JPS63102366U - - Google Patents
Info
- Publication number
- JPS63102366U JPS63102366U JP19600186U JP19600186U JPS63102366U JP S63102366 U JPS63102366 U JP S63102366U JP 19600186 U JP19600186 U JP 19600186U JP 19600186 U JP19600186 U JP 19600186U JP S63102366 U JPS63102366 U JP S63102366U
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- circuit
- luminance signal
- sync chip
- terminal
- 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
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000009795 derivation Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
Description
第1図はこの考案の一実施例を示す回路図、第
2図は第1図の回路の出力信号の例を示す図、第
3図はこの考案の他の実施例を示す回路図、第4
図は従来のシンクチツプクランプ回路を示す図、
第5図は第4図の回路の出力信号の例を示す図で
ある。
Q11,Q12,Q21〜Q24…トランジス
タ、C11…コンデンサ、i11,i12…電流
源、22…電流検出回路。
FIG. 1 is a circuit diagram showing one embodiment of this invention, FIG. 2 is a diagram showing an example of an output signal of the circuit of FIG. 1, and FIG. 3 is a circuit diagram showing another embodiment of this invention. 4
The figure shows a conventional sink chip clamp circuit.
FIG. 5 is a diagram showing an example of an output signal of the circuit of FIG. 4. Q11, Q12, Q21 to Q24...Transistor, C11...Capacitor, i11, i12...Current source, 22...Current detection circuit.
Claims (1)
、このコンデンサの他方の端子に接続され、前記
コンデンサに輝度信号のシンクチツプが入力した
ときのみオンして前記コンデンサを充電するクラ
ンプ用スイツチ回路と、同じく前記コンデンサの
他方の端子に接続され輝度信号を導出する導出回
路とを具備したシンクチツプクランプ回路におい
て、 前記シンクチツプ期間に前記クランプ用スイツ
チ回路に流れる電流を検出してこの電流に依存し
た量だけ、前記導出回路の直流レベルを前記シン
クチツプ期間において低下さる補償手段を設け、
次のシンクチツプが到来するまでに前記コンデン
サの放電がすすむことによる前記導出回路の出力
直流レベルの変化を補償することを特徴とするシ
ンクチツプクランプ回路。[Claims for Utility Model Registration] A capacitor to which a luminance signal is supplied to one terminal, and a capacitor connected to the other terminal of the capacitor, which turns on and charges the capacitor only when a luminance signal sync chip is input to the capacitor. In the sync chip clamp circuit, the current flowing through the clamp switch circuit during the sync chip period is detected, and the circuit includes a clamp switch circuit that outputs a luminance signal, and a derivation circuit that is also connected to the other terminal of the capacitor and derives a luminance signal. providing compensation means for reducing the DC level of the deriving circuit during the sink chip period by an amount that depends on this current;
A sync chip clamp circuit comprising: compensating for a change in the output DC level of the deriving circuit due to progress of discharge of the capacitor until the next sync chip arrives.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19600186U JPS63102366U (en) | 1986-12-20 | 1986-12-20 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19600186U JPS63102366U (en) | 1986-12-20 | 1986-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63102366U true JPS63102366U (en) | 1988-07-04 |
Family
ID=31154410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19600186U Pending JPS63102366U (en) | 1986-12-20 | 1986-12-20 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63102366U (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57152779A (en) * | 1981-03-18 | 1982-09-21 | Toshiba Corp | Synchronous signal clamping circuit for video signal |
-
1986
- 1986-12-20 JP JP19600186U patent/JPS63102366U/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57152779A (en) * | 1981-03-18 | 1982-09-21 | Toshiba Corp | Synchronous signal clamping circuit for video signal |
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