JPH0338969U - - Google Patents
Info
- Publication number
- JPH0338969U JPH0338969U JP9787789U JP9787789U JPH0338969U JP H0338969 U JPH0338969 U JP H0338969U JP 9787789 U JP9787789 U JP 9787789U JP 9787789 U JP9787789 U JP 9787789U JP H0338969 U JPH0338969 U JP H0338969U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- current
- emitter
- circuit
- average value
- 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 4
- 238000007599 discharging Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Picture Signal Circuits (AREA)
- Manipulation Of Pulses (AREA)
Description
第１図は本考案のクランプ回路の一実施例を示
した回路図、第２図は従来のクランプ回路の一例
を示した回路図、第３図は被クランプビデオ信号
の波形とクランプ後のビデオ信号の波形を示した
図である。
２……クランプ用コンデンサ、４……電圧源、
５，９……トランジスタ、６，７……抵抗、８…
…コンデンサ。
Fig. 1 is a circuit diagram showing an embodiment of the clamp circuit of the present invention, Fig. 2 is a circuit diagram showing an example of a conventional clamp circuit, and Fig. 3 shows the waveform of the video signal to be clamped and the video after clamping. FIG. 3 is a diagram showing the waveform of a signal. 2... Clamp capacitor, 4... Voltage source,
5, 9...Transistor, 6,7...Resistor, 8...
...capacitor.
Claims (1)
のエミツタにクランプ用コンデンサを介して被ク
ランプ信号が入力され、更にこのエミツタに前記
クランプ用コンデンサの電荷を放電させるための
抵抗が接続されて成るクランプ回路において、前
記トランジスタのコレクタ電流の平均値をとる積
分回路と、この積分回路によつてとられた前記平
均値に対して比例的関係にある電流を発生して、
この電流を前記トランジスタのエミツタに供給す
る電流供給回路とを具備したことを特徴とするク
ランプ回路。 In a clamp circuit, a voltage source is connected to the base of a transistor, a clamped signal is input to the emitter of the transistor via a clamping capacitor, and a resistor is further connected to the emitter for discharging the charge of the clamping capacitor. , an integrating circuit that takes the average value of the collector current of the transistor, and generating a current that is proportional to the average value taken by the integrating circuit,
A clamp circuit comprising: a current supply circuit that supplies this current to the emitter of the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9787789U JPH0338969U (en) | 1989-08-24 | 1989-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9787789U JPH0338969U (en) | 1989-08-24 | 1989-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0338969U true JPH0338969U (en) | 1991-04-15 |
Family
ID=31647002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9787789U Pending JPH0338969U (en) | 1989-08-24 | 1989-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338969U (en) |
-
1989
- 1989-08-24 JP JP9787789U patent/JPH0338969U/ja active Pending