JPH01177611U - - Google Patents
Info
- Publication number
- JPH01177611U JPH01177611U JP7340788U JP7340788U JPH01177611U JP H01177611 U JPH01177611 U JP H01177611U JP 7340788 U JP7340788 U JP 7340788U JP 7340788 U JP7340788 U JP 7340788U JP H01177611 U JPH01177611 U JP H01177611U
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- current source
- discharge current
- supplies
- switch means
- 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 6
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Description
第1図は本考案に係る鋸波電圧発生回路の一実
施例を示す回路図、第2図は第1図の実施例を説
明するためのタイミングチヤート、第3図は本考
案の他の実施例を示す回路図、第4図は従来の鋸
波電圧発生回路を示す回路図、第5図は第4図の
回路を説明するためのタイミングチヤートである
。
1……微分回路、2……フリツプフロツプ(F
/F)、3……出力端子、4……AGC回路、5
……F/V変換回路、A1……演算増幅器、A2
……コンパレータ、IR……放電電流源、IC…
…充電電流源。
FIG. 1 is a circuit diagram showing one embodiment of a sawtooth voltage generating circuit according to the present invention, FIG. 2 is a timing chart for explaining the embodiment of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a circuit diagram showing an example of a conventional sawtooth voltage generating circuit, and FIG. 5 is a timing chart for explaining the circuit of FIG. 4. 1... Differential circuit, 2... Flip-flop (F
/F), 3...Output terminal, 4...AGC circuit, 5
...F/V conversion circuit, A1...Operation amplifier, A2
...Comparator, IR...Discharge current source, IC...
...charging current source.
Claims (1)
分回路と、この積分回路の積分出力と基準電圧と
を比較し積分出力が基準電圧に到達するとパルス
を出力するコンパレータと、水平帰線パルスの前
縁においてオンし前記コンパレータの出力パルス
によりオフするスイツチ手段と、このスイツチ手
段を介して前記コンデンサに接続され、前記スイ
ツチ手段のオン期間において前記コンデンサに放
電電流を流す放電電流源と、この放電電流源とは
逆向きの電流を前記コンデンサに与える充電電流
源とを具備した鋸波電圧発生回路において、 水平偏向周波数に比例した直流電圧を前記放電
電流源に与え前記コンデンサの放電量を制御する
制御手段を具備したことを特徴とする鋸波電圧発
生回路。[Claim for Utility Model Registration] An integrating circuit composed of an operational amplifier and a capacitor, a comparator that compares the integrated output of this integrating circuit with a reference voltage and outputs a pulse when the integrated output reaches the reference voltage, and a horizontal return a switch means that is turned on at the leading edge of a line pulse and turned off by the output pulse of the comparator; and a discharge current source that is connected to the capacitor through the switch means and that causes a discharge current to flow through the capacitor during the on period of the switch means. , and a charging current source that supplies the capacitor with a current in the opposite direction to the discharge current source, the sawtooth voltage generation circuit includes a charging current source that supplies the capacitor with a current in the opposite direction to that of the discharge current source, and supplies the discharge current source with a DC voltage proportional to the horizontal deflection frequency to determine the amount of discharge of the capacitor. 1. A sawtooth voltage generation circuit comprising control means for controlling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7340788U JPH01177611U (en) | 1988-06-03 | 1988-06-03 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7340788U JPH01177611U (en) | 1988-06-03 | 1988-06-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01177611U true JPH01177611U (en) | 1989-12-19 |
Family
ID=31298556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7340788U Pending JPH01177611U (en) | 1988-06-03 | 1988-06-03 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01177611U (en) |
-
1988
- 1988-06-03 JP JP7340788U patent/JPH01177611U/ja active Pending
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