JPS57170621A - Comparing circuit - Google Patents
Comparing circuitInfo
- Publication number
- JPS57170621A JPS57170621A JP56054652A JP5465281A JPS57170621A JP S57170621 A JPS57170621 A JP S57170621A JP 56054652 A JP56054652 A JP 56054652A JP 5465281 A JP5465281 A JP 5465281A JP S57170621 A JPS57170621 A JP S57170621A
- Authority
- JP
- Japan
- Prior art keywords
- emitters
- constant
- trs
- current sources
- hysteresis width
- 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
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
- H03K5/2409—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors
- H03K5/2418—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors with at least one differential stage
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PURPOSE:To obtain optional hysteresis width by connecting both the emitters of two transistors (TR), which are applied with an input voltage at bases, in common through a resistance, and then connecting two constant-current sourceses, which can be switched alternately in response to the input voltage, to both the emitters. CONSTITUTION:Input voltages V1 and V2 are applied to the bases of differential TRs Q1 and Q2. The emitters of those TRs Q1 and Q2 are connectd in common through a resistance R. Further, differential constant-absorbed-current sources 2 and 3 are connected to the emitters of the TRs Q1 and Q2 respectively. Furthermore, the constant-current sources 2 and 3 are provided with switches SW1 and SW2. Then, those switches SW1 and SW2 are changed over to vary transfer characteristics. Therefore, the constant-current sources 2 and 3 are changed over according to the values of output currentsIc1 andIc2 to set hysteresis width optionally. Even when the hysteresis width is extremely narrow, srable operation is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56054652A JPS57170621A (en) | 1981-04-10 | 1981-04-10 | Comparing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56054652A JPS57170621A (en) | 1981-04-10 | 1981-04-10 | Comparing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57170621A true JPS57170621A (en) | 1982-10-20 |
Family
ID=12976710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56054652A Pending JPS57170621A (en) | 1981-04-10 | 1981-04-10 | Comparing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57170621A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61224513A (en) * | 1985-03-28 | 1986-10-06 | Toshiba Corp | Voltage comparator having hysteresis |
| JPS61263305A (en) * | 1985-05-17 | 1986-11-21 | Matsushita Electric Ind Co Ltd | Hysteresis comparator |
-
1981
- 1981-04-10 JP JP56054652A patent/JPS57170621A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61224513A (en) * | 1985-03-28 | 1986-10-06 | Toshiba Corp | Voltage comparator having hysteresis |
| JPS61263305A (en) * | 1985-05-17 | 1986-11-21 | Matsushita Electric Ind Co Ltd | Hysteresis comparator |
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