JPS6337719A - Multiband oscillation circuit - Google Patents
Multiband oscillation circuitInfo
- Publication number
- JPS6337719A JPS6337719A JP61180729A JP18072986A JPS6337719A JP S6337719 A JPS6337719 A JP S6337719A JP 61180729 A JP61180729 A JP 61180729A JP 18072986 A JP18072986 A JP 18072986A JP S6337719 A JPS6337719 A JP S6337719A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- oscillation
- signal
- terminal
- 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
- 230000010355 oscillation Effects 0.000 title claims abstract description 61
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001399426 Myas Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、チューナの発振回路に係わり、特に複数バン
ドを一つの発振回路で発振可能にした多バンド発振回路
に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oscillation circuit for a tuner, and more particularly to a multi-band oscillation circuit in which a single oscillation circuit can oscillate multiple bands.
〈発明の概要〉
本発明は多バンドチューナの発振回路において、発振用
トランジスタのコレクタ、エミッタ間に接続されたコン
デンサ及びヘース、コレクタ間に接続されたインダクタ
ンスを帯域間で切換え、可変容量ダイオードを複数の帯
域に共通とする事により、発振回路の部品点数を削減し
、部品の組付スペースを小とする事により、チューナを
小型化する様にしたものである。<Summary of the Invention> The present invention provides an oscillation circuit for a multi-band tuner in which a capacitor and a heath connected between the collector and emitter of an oscillation transistor, and an inductance connected between the collectors are switched between bands, and a plurality of variable capacitance diodes are connected. By making the frequency band common, the number of parts in the oscillation circuit is reduced, and the space for assembling the parts is reduced, thereby making the tuner more compact.
〈従来の技術〉
第4図は従来のVHF帯及びU HF帯を受信するスー
パーヘテロダイン方式チューナのブロック図を示す。■
及び2はUHF及びVHF帯の入力端子を示す。3は入
力同調回路、4はRF増巾回路(高周波増巾回路)、5
は複同調回路、6は発振器及び7はミキサ回路で、夫々
UHF帯を受信する回路である。<Prior Art> FIG. 4 shows a block diagram of a conventional superheterodyne tuner that receives VHF and UHF bands. ■
and 2 indicate input terminals for UHF and VHF bands. 3 is an input tuning circuit, 4 is an RF amplification circuit (high frequency amplification circuit), 5
numeral 6 is an oscillator circuit, and numeral 7 is a mixer circuit, each of which receives the UHF band.
8は入力フィルタ回路、9は入力単同調回路、10はR
F増中回路、11は複同調回路、12は発振器及び13
はミキサ回路で夫々VHF帯を受信する回路である。8 is an input filter circuit, 9 is an input single tuning circuit, 10 is R
F increasing circuit, 11 is a double tuning circuit, 12 is an oscillator, and 13
are mixer circuits that receive the VHF band.
14はミキサ回路13からのIF信号出力端子である。14 is an IF signal output terminal from the mixer circuit 13.
15はVHF帯及びUHF帯(以下単にU・■という)
切換回路である。15 is VHF band and UHF band (hereinafter simply referred to as U・■)
It is a switching circuit.
VHF帯の信号を受信する場合は複同調回路11からの
信号と発振器12との発振周波数をミキサ回路13で混
入し、その出力は58.75 MllzのIF倍信号し
て端子14から出力される。When receiving a VHF band signal, the signal from the double tuning circuit 11 and the oscillation frequency of the oscillator 12 are mixed in the mixer circuit 13, and the output is outputted from the terminal 14 as an IF multiplied signal of 58.75 Mllz. .
他方UHF帯を受信する場合は、複同調回路5からの選
択信号と、発振器6からの発振周波数信号とをミキサ回
路7で混合し、この混合出力であるIF倍信号56.7
5 MHz )はU・■切換回路15を介してミキサ回
路13で増巾された後、端子14へ出力される。U・■
切換回路15はUHF受信時のみUHFミキサからのI
F倍信号VHFミキサ13へ供給する様にオンとされる
。On the other hand, when receiving the UHF band, the selection signal from the double tuning circuit 5 and the oscillation frequency signal from the oscillator 6 are mixed in the mixer circuit 7, and the mixed output is an IF multiplied signal 56.7
5 MHz) is amplified by the mixer circuit 13 via the U/■ switching circuit 15 and then output to the terminal 14. U・■
The switching circuit 15 switches the I from the UHF mixer only when receiving UHF.
It is turned on so as to supply the F-fold signal to the VHF mixer 13.
〈発明が解決しようとする問題点〉
上記従来例の発振回路ではU・■に夫々専用の発振回路
6.12を構成した後、発振用トランジスタ、可変容量
ダイオード等、夫々の発振回路に必要とし重複する為、
多くの部品点数を必要とするという問題がある。<Problems to be Solved by the Invention> In the conventional oscillation circuit described above, after configuring dedicated oscillation circuits 6 and 12 for U and Due to duplication,
There is a problem that a large number of parts are required.
又、チューナケース内への発振回路の組付はU・■の再
発振回路を組付けるスペースを必要とする為、チューナ
が大形になるという問題がある。Furthermore, since the assembly of the oscillation circuit into the tuner case requires space for the assembly of the U and ■ re-oscillation circuits, there is a problem that the tuner becomes large.
又部品点数が多い為、コストアンプになるという問題も
ある。Furthermore, since there are a large number of parts, there is also the problem that the amplifier becomes costly.
本発明は係る従来の種々の問題点を解決する事を目的と
する。The present invention aims to solve the various problems of the related art.
く問題点を解決する為の手段〉
本発明になる多バンド発振回路は、発振用トランジスタ
のコレクタ、エミッタ間に接続されたコンデンサ及びベ
ース、コレクタ間に接続されたインダクタンスを帯域間
で切換え、可変容量ダイオード及び発トランジスタ等を
複数の帯域に共通とする構成を有する。Means for Solving the Problems〉 The multi-band oscillation circuit according to the present invention switches between bands the capacitor connected between the collector and emitter of the oscillation transistor, and the inductance connected between the base and collector. It has a configuration in which capacitor diodes, generator transistors, etc. are common to multiple bands.
〈実施例〉
第1図は本発明の一実施例になる発振回路を含む多バン
ドチューナの回路ブロック図を示す。第4図と同一構成
部分には同一符号を付し、その説明は省略する。<Embodiment> FIG. 1 shows a circuit block diagram of a multi-band tuner including an oscillation circuit according to an embodiment of the present invention. Components that are the same as those in FIG. 4 are given the same reference numerals, and their explanations will be omitted.
16は入力フィルタ、17はVHF単同調回路、18は
UHF単同調回路19はVHF、UHF共用(以下単に
U・■共用という)RF増巾回路(高周波項中回路)、
20はVHF複同調回路、21はUHF複同調回路、2
2はU・■共用発振器、23はU・■共用ミキサ回路を
夫々示す。16 is an input filter; 17 is a VHF single tuning circuit; 18 is a UHF single tuning circuit;
20 is a VHF double tuning circuit, 21 is a UHF double tuning circuit, 2
2 represents a U/■ shared oscillator, and 23 represents a U/■ shared mixer circuit.
C1はU−V共用の同調回路17及び18の同調用可変
コンデンサである。C,、C,はU・■共用の複同調回
路20.21の可変コンデンサである。C1 is a variable capacitor for tuning of the tuning circuits 17 and 18 for both UV and UV. C, , C, are variable capacitors of the dual tuning circuit 20 and 21 shared by U and ■.
VHF帯の受信時について説明する。端子2へ入来した
信号は入力フィルタでVHF帯の信号のみが通過し、V
HF単同調回路17で所望の局の周波数に選択同調され
、RF増巾回路19で所定レベルに増巾された後、複同
調回路2oで所定の選択度特性が付与され、ミキサ回路
23へ供給され、22で発振器22からの周波数とで周
波数変換され、周波数変換されたIF出力信号は端子1
4へ出力される。The reception of VHF band will be explained. The signal entering terminal 2 is filtered through an input filter, allowing only VHF band signals to pass through.
After being selectively tuned to the frequency of a desired station in the HF single tuning circuit 17 and amplified to a predetermined level in the RF amplification circuit 19, it is given a predetermined selectivity characteristic in the double tuning circuit 2o and is supplied to the mixer circuit 23. is frequency-converted with the frequency from the oscillator 22 at 22, and the frequency-converted IF output signal is sent to terminal 1.
Output to 4.
次に、UHF信号の受信について説明する。端子1に入
来した信号は単同調回路18へ供給され、所望の局の周
波数に選択同調された後、RF増巾回路19を介してU
HF複同調回路21へ供給されて所定の選択度特性が付
与され、後続の回路へ供給される。ミキサ回路23で前
記と同様に周波数変換され、IF倍信号して端子14へ
出力される。Next, reception of the UHF signal will be explained. The signal entering the terminal 1 is supplied to the single tuning circuit 18, selectively tuned to the frequency of the desired station, and then sent to the U via the RF amplification circuit 19.
The signal is supplied to the HF double tuning circuit 21, given a predetermined selectivity characteristic, and then supplied to the subsequent circuit. The mixer circuit 23 performs frequency conversion in the same manner as described above, and outputs the IF multiplied signal to the terminal 14.
この様に入力同調回路24.25段間同調回路26.2
7及び詳細は後述する発振器22において可変容量素子
をU・Vで共用としている為、部品点数を消滅でき、又
チューナ自体を小形化する事ができる。In this way, input tuning circuit 24.25 inter-stage tuning circuit 26.2
7 and in the oscillator 22, which will be described in detail later, the variable capacitance element is shared by U and V, so the number of components can be eliminated and the tuner itself can be made smaller.
次に第1図の具体的な回路図を第2図に示す。Next, a specific circuit diagram of FIG. 1 is shown in FIG. 2.
尚、第2図中、発振回路22以外は本発明の実施例に無
関係なので、その説明は省略する。It should be noted that in FIG. 2, the components other than the oscillation circuit 22 are irrelevant to the embodiment of the present invention, so their explanation will be omitted.
発振回路22は、コルビッツ型の発振回路で、C2は発
振用のトランジスタ、C2Q、 C:l◎がトランジ
スタQ、のコレクタ・エミッタ間に接続されるコンデン
サ、Cal及びC34はベース・エミッタ間に接続され
るコンデンサ、L !l L za及びL!5はベー
ス・コレクタ間に選択的に接続されるコイル及びインダ
クタ、C3’lはコレクタを交流的アースする為のコン
デンサ、LL&は調整用のインダクタ、LZ’?は発振
安定用のインダクタ、D V a及びDV、は発振周波
数可変用及びAFC用の可変容量ダイオードを夫々示す
。DI、、D、、はVH端子から電圧が供給されるU・
■切換用のダイオードで、VHF帯受信時にオンとなる
。DI?はV HF帯受信時において、ロー及びハイバ
ンドの切換用のダイオードである。The oscillation circuit 22 is a Kolbitz type oscillation circuit, C2 is a transistor for oscillation, C2Q, C:l◎ is a capacitor connected between the collector and emitter of transistor Q, and Cal and C34 are connected between the base and emitter. capacitor, L! l L za and L! 5 is a coil and inductor selectively connected between the base and collector, C3'l is a capacitor for AC grounding the collector, LL& is an inductor for adjustment, and LZ'? denotes an inductor for stabilizing oscillation, and D V a and DV denote variable capacitance diodes for varying the oscillation frequency and for AFC, respectively. DI,,D,, are U・to which voltage is supplied from the VH terminal.
■A switching diode that turns on when receiving VHF band. DI? is a diode for switching between low and high bands when receiving VHF band.
VHF帯の発振動作について説明する。ローバンド発振
時にはVL端子からダイオードD4を介してダイオード
D、、、D、、に電圧が印加されてこれらはオンとなる
。するとコレクタ・エミッタ間のコンデンサCつ、の容
量に対してC1゜の容量が、付加される。又、ベース・
エミッタ間の容量はコンデンサC31とC34の直列容
量となる。そしてベース・コレクタ間には交流的にコイ
ルL2:1. L24が接続される。この様な回路構
成でローバンドの発振が行われ、発振周波数の可変はV
T端子からの可変電圧が可変容量ダイオードDV4に印
加される事によってなされる。The oscillation operation in the VHF band will be explained. During low band oscillation, a voltage is applied from the VL terminal to the diodes D, . . . , D, through the diode D4, and these are turned on. Then, a capacitance of C1° is added to the capacitance of the C collector-emitter capacitors. Also, the base
The emitter-to-emitter capacitance is the series capacitance of capacitors C31 and C34. And between the base and the collector there is an AC coil L2:1. L24 is connected. Low-band oscillation is performed with this circuit configuration, and the oscillation frequency can be varied by V.
This is done by applying a variable voltage from the T terminal to the variable capacitance diode DV4.
VHF帯のハイバンドにおける発振動作においてローバ
ンド発振時と異なる点は、ダイオードDISI DI
6に供給される切換電圧は、端子VHからダイオードD
、を介して行われる点、そして、ダイオードDI7をオ
ンにする電圧が、端子VHから供給される点である。コ
イルLzaはダイオードDl?により短絡される為、発
振用のコイルはLZ3のみとなる。尚Lt4のインダク
タンス成分はVHF帯に対しては非常に小さく無視でき
る。The difference in oscillation operation in the high band of the VHF band from that in low band oscillation is that the diode DISI DI
The switching voltage supplied to 6 is connected from terminal VH to diode D
, and that the voltage that turns on the diode DI7 is supplied from the terminal VH. Is the coil Lza the diode Dl? Since it is short-circuited, the oscillation coil is only LZ3. Note that the inductance component of Lt4 is very small and can be ignored for the VHF band.
次にUHF帯の発振動作について説明する。ダイオード
D Is−’−= D +7に対する切換電圧の供給は
なくなるので、これらはオフとなる。すると、コレクタ
・エミッタ間容量はCZ?のみとなり、ベース・エミッ
タ間の容量はCzs* 034にオフ状態のダイオー
ドDI6の端子間容1i(IPF程度)が直列接続とな
り、更にダイオードDI&にCIO並列接続され、これ
らの合成容量はPF以下の小容量となる。又、ベース・
コレクタ間に接続されるインダクタンス成分はインダク
タ[)zsとなる。この様な構成において、発振周波数
の可変は可変容量ダイオードDV4の容量可変により行
われる。Next, the oscillation operation in the UHF band will be explained. There is no switching voltage supply for the diodes D Is-'-=D +7, so they are turned off. Then, the collector-emitter capacitance is CZ? The capacitance between the base and emitter is Czs* 034 is connected in series with the terminal capacitance 1i (approximately IPF) of diode DI6 in the off state, and CIO is connected in parallel with diode DI&, and their combined capacitance is less than PF. It has a small capacity. Also, the base
The inductance component connected between the collectors is an inductor [)zs. In such a configuration, the oscillation frequency is varied by varying the capacitance of the variable capacitance diode DV4.
尚UHF帯の発振時において、コイルLffi3+L2
4はダイオードDIlkがオフであり、UHF帯に対し
てはインピーダンスが非常に大きい為、影響はない。Furthermore, during UHF band oscillation, coil Lffi3+L2
4, the diode DIlk is off and the impedance is very large for the UHF band, so there is no effect.
U・■の発振出力は結合コンデンサCn&を介して次段
のミキサ回路23へ供給される。The oscillation outputs of U and ■ are supplied to the next stage mixer circuit 23 via the coupling capacitor Cn&.
尚、コンデンサC3mは直流カット用のものである。ト
ランジスタQtへの電源電圧は端子Bから常に供給され
る。Note that the capacitor C3m is for DC cut. Power supply voltage to transistor Qt is always supplied from terminal B.
上述した様に発振回路22は、ダイオードDis。As described above, the oscillation circuit 22 includes a diode Dis.
[)+1.のオンオフによって発振トランジスタのコレ
クタ・エミッタ及びベース・エミッタ用のコンデンサを
切換、又コレクタ・ベース間のインダクタンスを切換え
る構成とした為、簡易な構成でU・■の発振を切換えら
れ、又発振素子を兼用でき、部品点数及び部品の組付ス
ペースを削減できる等の利点を有する。[)+1. The configuration is such that the collector-emitter and base-emitter capacitors of the oscillation transistor are switched by turning on and off, and the inductance between the collector and base is also switched, so the oscillation of U and ■ can be switched with a simple configuration, and the oscillation element can be switched. It has the advantage of being able to be used for both purposes, reducing the number of parts and the space required to assemble the parts.
第3図は上記発振回路22の変形例を示す。第2図と同
一部分には同一符号を付しその説明は省略する。第3図
の発振回路は符号22′で示す。第2図の発振回路と異
なる点は、発振出力の取出しの所であり、VHF等の発
振出力はコイルLZ3に誘導結合したコイル28から取
出される(出力端子29)。又UHF等の発振出力はイ
ンダクタLzsに誘導結合したインダクタL2Qによっ
て取出される(出力端子30)。FIG. 3 shows a modification of the oscillation circuit 22. In FIG. Components that are the same as those in FIG. 2 are given the same reference numerals, and their explanations will be omitted. The oscillator circuit of FIG. 3 is designated by the reference numeral 22'. The difference from the oscillation circuit shown in FIG. 2 is that the oscillation output is taken out, and the oscillation output such as VHF is taken out from the coil 28 which is inductively coupled to the coil LZ3 (output terminal 29). Further, an oscillation output such as UHF is taken out by an inductor L2Q inductively coupled to the inductor Lzs (output terminal 30).
この様にU・■別々に誘導結合によって発振出力を取出
す方法は、この発振回路の次段に接続されるミキサ回路
23における特に温度特性等の変化によるインピーダン
ス等の変化の影響を発振回路2γが受けC;<く、これ
により、発振周波数が安定であるという利点がある。In this way, the method of extracting the oscillation output by inductive coupling separately for U and ■ is such that the oscillation circuit 2γ is able to absorb the effects of changes in impedance, etc. due to changes in temperature characteristics, etc., in the mixer circuit 23 connected to the next stage of this oscillation circuit. This has the advantage that the oscillation frequency is stable.
〈発明の効果〉
上述した本発明になる多バンド発振回路は、発振トラン
ジスタQ22発振周波数可変用の可変容量ダイオードD
V4.AFC用の可変容量ダイオードDVS、コルビッ
ツ発振回路を構成する為のコンデンサCzq* C31
1C34+ C371及び、マイアス用抵抗R,,R
,等の各素子はVHF帯及びUHF帯の発振時に全て共
用されており、この点において部品点数の大巾な削減が
達成されている。<Effects of the Invention> The multi-band oscillation circuit according to the present invention described above includes the oscillation transistor Q22 and the variable capacitance diode D for varying the oscillation frequency.
V4. Variable capacitance diode DVS for AFC, capacitor Czq* C31 for configuring the Corvitz oscillation circuit
1C34+ C371 and resistances for myas R,,R
, etc. are all used in common during oscillation in the VHF band and UHF band, and in this respect, a significant reduction in the number of parts has been achieved.
又この事により、大巾なチューナのコスト低減を計って
いる。This also helps reduce the cost of the large tuner.
又部品点数の大巾な削減と相まって、U−Vの発振回路
を従来の様に別々に組付ける必要がなく、−ケ所にまと
めて組付る事ができる為、部品の組付はスペースを大巾
に低減でき、小形のチューナを実現する事ができる。In addition, coupled with the drastic reduction in the number of parts, there is no need to assemble the UV oscillation circuit separately as in the past, and it can be assembled in one place, saving space when assembling parts. The width can be reduced to a large extent, making it possible to realize a compact tuner.
第1図は本発明の一実施例になる発振回路が適用される
多バンドチューナの回路ブロック図、第2図は本発明の
一実施例になる発振回路を含む第1図のブロック図の具
体的な回路図、第3図は第2図の発振回路の変形例にな
る回路図、第4図は従来例になる多バンドチューナの回
路ブロック図を夫々示す。
22・・・発振回路、Q2・・・発振用トランジスタ、
D V 4・・・発振周波数可変用容量ダイオード、D
V、・・・AFC用可変可変容量ダイオードIS〜1)
tt・・・スイッチング用ダイオード、L23+ L
24・・・コイル、Lzs〜L2?・・・インダクタ、
C29〜C3B・・・コンデンサ。FIG. 1 is a circuit block diagram of a multi-band tuner to which an oscillation circuit according to an embodiment of the present invention is applied, and FIG. 2 is a concrete block diagram of the block diagram of FIG. 1 including an oscillation circuit according to an embodiment of the present invention. 3 is a circuit diagram of a modification of the oscillation circuit of FIG. 2, and FIG. 4 is a circuit block diagram of a conventional multiband tuner. 22...Oscillation circuit, Q2...Oscillation transistor,
D V 4...Capacitance diode for variable oscillation frequency, D
V,...AFC variable capacitance diode IS~1)
tt...Switching diode, L23+L
24...Coil, Lzs~L2? ...inductor,
C29~C3B...Capacitor.
Claims (1)
ビッツ型の発振回路において、 発振トランジスタのコレクタ、エミッタ間に交流的に接
続されたコンデンサ及び第1のスイッチインタダイオー
ドと、 該発振トランジスタのベースとコレクタ問に交流的に接
続されたコイル及び第2のスイッチングダイオードと、 該発振トランジスタのベースとコレクタ間に交流的に接
続された共振線路及び可変容量ダイオードとからなり、 該第1の帯域受信時には該第1及び第2のスイッチング
ダイオードが閉成され、該第2の帯域受信時にはこれら
第1及び第2のダイオードが開成される様にされた構成
の多バンド発振回路。[Claims] A Kolbitz type oscillator circuit for a multi-band tuner receiving first and second bands, comprising: a capacitor and a first switch interdiode connected in alternating current between the collector and emitter of an oscillation transistor; , a coil and a second switching diode connected in alternating current between the base and collector of the oscillation transistor, and a resonant line and a variable capacitance diode connected in alternating current between the base and collector of the oscillation transistor, A multiband oscillator circuit configured such that the first and second switching diodes are closed when receiving the first band, and the first and second switching diodes are opened when receiving the second band. .
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61180729A JPH07120966B2 (en) | 1986-07-31 | 1986-07-31 | Multi-band oscillator circuit |
KR1019870008077A KR910001371B1 (en) | 1986-07-31 | 1987-07-24 | Multi-band oscillator circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61180729A JPH07120966B2 (en) | 1986-07-31 | 1986-07-31 | Multi-band oscillator circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6337719A true JPS6337719A (en) | 1988-02-18 |
JPH07120966B2 JPH07120966B2 (en) | 1995-12-20 |
Family
ID=16088282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61180729A Expired - Lifetime JPH07120966B2 (en) | 1986-07-31 | 1986-07-31 | Multi-band oscillator circuit |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPH07120966B2 (en) |
KR (1) | KR910001371B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100434855B1 (en) * | 2002-07-24 | 2004-06-07 | 엘지이노텍 주식회사 | Vhf voltage control oscillation circuit and tuner capable of receiving two band using the same |
-
1986
- 1986-07-31 JP JP61180729A patent/JPH07120966B2/en not_active Expired - Lifetime
-
1987
- 1987-07-24 KR KR1019870008077A patent/KR910001371B1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100434855B1 (en) * | 2002-07-24 | 2004-06-07 | 엘지이노텍 주식회사 | Vhf voltage control oscillation circuit and tuner capable of receiving two band using the same |
Also Published As
Publication number | Publication date |
---|---|
KR910001371B1 (en) | 1991-03-04 |
KR880002317A (en) | 1988-04-30 |
JPH07120966B2 (en) | 1995-12-20 |
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