JPS62250726A - Local oscillator - Google Patents
Local oscillatorInfo
- Publication number
- JPS62250726A JPS62250726A JP9571286A JP9571286A JPS62250726A JP S62250726 A JPS62250726 A JP S62250726A JP 9571286 A JP9571286 A JP 9571286A JP 9571286 A JP9571286 A JP 9571286A JP S62250726 A JPS62250726 A JP S62250726A
- Authority
- JP
- Japan
- Prior art keywords
- local oscillation
- section
- feedback signal
- temperature compensation
- signal
- 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 48
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野１
本発明は、受信装置における局部発振装置において、第
１局部発振部七第２局部発振部に共通の温度補償信号発
生部からの信号により温度補償し、かつ帰還信号と加算
器で加算した局部発振装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention provides a local oscillation device in a receiving device, in which the temperature is determined by a signal from a temperature compensation signal generator common to a first local oscillator and a second local oscillator. This invention relates to a local oscillator that is compensated and added with a feedback signal using an adder.
［従来の技術Ｊ
第１局部発振部と第２局部発振部を持つ受信装置におい
て、安定な受信状態を維持するためには、各局部発振部
を安定な周波数に維持する必要がある。第２図は、従来
の受信装置における局部発振装置の構造であり、第１局
部発振部と第２局部発掘部は、それぞれ独立して調整さ
れている。そして通常は、第１局部発振部が受信周波数
を選択するための可変周波数発撮器で、ＰＬＬを構成し
ている。しかし、各局部発振部の安定度を上げるとコス
トも高くなり、また調整の手間がかかる。[Prior Art J] In a receiving device having a first local oscillation section and a second local oscillation section, in order to maintain a stable reception state, it is necessary to maintain each local oscillation section at a stable frequency. FIG. 2 shows the structure of a local oscillation device in a conventional receiving device, and the first local oscillation section and the second local excavation section are each independently adjusted. Usually, the first local oscillator is a variable frequency oscillator for selecting a reception frequency, and constitutes a PLL. However, increasing the stability of each local oscillator increases the cost and requires more effort for adjustment.
そこで第１局部発振部に検波部から帰還信号を送り、目
的の周波数に零インさせるＡＦＣ回路が広く使用されて
いる。しかしシングルコンバージョンの場合はよいが、
ダブルコンバージョンの場合には、第２局部発振部の変
動をカバーすることが出来ない。そこで、第１局部発振
部と第２局部発振部の温度補償信号発生部を共通にする
ことが提案されている（実開昭６Ｏ−１２７０１５）。Therefore, an AFC circuit is widely used that sends a feedback signal from a detection section to a first local oscillation section to zero in on a target frequency. However, it is good for single conversion,
In the case of double conversion, fluctuations in the second local oscillator cannot be covered. Therefore, it has been proposed that the first local oscillation section and the second local oscillation section have a common temperature compensation signal generating section (Utility Model Publication No. 6O-127015).
第２図は第１局部発振器２０と第２局部発振器２１と２
つの発振器に温度補償信号発生部２２から補償信号を供
給している。しかし、第１局部発掘部に合わせて補償信
号を第２局部発掘部で使用すると第２局部発振部が過補
償になったり、補償不足になったりすることがある。ま
た、温度補償回路も第１局部発振部と第２局部発振部に
それぞれ持たなくてはならないので調整の手間が二重に
かかる欠点がある。FIG. 2 shows a first local oscillator 20 and a second local oscillator 21 and 2.
A compensation signal is supplied from the temperature compensation signal generator 22 to two oscillators. However, if a compensation signal is used in the second local excavation section in accordance with the first local excavation section, the second local oscillation section may become overcompensated or undercompensated. Further, since temperature compensation circuits must be provided in each of the first local oscillation section and the second local oscillation section, there is a drawback that the effort for adjustment is doubled.
［発明が解決しようとする問題点Ｊ
本発明では第１局部発振部と第２局部発振部に共通の温
度補償信号発生部を設け、この温度補償信号発生部と検
波部からの帰還信号を加算して補償信号として問題を解
決している。[Problem to be solved by the invention J In the present invention, a common temperature compensation signal generation section is provided for the first local oscillation section and the second local oscillation section, and the feedback signals from the temperature compensation signal generation section and the detection section are added. The problem is solved by using a compensation signal.
［本発明の構成Ｊ
本発明の構成は、受信装置に第１局部発振部と第２局部
発振部を持つ局部発振装置において、第１局部発振部と
第２局部発振部に温度補償信号発生部の信号を検波部か
らの帰還信号と加算器で加算して入力する局部発振装置
である。[Configuration of the present invention J The configuration of the present invention is that, in a local oscillation device having a first local oscillation section and a second local oscillation section in a receiving device, a temperature compensation signal generation section is provided in the first local oscillation section and the second local oscillation section. This is a local oscillation device that adds the signal from the detector with the feedback signal from the detection section using an adder and inputs the result.
［作用及び実施例Ｊ
第１図は、本発明の構成を示すブロックダイヤグラムで
ある。第１局部発振部１と第２局部発振部２かあり、其
々の信号は、第１混合部３と第２混合部４に送られ、周
波数変換をしている。従来は、第１局部発振部１と第２
局部発振部２をそれぞれ独立して、温度補償を行ってい
た。そこで本発明では第１局部発振部ｌと第２局部発振
部２で使用する水晶振動子のカットアングルを殆ど同じ
にして温度特性もほぼ一致させている。またここで使用
する第１局部発振部と第２局部発振部は可変周波数発振
器（ＶＣＸＯ）であり、２つの局部発掘部の電圧に対す
る周波数変化量がほぼ一致させている。これによって、
補償信号が制御し易くなる。この様な前提で本発明は第
１局部発掘部１と第２局部発振部２に共通の温度補償信
号発生部５を設けている。第１局部発掘部ｌで温度補償
する ′信号を第２局部発掘部２で使用することが
出来る様になる。そしてさらに目的信号の周波数に合わ
せるために、検波部６から帰還信号（ＡＦＣ）を取り出
し、この帰還信号を各局部発振部に帰還させる。この帰
還信号を温度補償信号発生部５からの信号と加算回路７
，８で加算する。この際、第１局部発振部ｌにそのまま
の信号を帰還して最適状態となった場合に、第２局酊発
振部２にそのままの信号を帰還すれば、過補償になるか
、補償不足となる不都合がある。そこで、温度補償信号
発生部５の出力と帰還信号を加算する前に帰還信号に係
数を掛ける係数乗算部９を接続している。この係数乗算
部９は帰還信号をＮ２／Ｎ、にしている。[Operation and Example J] FIG. 1 is a block diagram showing the configuration of the present invention. There are a first local oscillation section 1 and a second local oscillation section 2, and their signals are sent to a first mixing section 3 and a second mixing section 4 for frequency conversion. Conventionally, the first local oscillator 1 and the second local oscillator
Temperature compensation was performed for each local oscillation section 2 independently. Therefore, in the present invention, the cut angles of the crystal resonators used in the first local oscillation section 1 and the second local oscillation section 2 are almost the same, and the temperature characteristics are also made almost the same. Further, the first local oscillation section and the second local oscillation section used here are variable frequency oscillators (VCXOs), and the amount of frequency change with respect to the voltage of the two local excavation sections is made almost the same. by this,
The compensation signal becomes easier to control. Based on this premise, the present invention provides a common temperature compensation signal generation section 5 for the first local excavation section 1 and the second local oscillation section 2. The temperature-compensated signal from the first local excavation section 1 can now be used by the second local excavation section 2. Further, in order to match the frequency of the target signal, a feedback signal (AFC) is extracted from the detection section 6 and fed back to each local oscillation section. This feedback signal is combined with the signal from the temperature compensation signal generator 5 by the adder circuit 7.
, 8. At this time, if the signal as it is is fed back to the first local oscillator l and the optimum state is reached, if the signal is fed back as it is to the second local oscillator 2, it will result in over-compensation or under-compensation. There is a certain inconvenience. Therefore, before adding the output of the temperature compensation signal generating section 5 and the feedback signal, a coefficient multiplication section 9 is connected which multiplies the feedback signal by a coefficient. This coefficient multiplier 9 makes the feedback signal N2/N.
Ｎ、は、第１局部発振部ｌがＰＬＬで構成されており、
基準発振部の出力を分周した分周比であり、Ｎ２は第１
局部発掘部ｌのＰＬＬにおけるループ内の分局部の分周
比を表す。In N, the first local oscillator l is composed of a PLL,
N2 is the frequency division ratio obtained by dividing the output of the reference oscillator, and N2 is the first
It represents the frequency division ratio of the local part in the loop in the PLL of the local excavation part l.
本発明によって温度補償部は１つで済むためコストが低
下出来、しかも受信装置全体を安定な系となる。なお、
検波部６からの帰還信号は反転回路１０を通して帰還さ
せている。また第１混合部３と第２混合部４及び検波部
６の間では増幅機１１で増幅している。According to the present invention, since only one temperature compensator is required, costs can be reduced, and the entire receiving apparatus becomes a stable system. In addition,
A feedback signal from the detection section 6 is fed back through an inverting circuit 10. Furthermore, the signal is amplified by an amplifier 11 between the first mixing section 3, the second mixing section 4, and the detection section 6.
【本発明の効果Ｊ
本発明は、受信装置のローカル発振の安定度を個々の発
振器で安定化させたのではコストがかさむため、温度補
償信号発生部を１つにし、２つの発振器で兼用するとと
もに、発振部に帰還信号を伝達することによって、信号
に零インさせる様な機能を果たす。さらに、補償精度を
上げるために、一方の局部発振部ではＡＦＣ信号に補償
回路を設け、過補償、補償不足を調整している。[Effects of the present invention J] Since stabilizing the local oscillation of the receiving device using individual oscillators would increase costs, the present invention uses a single temperature compensation signal generating section and uses two oscillators. At the same time, by transmitting a feedback signal to the oscillation section, it performs a function of making the signal zero-in. Furthermore, in order to improve compensation accuracy, one local oscillation section is provided with a compensation circuit for the AFC signal to adjust for over-compensation and under-compensation.
以上により、安定な受信装置の局部発振部が実現出来、
調整か少ない回路を実現出来る。As a result of the above, a stable local oscillator of the receiving device can be realized.
A circuit with fewer adjustments can be realized.
本発明は、移動無線や自動車電話の車載用等基地局から
極めて安定な電波を受信する場合に盲動である。The present invention works blindly when receiving extremely stable radio waves from a base station for mobile radio or in-vehicle use of a car phone.
第１図は、本発明を説明するためのブロックダイヤグラ
ムであり、第２図は、２つの発振部に共通の温度補償信
号発生部を接続した従来例を示す。
Ｉ・・・・・・第１局部発振部、
２・・・・・・第２局部発振部、
５・・・・・・温度補償信号発生部、
６・・・・・・検波部、
７、訃・・・・・加算器、
９・・・・・・係数乗算回路
特許出願人 キンセキ株式会社
第１図FIG. 1 is a block diagram for explaining the present invention, and FIG. 2 shows a conventional example in which a common temperature compensation signal generation section is connected to two oscillation sections. I...First local oscillation section, 2...Second local oscillation section, 5...Temperature compensation signal generation section, 6...Detection section, 7 , Adder, 9... Coefficient multiplication circuit Patent applicant Kinseki Co., Ltd. Figure 1
Claims (2)
つ局部発振装置において、第１局部発振部と第２局部発
振部に温度補償信号発生部の信号を検波部からの帰還信
号と加算器で加算して入力したことを特徴とする局部発
振装置。(1) In a local oscillation device having a first local oscillation section and a second local oscillation section in the receiving device, the first local oscillation section and the second local oscillation section receive a signal from the temperature compensation signal generation section and a feedback signal from the detection section. A local oscillation device characterized in that the input signal is added by adding and inputting with an adder.
温度補償信号発生部と加算する際、該帰還信号に係数を
乗算する係数乗算回路を接続したことを特徴とする特許
請求の範囲第１項記載の局部発振装置。(2) A patent claim characterized in that a coefficient multiplication circuit that multiplies the feedback signal by a coefficient when adding the feedback signal from the detection unit to the temperature compensation signal generation unit is connected to the second local oscillation unit. The local oscillation device according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9571286A JPS62250726A (en) | 1986-04-23 | 1986-04-23 | Local oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9571286A JPS62250726A (en) | 1986-04-23 | 1986-04-23 | Local oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62250726A true JPS62250726A (en) | 1987-10-31 |
Family
ID=14145101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9571286A Pending JPS62250726A (en) | 1986-04-23 | 1986-04-23 | Local oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62250726A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0349431A (en) * | 1989-07-18 | 1991-03-04 | Nec Corp | Temperature characteristic compensating system for saw intermediate frequency filter |
-
1986
- 1986-04-23 JP JP9571286A patent/JPS62250726A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0349431A (en) * | 1989-07-18 | 1991-03-04 | Nec Corp | Temperature characteristic compensating system for saw intermediate frequency filter |
| JP2822461B2 (en) * | 1989-07-18 | 1998-11-11 | 日本電気株式会社 | Temperature characteristic compensation method for SAW intermediate frequency filter |
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