JPS57121316A - Sweep voltage generating circuit - Google Patents
Sweep voltage generating circuitInfo
- Publication number
- JPS57121316A JPS57121316A JP771481A JP771481A JPS57121316A JP S57121316 A JPS57121316 A JP S57121316A JP 771481 A JP771481 A JP 771481A JP 771481 A JP771481 A JP 771481A JP S57121316 A JPS57121316 A JP S57121316A
- Authority
- JP
- Japan
- Prior art keywords
- current
- trs
- constant
- collector
- sweep
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/50—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE:To perform the sweep of a long period with a high precision, by charging a capacitor by the difference between two constant currents. CONSTITUTION:When a power source voltage B is divided by a comparatively high resistance R1 and diodes D1 and D2 and is applied to the base of a transistor (TR) Q2, the collector current of the TR Q2 is constant comparatively against the fluctuation of the power source voltage. TRs Q1, Q3, and Q6 constitute a current mirror circuit, and collector currents I2 and I3 of TRs Q3 and Q6 correspond to respective emitter areas. By a current mirror circuit of TRs Q4 and Q5, the collector current of the TR Q5 is equal to the collector current I2 of the TR Q3. A capacitor C is charged by a constant current I3-I2 to generate a sweep voltage in an output terminal. A TR Q7 is made conductive periodically to reset the circuit, thereby generating a saw-tooth wave voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP771481A JPS57121316A (en) | 1981-01-20 | 1981-01-20 | Sweep voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP771481A JPS57121316A (en) | 1981-01-20 | 1981-01-20 | Sweep voltage generating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57121316A true JPS57121316A (en) | 1982-07-28 |
Family
ID=11673405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP771481A Pending JPS57121316A (en) | 1981-01-20 | 1981-01-20 | Sweep voltage generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57121316A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60119136U (en) * | 1984-01-23 | 1985-08-12 | 東光株式会社 | charge/discharge circuit |
| JPS62254512A (en) * | 1986-04-28 | 1987-11-06 | Canon Inc | Signal wave ooscillation circuit |
| JP2007043862A (en) * | 2005-08-05 | 2007-02-15 | Rohm Co Ltd | Soft start circuit, power supply, electric apparatus |
-
1981
- 1981-01-20 JP JP771481A patent/JPS57121316A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60119136U (en) * | 1984-01-23 | 1985-08-12 | 東光株式会社 | charge/discharge circuit |
| JPH0224271Y2 (en) * | 1984-01-23 | 1990-07-03 | ||
| JPS62254512A (en) * | 1986-04-28 | 1987-11-06 | Canon Inc | Signal wave ooscillation circuit |
| JP2623467B2 (en) * | 1986-04-28 | 1997-06-25 | キヤノン株式会社 | Signal wave oscillation circuit |
| JP2007043862A (en) * | 2005-08-05 | 2007-02-15 | Rohm Co Ltd | Soft start circuit, power supply, electric apparatus |
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