JPH0398528U - - Google Patents
Info
- Publication number
- JPH0398528U JPH0398528U JP737990U JP737990U JPH0398528U JP H0398528 U JPH0398528 U JP H0398528U JP 737990 U JP737990 U JP 737990U JP 737990 U JP737990 U JP 737990U JP H0398528 U JPH0398528 U JP H0398528U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- variable capacitance
- capacitance diode
- tuning circuit
- input tuning
- 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
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 1
Description
第１図はこの考案の一実施例による入力同調回
路の構成を示す回路図、第２図は同実施例の等価
回路図、第３図は従来の入力同調回路の回路図、
第４図は第３図の入力同調回路の等価回路図であ
る。
１７，２２……可変容量ダイオード、１，２，
３，８，１０……コイル、５，６，７，１２，２
３……コンデンサ、４，９……スイツチダイオー
ド、１１，１３，１４，１５，１６，２１，２４
……抵抗、１００ａ……入力同調回路、１８……
入力端、１９，２０……選択端子。
FIG. 1 is a circuit diagram showing the configuration of an input tuning circuit according to an embodiment of this invention, FIG. 2 is an equivalent circuit diagram of the same embodiment, and FIG. 3 is a circuit diagram of a conventional input tuning circuit.
FIG. 4 is an equivalent circuit diagram of the input tuning circuit of FIG. 3. 17, 22...variable capacitance diode, 1, 2,
3, 8, 10...Coil, 5, 6, 7, 12, 2
3... Capacitor, 4, 9... Switch diode, 11, 13, 14, 15, 16, 21, 24
...Resistor, 100a...Input tuning circuit, 18...
Input terminal, 19, 20... selection terminal.
Claims (1)
ードを備えると共に、少なくとも容量およびイン
ダクタンスを直列接続した直列共振回路を信号線
路と接地間に備え、かつ、これらの容量あるいは
インダクタンスの一部をバンド切換に応じて有効
化あるいは無効化するスイツチ手段を備えてなる
入力同調回路において、 前記直列共振回路を構成する容量の少なくとも
一部を第２の可変容量ダイオードで構成し、この
第２の可変容量ダイオードの一方の電極に前記選
局電圧を加え、他方の電極にバイアス電圧を加え
たことを特徴とする入力同調回路。 (2) 前記第２の可変容量ダイオードは、前記選
局電圧と前記バイアス電圧とによつて、各受信バ
ンドの周波数低域において順方向にバイアスされ
、かつ、周波数高域において逆方向にバイアスさ
れることを特徴とする請求項第１記載の入力同調
回路。 (3) 前記バイアス電圧は、前記バンド切換電圧
を分圧したものであることを特徴とする請求項第
１または第２記載の入力同調回路。[Claims for Utility Model Registration] (1) A variable capacitance diode to which a tuning control voltage is applied is provided, and a series resonant circuit in which at least a capacitance and an inductance are connected in series is provided between a signal line and ground; In an input tuning circuit comprising a switch means for enabling or disabling part of the capacitance or inductance in response to band switching, at least part of the capacitance constituting the series resonant circuit is composed of a second variable capacitance diode. An input tuning circuit characterized in that the tuning voltage is applied to one electrode of the second variable capacitance diode, and a bias voltage is applied to the other electrode. (2) The second variable capacitance diode is forward biased in the low frequency range of each reception band and reverse biased in the high frequency range by the channel selection voltage and the bias voltage. The input tuning circuit according to claim 1, characterized in that: (3) The input tuning circuit according to claim 1 or 2, wherein the bias voltage is a voltage obtained by dividing the band switching voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP737990U JPH0398528U (en) | 1990-01-29 | 1990-01-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP737990U JPH0398528U (en) | 1990-01-29 | 1990-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0398528U true JPH0398528U (en) | 1991-10-14 |
Family
ID=31511034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP737990U Pending JPH0398528U (en) | 1990-01-29 | 1990-01-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0398528U (en) |
-
1990
- 1990-01-29 JP JP737990U patent/JPH0398528U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0398528U (en) | ||
| JPH07105665B2 (en) | amplifier | |
| JPH09261111A (en) | Rf switch and rf signal selector | |
| JPH0134442Y2 (en) | ||
| JPS6216025Y2 (en) | ||
| JPH0210674Y2 (en) | ||
| JPS6236363Y2 (en) | ||
| JPH066619Y2 (en) | Input tuning circuit | |
| JPS61206335U (en) | ||
| JPH0136357Y2 (en) | ||
| JPS6133722Y2 (en) | ||
| JPH02111924U (en) | ||
| JPS61184318U (en) | ||
| JPS6190327U (en) | ||
| JPH0436336U (en) | ||
| JPS61113438U (en) | ||
| JPS6361824U (en) | ||
| JPS6344509U (en) | ||
| JPS6170448U (en) | ||
| JPS63131237U (en) | ||
| JPS6416745U (en) | ||
| JPH0288339U (en) | ||
| JPH0221821U (en) | ||
| JPH02100341U (en) | ||
| JPS63178971U (en) |