と局部発振器５により周波数変換
回路が形成されている。さらに、Ｍｉｘ４で周波数変換
された信号が中間周波フィルターであるトランス６に与
えられ、このトランス６により中間周波信号ｆｙが抽出
されて、ＩＦ’増幅回路７に与えられて適宜に増幅され
る。一方、Ｍ ｉ ｘ ４で変換されたトランス６に与
えられた信号の一部は、増幅器８に供給されこの増幅器
８により増幅された後レベル検出回路９に供給される。Note that the M i x 4 and the local oscillator 5 form a frequency conversion circuit. Further, the signal frequency-converted by Mix4 is applied to a transformer 6 which is an intermediate frequency filter, and an intermediate frequency signal fy is extracted by this transformer 6, and is applied to an IF' amplifier circuit 7 where it is appropriately amplified. On the other hand, a part of the signal converted by M i x 4 and applied to the transformer 6 is supplied to the amplifier 8 , amplified by the amplifier 8 , and then supplied to the level detection circuit 9 .
このレベル検出回路９により上記信号はその大きさに応
じた直流信号に変換されてＡＧＣ回路１０に与えられ、
ＡＧＣ回路１０で適宜なＡＧＣ信号に変換され、几Ｆ増
幅回路３に与えられてＡＧＣ制御がなされる。The level detection circuit 9 converts the signal into a DC signal according to its magnitude, and supplies it to the AGC circuit 10.
The signal is converted into an appropriate AGC signal by the AGC circuit 10, and is applied to the F amplifier circuit 3 for AGC control.
ところで、受信すべき所望の信号に近接して強電界の不
所望信号が存在する時、すなわち強電界の不所望信号の
周波数変換された信号がレベル検出回路９の検出範囲に
あれば、この不所望信号に応じたＡＧＣ制御がなされて
ＲＦ増幅回路３の増幅度は低下される。したがって強電
界の不所望信号によりＲ，Ｆ増幅回路３及びＭ ｉ ｘ
４の飽和等を生じることがなく、比較的に相互変調妨
害は少ない。By the way, when an undesired signal with a strong electric field exists in the vicinity of the desired signal to be received, that is, if the frequency-converted signal of the undesired signal with a strong electric field is within the detection range of the level detection circuit 9, this undesired signal is detected. AGC control is performed according to the desired signal, and the amplification degree of the RF amplifier circuit 3 is lowered. Therefore, due to the strong electric field undesired signal, the R, F amplifier circuit 3 and M i x
4 saturation, etc., and intermodulation interference is relatively small.
しかしながら、受信すべき所望の信号の電界が弱く所望
信号の近くに強電界の不所望信号が存在する時、すなわ
ち強電界の不所望信号の周波数変換された信号がレベル
検波回路９の検出レベルにあるならば、ＲＦ増幅器３は
この不所望の信号に応じたＡＧＣ制御がなされ所望の信
号に応じた几Ｆ増幅がなされない。したがって弱い電界
の所望信号の増幅度がさらに低下し、感度劣化を起し易
いという問題があった。However, when the electric field of the desired signal to be received is weak and an undesired signal with a strong electric field exists near the desired signal, that is, the frequency-converted signal of the undesired signal with a strong electric field reaches the detection level of the level detection circuit 9. If so, the RF amplifier 3 is subjected to AGC control according to this undesired signal, and no F amplification is performed according to the desired signal. Therefore, there is a problem that the degree of amplification of a desired signal of a weak electric field is further reduced, and sensitivity deterioration is likely to occur.
又、所望信号から離れて所望信号に悪影響を与える強電
界の不所望信号が存在する時、すなわち強電界の不所望
の周波数変換された信号が中間周波数トランスの通過帯
域外であって減衰されてしまうならば、この不所望の信
号に応じたＡＧＣ制御はなされない。このため、所望の
信号の電界強度に応じてＲＦ増幅回路３はＡＧＣ制御さ
れて、増幅度は比較的に高い。したがって強電界の不所
望信号がＲ，Ｆ増幅回路３及びＭ ｉ ｘ ４を飽和さ
せ、信号のピーク部分がクリップされて歪み、・相互変
調妨害が増大するという問題があった。Also, when there is an undesired signal of a strong electric field that is far away from the desired signal and has an adverse effect on the desired signal, that is, the undesired frequency-converted signal of the strong electric field is outside the passband of the intermediate frequency transformer and is attenuated. If this happens, AGC control will not be performed in response to this undesired signal. Therefore, the RF amplifier circuit 3 is AGC controlled according to the electric field strength of the desired signal, and the degree of amplification is relatively high. Therefore, there is a problem that the undesired signal of the strong electric field saturates the R, F amplifier circuit 3 and M i x 4, and the peak portion of the signal is clipped and distorted, and intermodulation interference increases.
本発明の目的は、上記した従来の各種問題点を解決すべ
くなされたもので感度劣化を起すことなしに相互変調妨
害を改善できるようにした、受信機を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a receiver which has been made to solve the various conventional problems described above and is capable of improving intermodulation interference without deteriorating sensitivity.
かかる目的を達成するために、本発明の受信機は、ＡＧ
Ｃで制御されるＲＦ増幅回路と、この几Ｆ増幅回路で増
幅された信号を局部発振周波数とを混合することにより
、中間周波数に変換する第一の周波数変換手段を備えた
受信機において、ＡＴＴ回路を有するＡＮＴ回路と、こ
のＡＮＴ回路を通過した信号を分配する分配手段と、こ
の分配された信号を局部発振周波数と混合することによ
り中間周波数に変換する第二の周波数変換手段と、この
周波数変換された信号成分から希望信号による中間周波
数を除去するＩＦ除去手段と、この■１・゛除去手段を
通過した不所望妨害信号成分を歪ませる歪発生手段と、
この歪発生手段で発生する相互変調成分を検出するＩＭ
検出手段と、このＩＭ抽出手段による信号レベルで前記
ＡＮＴ回路のＡＴＴを制御する相互変調検出回路を備え
、前記ＡＧＣで制御されるＲＦ増幅回路の前段に上記相
互変調検出回路を介挿したことを特徴とする。In order to achieve such an objective, the receiver of the present invention
ATT an ANT circuit having a circuit, a distribution means for distributing the signal passed through the ANT circuit, a second frequency conversion means for converting the distributed signal into an intermediate frequency by mixing it with a local oscillation frequency, IF removing means for removing the intermediate frequency of the desired signal from the converted signal component; distortion generating means for distorting the undesired interference signal component that has passed through the removing means;
IM that detects intermodulation components generated by this distortion generating means
The present invention includes a detection means and an intermodulation detection circuit that controls the ATT of the ANT circuit using the signal level of the IM extraction means, and the intermodulation detection circuit is inserted before the RF amplifier circuit controlled by the AGC. Features.
相互変調成分のレベルを検出し、ＡＧＣ回路の入力、又
はＡＴＴ回路の入力を得るようにしたので発生する相互
変調のレベルでＡＧＣ又はＡＴＴが駆動する。このため
従来の不所望信号の電界レベルを検出し、ＡＧＣ又はＡ
ＴＴ駆動させた場合と比較すると、適度なＡＧＣ又はＡ
ＴＴ制御によりＡＧＣによる増幅度の低下、又はＡＴＴ
の減衰量の程度は軽減される。したがって、強電界の不
所望信号により相互変調成分の程度に応じＡＴＴ制御が
なされるので必要以上に不所望信号の影響を受けること
なく、受信信号の感度劣化が改善される。また、不所望
信号で相互変調成分が発生しない場合は従来と同様に希
望信号のレベルでＡＧＣを駆動しており、強電界の希望
信号は従来と同様に減衰される。Since the level of the intermodulation component is detected and the input to the AGC circuit or the ATT circuit is obtained, the AGC or ATT is driven by the level of the intermodulation that occurs. For this reason, the electric field level of the undesired signal is detected in the conventional method, and AGC or A
Compared to the case of TT drive, moderate AGC or A
TT control reduces amplification by AGC or ATT
The degree of attenuation is reduced. Therefore, since the ATT control is performed according to the degree of intermodulation components by the undesired signal of the strong electric field, the sensitivity deterioration of the received signal is improved without being influenced by the undesired signal more than necessary. Furthermore, when no intermodulation component occurs due to the undesired signal, the AGC is driven at the level of the desired signal as in the prior art, and the desired signal with a strong electric field is attenuated as in the prior art.
以下、本発明の実施例を第１図を参照して説明する。第
１図は本発明の受信機の一実施例の要部回路ブロック図
である。第１図において、従来例である第２図と同一回
路素子には同一符号を付して重複する説明を省略する。Embodiments of the present invention will be described below with reference to FIG. FIG. 1 is a main circuit block diagram of an embodiment of the receiver of the present invention. In FIG. 1, circuit elements that are the same as those in FIG. 2, which is a conventional example, are given the same reference numerals and redundant explanations will be omitted.
第１図において、第２図と相違するところは、ＡＧＣ制
御されるＲＦ増幅回路の入力段より抽出した信号より相
互変調成分を検出する相互変調検出回路１３を設け、こ
の検出信号によりＡＮＴ入力信号を制御することにある
。The difference between FIG. 1 and FIG. 2 is that an intermodulation detection circuit 13 is provided to detect intermodulation components from the signal extracted from the input stage of the AGC-controlled RF amplifier circuit, and this detection signal is used to detect the ANT input signal. The goal is to control.
まず、構成を説明すると、ＡＮＴ回路２とＡＧＣ制御さ
れるＲＦ増幅回路３の間に分配器１２を介挿する。分配
器１２により分配されたＡＮＴ入力信号が相互変調検出
回路のＲ，Ｆ増幅器１４により増幅されＭ ｉ ｘ １
５に与えられる。このＭ ｉ Ｘ １５は局部発振器５
より局部発振周波数ｆＯ５Ｃが与えられこのｆｏｓｃと
ＲＦ増幅回路１４からの信号が混合されて周波数変換が
なされる。さらにＭ ｉ ｘ １５で周波数変換された
信号より、中間周波数（ｊ”ＩＦ ’）成分のみを除去
するＩＦ除去フィルタ１６をＭ ｉ ｘの後段に設けて
いる。このＩＦ除去フィルタ１６は例えばＦＭ受信器の
場合はｆＩＦである１０．７Ｍ１ｉｚを除去するもので
、セラミックフィルタ等で形成したバンドエリミネータ
又はトラップで構成される。First, to explain the configuration, a distributor 12 is inserted between the ANT circuit 2 and the RF amplifier circuit 3 which is controlled by AGC. The ANT input signal distributed by the divider 12 is amplified by the R, F amplifier 14 of the intermodulation detection circuit, and becomes M i x 1.
given to 5. This M i X 15 is the local oscillator 5
A local oscillation frequency fO5C is given by the fosc, and this fosc and the signal from the RF amplifier circuit 14 are mixed to perform frequency conversion. Furthermore, an IF removal filter 16 that removes only the intermediate frequency (j"IF') component from the signal frequency-converted by M i x 15 is provided at the subsequent stage of M i x. In the case of a filter, it removes the fIF of 10.7M1iz, and is composed of a band eliminator or a trap made of a ceramic filter or the like.
ｆＩＦを除去した信号成分は不所望成分を増幅する歪発
生アンプ１７で増幅することにより相互変調を生ずるス
プリアス成分が増幅される。The signal component from which fIF has been removed is amplified by a distortion generation amplifier 17 that amplifies undesired components, thereby amplifying spurious components that cause intermodulation.
すなわち歪発生アンプでは不所望信号成分の差がｆＩＦ
になる相互変調スプリアス成分が発生する。In other words, in a distortion generating amplifier, the difference between undesired signal components is fIF
Intermodulation spurious components are generated.
ＩＭ抽出フィルタ１８は上記不所望信号により形成され
たｆＩＦである相互変調（Ｉｎｔｅｒｍｏｄｕｌａｔｉ
ｏｎ以降ＩＭと略す）スプリアスを抽出するフィルター
である。ｆＩＦである１０．７ Ｍｆｌｚに同調した上
記の工Ｍ成分のレベルを増幅器１９を介してこのＩＭ酸
成分レベルを検出するレベル検出器加に導く。ＡＴＴ駆
動回路２１はレベル検出器２０のレベルに応じたバイア
ス供給電圧を形成するものであり、このバイアス供給電
圧を前記のＡＮＴ回路２と分配器１２との間に介挿入さ
れるＡＮＴ入力減衰手段であるＡＴＴ回路２２に供給す
る。ＡＴＴ回路ｎはビンダイオード等大入力信号に対し
てもリニアな特性を示す素子で形成され上記のバイアス
供給電圧に応じてＡＮＴ入力信号を減衰させるものであ
る。The IM extraction filter 18 uses intermodulation (intermodulation) which is fIF formed by the above-mentioned undesired signal.
(hereinafter abbreviated as IM) is a filter that extracts spurious signals. The level of the above-mentioned engineered M component tuned to fIF 10.7 Mflz is led via an amplifier 19 to a level detector for detecting the level of this IM acid component. The ATT drive circuit 21 forms a bias supply voltage according to the level of the level detector 20, and applies this bias supply voltage to the ANT input attenuation means inserted between the ANT circuit 2 and the distributor 12. is supplied to the ATT circuit 22. The ATT circuit n is formed of an element such as a bin diode that exhibits linear characteristics even for a large input signal, and attenuates the ANT input signal in accordance with the bias supply voltage.
かかる構成において、希望信号に近接して強電界の妨害
信号が存在し、この強電界の妨害信号の周波数変換され
た信号がＡＧＣのレベル検波回路９の検出範囲にあって
ｆＩＦ成分を有しない場合、すなわち上記のＩＭ酸成分
含まない場合は相互変調検出回路１３のＩＭ抽出フィル
タ１８でＩＭ酸成分検出されないため、ＡＴＴ回路２２
は動作せずにレベル検波回路９により強電界の妨害信号
のレベルに応じたＡＧＣ制御がなされて、ＲＦ増幅回路
３の増幅度が低下する。In such a configuration, if a strong electric field interference signal exists in the vicinity of the desired signal, and the frequency-converted signal of this strong electric field interference signal is within the detection range of the level detection circuit 9 of the AGC and does not have an fIF component. In other words, if the above-mentioned IM acid component is not included, the IM extraction filter 18 of the intermodulation detection circuit 13 will not detect the IM acid component, so the ATT circuit 22
does not operate, and the level detection circuit 9 performs AGC control according to the level of the strong electric field interference signal, and the amplification degree of the RF amplifier circuit 3 decreases.
次に希望信号から離れて、強電界の妨害信号が存在し、
この強電界の周波数変換された信号が、上記のレベル検
波回路の検出範囲になく、ｆＩＦ成分を有する場合、す
なわち上記のＩＭ酸成分含む場合は、相互変調検出回路
１３のＩ Ｍ抽出フィルタ１８でＩＭ酸成分検出され、
このＩＭ酸成分レベルに応じたバイアス電圧に、よりＡ
ＴＴ回路ｎが動作し、ＡＮＴ入力回路の信号が減衰する
。一方この周波数変換された信号がレベル検波回路９の
検出範囲にないことよりＡＧＣ制御はなされず、ＲＦ増
幅器３の増幅度は低下しない。すなわち、妨害信号のＩ
Ｍ酸成分応じた減衰をＡＮＴ入力信号はうけることにな
る。従って、強電界の妨害信号によりＲＦ増幅回路３及
びＭ ｉ ｘ ４を飽和させ、信号のピーク部分がｊリ
ップされて歪むことはなくなり、ＩＭ妨害が生ずること
はない。Next, apart from the desired signal, there is a strong electric field interference signal,
If the frequency-converted signal of this strong electric field is not within the detection range of the above-mentioned level detection circuit and has an fIF component, that is, if it contains the above-mentioned IM acid component, it is detected by the IM extraction filter 18 of the intermodulation detection circuit 13. IM acid component detected,
By adjusting the bias voltage according to this IM acid component level, the A
TT circuit n operates and the signal of the ANT input circuit is attenuated. On the other hand, since this frequency-converted signal is not within the detection range of the level detection circuit 9, AGC control is not performed and the amplification degree of the RF amplifier 3 does not decrease. That is, I of the interference signal
The ANT input signal will be attenuated according to the M acid component. Therefore, the RF amplifier circuit 3 and M i x 4 are saturated by the strong electric field interference signal, the peak portion of the signal is not j-ripped and distorted, and IM interference does not occur.
さらに希望信号に近接して強電界の妨害信号が存在し、
しかもこの周波数変換された信号が上記のレベル検波回
路９の検出範囲内の場合であって妨害信号の周波数変換
信号がｆＩＦ成分を有する場合、すなわちＩＭ酸成分含
む強電界の近接信号の場合は相互変調検出回路１３のＩ
Ｍ検出フィルタで検出されたＩＭ酸成分レベルに応じた
バイアス電圧によりＡＴＴ回路２２が動作してＡＮＴ入
力信号が減衰し、このＡＴＴ回路２２により減衰したＡ
ＮＴ入力信号が几Ｆ増幅回路３に加わり、次段の周波数
変換回路を介して出力されこの出力された信号のレベル
に応じてＡＧＣのレベル検波器９によりＡＧＣ制御がな
される。Furthermore, there is a strong electric field interference signal close to the desired signal.
Moreover, if this frequency-converted signal is within the detection range of the level detection circuit 9, and the frequency-converted signal of the interference signal has an fIF component, that is, if it is a close signal with a strong electric field containing an IM acid component, there is no mutual interaction. I of the modulation detection circuit 13
The ATT circuit 22 is activated by a bias voltage corresponding to the IM acid component level detected by the M detection filter, and the ANT input signal is attenuated.
The NT input signal is applied to the F amplifier circuit 3, output via the next stage frequency conversion circuit, and AGC control is performed by the AGC level detector 9 according to the level of the output signal.
以上の実施例の説明において、相互変調検出回路１３の
局部発振器をＡＧＣ回路１１の局部発振器５と共用して
いるが相互変調検出回路１３の局部発振器をＡＧＣ回路
とは別個に形成しても良いことは勿論である。さらに相
互変調成分を検出しＡＴＴを動作させる相互変調検出回
路へのＡＮＴ入力信号の分配器１２の配置箇所はＡＧＣ
制御されるＲＦ増幅器３の前段であればいずれの箇所で
も良い。In the above description of the embodiment, the local oscillator of the intermodulation detection circuit 13 is shared with the local oscillator 5 of the AGC circuit 11, but the local oscillator of the intermodulation detection circuit 13 may be formed separately from the AGC circuit. Of course. Further, the distributor 12 of the ANT input signal to the intermodulation detection circuit that detects intermodulation components and operates the ATT is arranged at the AGC.
Any location upstream of the RF amplifier 3 to be controlled may be used.
以上説明したように、本発明の受信機によれば、ＩＭ酸
成分発生レベルに応じＡＴＴを動作させるので、受信す
べき希望信号に対し、相互変調を発生する不所望の信号
が近接、又は速性のいずれの範囲に存在しても発生する
相互変調のレベルに応じたＡＴＴ又はＡＧＣ又は双方に
よる適宜の制御がなされ、相互変調妨害を改善出来る。As explained above, according to the receiver of the present invention, since the ATT is operated according to the IM acid component generation level, the undesired signal that causes intermodulation is close to or at high speed with respect to the desired signal to be received. Regardless of the level of intermodulation that occurs, appropriate control is performed by the ATT or AGC, or both, depending on the level of intermodulation that occurs, thereby improving intermodulation interference.
しかも、相互変調を発生しない強い不所望信号ではＡＮ
Ｔ入力信号のＡＴＴ動作はなされないため、強い不所望
信号によりＡＧＣが効きすぎ感度劣化するという不具合
も改善出来るという効果が得られる。Moreover, for strong undesired signals that do not cause intermodulation, the AN
Since the ATT operation of the T input signal is not performed, it is possible to improve the problem that the AGC becomes too effective due to a strong undesired signal and the sensitivity deteriorates.
さらに上記の相互変調検出回路はＩＣ（集積回路）化が
、容易な構成であるので、この部分をＩＣ化すればフィ
ルタ等の１部の外付部品の追加のみでＡＮＴ入力信号選
択の性能改善が計れ、妨害信号の除去に多大の効果を奏
する。Furthermore, since the above-mentioned intermodulation detection circuit has a configuration that can be easily integrated into an IC (integrated circuit), if this part is integrated into an IC, the performance of ANT input signal selection can be improved by simply adding some external components such as a filter. can be measured, and is highly effective in removing interfering signals.
第１図は本発明の受信機の一実施例の要部回路ブロック
図であり、第２図は従来の受信機の要部回路ブロック図
である。
１・・・アンテナ
２・・・ＡＮＴ回路
３・・・ＲＦ増幅器
５・・・局部発振器
１１・・・ＡＧＣ検出回路
１２・・・分配器
１３・・・相互変調検出回路
１４・・・ＲＦ増幅回路
１５・・・Ｍ ｉ ｘ
１６・・・ＩＦ除去フィルタ
１７・・・歪発生アンプ
１８・・・ＩＦ抽出フィルタ
１９・・・増幅器
２０・・・レベル検波器
２１・・・ＡＴＴ駆動回路
２２・・・ＡＴＴ回路
特許出願人 アルプス電気株式会社
代表者 片間 勝太部
察２目FIG. 1 is a block diagram of the main part of a receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram of the main part of a conventional receiver. 1... Antenna 2... ANT circuit 3... RF amplifier 5... Local oscillator 11... AGC detection circuit 12... Distributor 13... Intermodulation detection circuit 14... RF amplification Circuit 15... M i x 16... IF removal filter 17... Distortion generation amplifier 18... IF extraction filter 19... Amplifier 20... Level detector 21... ATT drive circuit 22... ...ATT circuit patent applicant Representative of Alps Electric Co., Ltd. Katsutaka Katama 2nd grade inspector
Claims (2)
回路で増幅された信号を局部発振周波数とを混合するこ
とにより、中間周波数に変換する第一の周波数変換手段
を備えた受信機において、ＡＴＴ回路を有するＡＮＴ手
段と、このＡＮＴ手段を通過した信号を分配する分配手
段と、この分配された信号を局部発振周波数と混合する
ことにより中間周波数に変換する第二の周波数変換手段
と、この周波数変換された信号成分から希望信号による
中間周波数を除去するＩＦ除去手段と、このＩＦ除去手
段を通過した不所望妨害信号成分を歪ませる歪発生手段
と、この歪発生手段で発生する相互変調成分を検出する
ＩＭ検出手段と、このＩＭ抽出手段による信号レベルで
前記ＡＮＴ手段のＡＴＴ回路を制御する相互変調検出回
路を備え、前記ＡＧＣで制御されるＲＦ増幅回路の前段
に上記相互変調検出回路を介挿したことを特徴とする受
信機。(1) In a receiver equipped with an RF amplification circuit controlled by AGC and a first frequency conversion means that converts the signal amplified by the RF amplification circuit to an intermediate frequency by mixing it with a local oscillation frequency, ANT means having an ATT circuit; distribution means for distributing the signal passed through the ANT means; second frequency conversion means for converting the distributed signal into an intermediate frequency by mixing it with a local oscillation frequency; IF removing means for removing the intermediate frequency of the desired signal from the frequency-converted signal component; distortion generating means for distorting the undesired interference signal component that has passed through the IF removing means; and intermodulation components generated by the distortion generating means. and an intermodulation detection circuit for controlling the ATT circuit of the ANT means using the signal level of the IM extraction means, and the intermodulation detection circuit is provided at a stage before the RF amplifier circuit controlled by the AGC. A receiver characterized by being inserted.
調検出回路の第二の周波数変換手段の局部発振周波数は
共通の局部発振器より供給される特許請求の範囲第１項
記載の受信機。(2) The receiver according to claim 1, wherein the local oscillation frequency of the first frequency conversion means and the local oscillation frequency of the second frequency conversion means of the intermodulation detection circuit are supplied from a common local oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62328114A JPH084236B2 (en) | 1987-12-24 | 1987-12-24 | Receiving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62328114A JPH084236B2 (en) | 1987-12-24 | 1987-12-24 | Receiving machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01170121A true JPH01170121A (en) | 1989-07-05 |
| JPH084236B2 JPH084236B2 (en) | 1996-01-17 |
Family
ID=18206647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62328114A Expired - Lifetime JPH084236B2 (en) | 1987-12-24 | 1987-12-24 | Receiving machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084236B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991019356A1 (en) * | 1990-06-01 | 1991-12-12 | Toyo Communication Equipment Co., Ltd. | Method of preventing suppression of sensitivity of a receiver and method of preventing radio interference |
| EP1394936A2 (en) * | 2002-08-27 | 2004-03-03 | Delphi Technologies, Inc. | Enhanced automatic gain control |
| KR20170073368A (en) * | 2015-12-18 | 2017-06-28 | (주)디오시스 | Therapy apparatus for diabetic foot ulcers using laser diode |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60160731A (en) * | 1984-02-01 | 1985-08-22 | Fujitsu Ten Ltd | Device for decreasing disturbance of intermodulation of receiver |
-
1987
- 1987-12-24 JP JP62328114A patent/JPH084236B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60160731A (en) * | 1984-02-01 | 1985-08-22 | Fujitsu Ten Ltd | Device for decreasing disturbance of intermodulation of receiver |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991019356A1 (en) * | 1990-06-01 | 1991-12-12 | Toyo Communication Equipment Co., Ltd. | Method of preventing suppression of sensitivity of a receiver and method of preventing radio interference |
| GB2250403A (en) * | 1990-06-01 | 1992-06-03 | Toyo Communication Equip | Method of preventing suppresion of sensitivity of a receiver and method of preventing radio interference |
| US5390345A (en) * | 1990-06-01 | 1995-02-14 | Nippon Telegraph And Telephone Corporation | Method for preventing desensitization and radio interference of radio receivers |
| GB2250403B (en) * | 1990-06-01 | 1995-03-29 | Toyo Communication Equip | Radio receivers which prevent desensitization and radio interference |
| EP1394936A2 (en) * | 2002-08-27 | 2004-03-03 | Delphi Technologies, Inc. | Enhanced automatic gain control |
| EP1394936A3 (en) * | 2002-08-27 | 2007-01-03 | Delphi Technologies, Inc. | Enhanced automatic gain control |
| KR20170073368A (en) * | 2015-12-18 | 2017-06-28 | (주)디오시스 | Therapy apparatus for diabetic foot ulcers using laser diode |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH084236B2 (en) | 1996-01-17 |
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