JPH01113407U - - Google Patents
Info
- Publication number
- JPH01113407U JPH01113407U JP1988006984U JP698488U JPH01113407U JP H01113407 U JPH01113407 U JP H01113407U JP 1988006984 U JP1988006984 U JP 1988006984U JP 698488 U JP698488 U JP 698488U JP H01113407 U JPH01113407 U JP H01113407U
- Authority
- JP
- Japan
- Prior art keywords
- positive feedback
- circuit
- amplifier circuit
- resonant
- feedback 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 101001077298 Homo sapiens Retinoblastoma-binding protein 5 Proteins 0.000 description 1
- 102100025192 Retinoblastoma-binding protein 5 Human genes 0.000 description 1
- 102100036550 WD repeat-containing protein 82 Human genes 0.000 description 1
- 101710093192 WD repeat-containing protein 82 Proteins 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
第１図はこの考案の一実施例の構成を示す回路
図、第２図はのバンド切換え機能付きの局部発振
回路の従来構成を示す回路図である。
Ｑ……発振トランジスタ、Ｒ１〜Ｒ８……抵抗
、Ｃ１〜Ｃ７……コンデンサ、Ｌ１〜Ｌ３……コ
イル、ＳＷＤ１，ＳＷＤ２……スイツチングダイ
オード、ＶＣＤ……可変容量ダイオード、Ｔ１〜
Ｔ３……端子。
FIG. 1 is a circuit diagram showing the structure of an embodiment of this invention, and FIG. 2 is a circuit diagram showing the conventional structure of a local oscillation circuit with a band switching function. Q...Oscillation transistor, R1 to R8 ...Resistor, C1 to C7 ...Capacitor, L1 to L3 ...Coil, SWD1 , SWD2 ...Switching diode, VCD...Variable capacitance diode , T 1 ~
T3 ...Terminal.
Claims (1)
正帰還増幅回路の正帰還ループに挿入されるＬＣ
共振回路と、 このＬＣ共振回路の上記複数のインダクタの組
合せを変えることにより、バンド単位で共振周波
数を切り換えるスイツチと、 このスイツチの周波数切換え動作に連動して上
記正帰還増幅回路のバイアス電流を切り換えるバ
イアス切換え回路とを具備したことを特徴とする
局部発振回路。[Claims for Utility Model Registration] A positive feedback amplifier circuit having a positive feedback loop, and an LC that is composed of a plurality of inductors and capacitors and inserted into the positive feedback loop of the positive feedback amplifier circuit.
A resonant circuit and a switch that switches the resonant frequency in each band by changing the combination of the plurality of inductors of this LC resonant circuit, and a bias current of the positive feedback amplifier circuit that is linked to the frequency switching operation of this switch. A local oscillation circuit characterized by comprising a bias switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988006984U JPH01113407U (en) | 1988-01-22 | 1988-01-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988006984U JPH01113407U (en) | 1988-01-22 | 1988-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01113407U true JPH01113407U (en) | 1989-07-31 |
Family
ID=31211612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988006984U Pending JPH01113407U (en) | 1988-01-22 | 1988-01-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01113407U (en) |
-
1988
- 1988-01-22 JP JP1988006984U patent/JPH01113407U/ja active Pending
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