CN204652353U - Debugger D/A converting circuit - Google Patents
Debugger D/A converting circuit Download PDFInfo
- Publication number
- CN204652353U CN204652353U CN201520478552.3U CN201520478552U CN204652353U CN 204652353 U CN204652353 U CN 204652353U CN 201520478552 U CN201520478552 U CN 201520478552U CN 204652353 U CN204652353 U CN 204652353U
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- Prior art keywords
- operational amplifier
- filter
- single supply
- supply operational
- circuit
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Abstract
The utility model relates to a kind of debugger D/A converting circuit, belong to electronic industrial technology field, the filter circuit, the signal output part that comprise digital PWM signal end, are composed in series by a filter resistance and a filter capacitor, digital PWM signal end is connected with filter circuit, filter capacitor rear end ground connection, described filter circuit connects the input in the same way of single supply operational amplifier, amplifier out connection signal output, the positive pole of single supply operational amplifier meets power supply+5V, the minus earth of single supply operational amplifier.Solve the problem with similar functional circuit carrying load ability difference, there is the advantage that output resistance is little, carrying load ability is strong, error is little, simple and reliable.
Description
technical field:
The utility model relates to a kind of debugger D/A converting circuit, belongs to electronic industrial technology field.
background technology:
The existing existing debugger for debugging circuit board, many times need to simulate different voltage and be supplied to debugged circuit board, general is all the digital PWM signal utilizing the digitial controller output duty cycle in debugger adjustable, the output of different voltage was simulated again afterwards through capacitance-resistance filter, by regulating the size of duty ratio size adjustable output voltage, but there is the deficiency of carrying load ability difference in the circuit of this direct capacitance-resistance filter when high-quality filtering.
summary of the invention:
Technical problem to be solved in the utility model is: provide a kind of increase to have the D/A converting circuit of single supply operational amplifier and pull down resistor, this circuit has outstanding carrying load ability.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of debugger D/A converting circuit, the filter circuit, the signal output part that comprise digital PWM signal end, are composed in series by a filter resistance and a filter capacitor, digital PWM signal end is connected with filter circuit, filter capacitor rear end ground connection, described filter circuit connects the input in the same way of single supply operational amplifier, amplifier out connection signal output, the positive pole of single supply operational amplifier meets power supply+5V, the minus earth of single supply operational amplifier.
As preferably, the described reverse input end of single supply operational amplifier is connected with one end of pull down resistor, reduces error during low-voltage output, and the other end of described pull down resistor is connected to power supply-12V.
Compared with prior art, usefulness of the present utility model is: reduce output resistance when being amplified in equal quality filtering by operational amplifier homophase, again owing to being connected to pull down resistor at output, reduce error during low-voltage output, improve the linear correlation degree of duty ratio and output voltage, more convenient by regulating duty ratio size with the size of regulation output voltage, thus there is the advantage that output resistance is little, carrying load ability is strong, error is little, simple and reliable.
accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is circuit theory diagrams of the present utility model.
In figure: IN, digital PWM signal end, OUT, signal output part, R1, filter resistance, R2, pull down resistor, C, filter capacitor, U, single supply operational amplifier, U1, in the same way input, U2, reverse input end, U3, positive pole, U4, negative pole, U5, amplifier out.
embodiment:
Below in conjunction with the drawings and the specific embodiments, the utility model is described in detail:
A kind of debugger D/A converting circuit according to Fig. 1, comprise digital PWM signal end IN, by an a filter resistance R1 and filter circuit that filter capacitor C is composed in series, signal output part OUT, digital PWM signal end IN is connected with filter circuit, filter capacitor C rear end ground connection GND, described filter circuit connects the U1 of input in the same way of single supply operational amplifier U, amplifier out U5 connection signal output OUT, the U3 of single supply operational amplifier U positive pole meets power supply+5V, the negative pole U4 ground connection GND of single supply operational amplifier U; The reverse input end U2 of single supply operational amplifier U is connected with one end of pull down resistor R2, and the other end of described pull down resistor R2 is connected to power supply-12V.
During use, the U1 of input in the same way of resistance R1 mono-termination digital PWM signal end IN, another termination filter capacitor C and single supply operational amplifier U, pull down resistor R2 mono-termination-12V power supply, reverse input end U2 and the amplifier out U5 of single supply operational amplifier U meet signal output part OUT jointly, filter capacitor C and single supply operational amplifier U common ground GND, single supply operational amplifier U is by+5V Power supply.
It is emphasized that: be only preferred embodiment of the present utility model above, not any pro forma restriction is done to the utility model, every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (2)
1. a debugger D/A converting circuit, comprise digital PWM signal end (IN), the filter circuit be composed in series by a filter resistance (R1) and a filter capacitor (C), signal output part (OUT), digital PWM signal end (IN) is connected with filter circuit, filter capacitor (C) rear end ground connection (GND), it is characterized in that: described filter circuit connects the input in the same way (U1) of single supply operational amplifier (U), amplifier out (U5) connection signal output (OUT), the positive pole (U3) of single supply operational amplifier (U) meets power supply+5V, negative pole (U4) ground connection (GND) of single supply operational amplifier (U).
2. debugger D/A converting circuit according to claim 1, it is characterized in that: the reverse input end (U2) of described single supply operational amplifier (U) is connected with one end of pull down resistor (R2), and the other end of described pull down resistor (R2) is connected to power supply-12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520478552.3U CN204652353U (en) | 2015-07-06 | 2015-07-06 | Debugger D/A converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520478552.3U CN204652353U (en) | 2015-07-06 | 2015-07-06 | Debugger D/A converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204652353U true CN204652353U (en) | 2015-09-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520478552.3U Active CN204652353U (en) | 2015-07-06 | 2015-07-06 | Debugger D/A converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204652353U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104954023A (en) * | 2015-07-06 | 2015-09-30 | 康力电梯股份有限公司 | Digital-to-analogue conversion circuit for debugging platform |
-
2015
- 2015-07-06 CN CN201520478552.3U patent/CN204652353U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104954023A (en) * | 2015-07-06 | 2015-09-30 | 康力电梯股份有限公司 | Digital-to-analogue conversion circuit for debugging platform |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |