CN202940792U - Frequency generator circuit unchanged with voltage change - Google Patents
Frequency generator circuit unchanged with voltage change Download PDFInfo
- Publication number
- CN202940792U CN202940792U CN 201220620714 CN201220620714U CN202940792U CN 202940792 U CN202940792 U CN 202940792U CN 201220620714 CN201220620714 CN 201220620714 CN 201220620714 U CN201220620714 U CN 201220620714U CN 202940792 U CN202940792 U CN 202940792U
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- circuit
- comparator
- frequency generator
- resistance
- output
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Abstract
The utility model discloses a frequency generator circuit unchanged with voltage changes. The circuit comprises an RC circuit and an amplification circuit. The RC circuit is formed by resistors and a capacitor connected in series, an end of the resistor is connected with a power supply and an end of the capacitor is connected with ground. An input end of the amplification circuit is connected with an output end of the RC circuit. An output end of the amplification circuit is connected with an external circuit. The amplification circuit comprises a comparator. A positive input end of the comparator is connected with a joint of the resistor and the capacitor and a switch tube. A negative input end of the comparator is connected with a branch circuit. An output end of the comparator is connected with the switch tube and the external circuit through an inverter. The comparator and the branch circuit are used to offset changes generated by power voltage changes of the RC circuit, output deviation is effectively controlled, so that performance of the frequency generator circuit is greatly improved. One comparator and two resistors are added, price is not high, and cost impact is low.
Description
Technical field
The utility model relates to the integrated circuit (IC) design field, is specifically related to frequency generator circuit.
Background technology
In the circuit of some battery powered systems such as remote controller and so on, supply voltage is along with the consumption of battery electric quantity, and voltage can change, still, for stablizing of whole system, we need to guarantee the stability of frequency, certainly, can make reference circuit by inside, the LDO circuit is realized, but, the Costco Wholesale of considering consumer product requires very high, increases reference circuit, the LDO circuit is very high in technologic requirement, and product will not have competitiveness.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of not with the frequency generator circuit of change in voltage, and can solve prior art need to increase the problem that reference circuit and LDO circuit guarantee that frequency stabilization causes product cost to improve.
The utility model is achieved through the following technical solutions:
A kind of not with the frequency generator circuit of change in voltage, comprise the RC circuit that the capacitor's series by the resistance of a termination power and an end ground connection consists of, and the amplifying circuit that is connected with the output of RC circuit of input, the output of described amplifying circuit is connected with external circuit, described amplifying circuit comprises comparator, the positive input terminal of described comparator is connected respectively tie point and switching tube and is connected with capacitor with resistance, the negative input end of described comparator is connected with bleeder circuit, and the output of described comparator is through inverter, be connected with external circuit with switching tube.
Further scheme of the present utility model is, bleeder circuit is made of the resistance of a termination power and the resistance series connection of an end ground connection, and described resistance is connected tie point and is connected with comparator with resistance.
Further scheme of the present utility model is, switching tube is enhancement mode NMOS pipe, and the grid of described enhancement mode NMOS pipe is connected with the output of inverter, source ground, and draining is connected with the positive input terminal of comparator.
The utility model advantage compared with prior art is:
One, usage comparison device and bleeder circuit are offset the RC circuit with the variation that mains voltage variations produces, and effectively control output bias, make the frequency generator circuit performance be largely increased;
Two, increased a comparator and two resistance, price is not high, and is little to cost impact.
Description of drawings
Fig. 1 is the circuit structure diagram of prior art frequency generator.
Fig. 2 is the circuit structure diagram of frequency generator described in the utility model.
Embodiment
the frequency generator of prior art as shown in Figure 1, comprise the RC circuit that capacitor 2 series connection by the resistance 1 of a termination power 7 and an end ground connection consist of, and the amplifying circuit that is connected with the output of RC circuit of input, the output 6 of described amplifying circuit is connected with external circuit, described amplifying circuit is by the inverter 11 of NMOS pipe 3 and series connection, 4, 5 consist of, the source ground of described NMOS pipe 3, the input of inverter 11 is connected respectively the drain electrode of the tie point of being connected with capacitor and NMOS pipe 3 and is connected with resistance, the output of described inverter 5 is connected with external circuit with the grid of NMOS pipe 3 respectively.
As shown in Figure 2 a kind of not with the frequency generator circuit of change in voltage, the difference of comparing with Fig. 1 is: amplifying circuit comprises comparator 8, switching tube 3, bleeder circuit, inverter 4,5, the positive input terminal of described comparator 8 is connected respectively the tie point of being connected with capacitor and switching tube 3 and is connected with resistance, the negative input end of described comparator 8 is connected with the output of bleeder circuit, and the output of described comparator 8 is connected with external circuit with switching tube 3 through inverter 4,5.
As shown in Figure 2, bleeder circuit is made of the resistance 9 of a termination power 7 and resistance 10 series connection of an end ground connection, and the tie point that described resistance 9 is connected with resistance is connected with comparator 8.
As Fig. 1 or circuit diagram shown in Figure 2, switching tube 3 is enhancement mode NMOS pipe, and the grid of described enhancement mode NMOS pipe is connected with the output of inverter 5, source ground, and drain electrode is connected with the positive input terminal of comparator 8.。
The output signal of the bleeder circuit that the negative input end of comparator receives, it is a reference voltage value that geometric ratio changes with mains voltage variations, the RC circuit output signal that the positive input terminal of comparator receives, also geometric ratio changes along with the variation of supply voltage, the variation of the input signal of the positive and negative input of comparator is cancelled out each other, and makes last output not with the impact of voltage.
Take the battery powered wireless signaling circuit of 12V as example, the operating voltage range that whole chip requires is 4 ~ 12V, and the deviation of the frequency generator of prior art is up to 20%, and the utility model can be controlled in the voltage range of 3 ~ 12V, and deviation is less than 5%.
Claims (3)
1. one kind with the frequency generator circuit of change in voltage, comprise the RC circuit that capacitor (2) series connection by the resistance (1) of a termination power (7) and an end ground connection consists of, and the amplifying circuit that is connected with the output of RC circuit of input, the output of described amplifying circuit (6) is connected with external circuit, it is characterized in that: described amplifying circuit comprises comparator (8), the positive input terminal of described comparator (8) is connected 2 with resistance (1) with capacitor respectively) tie point and switching tube (3) be connected, the negative input end of described comparator (8) is connected with bleeder circuit, the output of described comparator (8) is through inverter (4, 5) be connected with external circuit with switching tube (3).
2. as claimed in claim 1 a kind of not with the frequency generator circuit of change in voltage, it is characterized in that: described bleeder circuit is made of resistance (10) series connection of the resistance (9) of a termination power (7) and an end ground connection, and described resistance (9) is connected 10 with resistance) tie point be connected with comparator (8).
3. as claimed in claim 1 a kind of not with the frequency generator circuit of change in voltage, it is characterized in that: described switching tube (3) is enhancement mode NMOS pipe, the grid of described enhancement mode NMOS pipe is connected with the output of inverter (5), source ground, drain electrode is connected with the positive input terminal of comparator (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220620714 CN202940792U (en) | 2012-11-22 | 2012-11-22 | Frequency generator circuit unchanged with voltage change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220620714 CN202940792U (en) | 2012-11-22 | 2012-11-22 | Frequency generator circuit unchanged with voltage change |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940792U true CN202940792U (en) | 2013-05-15 |
Family
ID=48325014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220620714 Expired - Lifetime CN202940792U (en) | 2012-11-22 | 2012-11-22 | Frequency generator circuit unchanged with voltage change |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940792U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957421A (en) * | 2012-11-22 | 2013-03-06 | 江苏格立特电子有限公司 | Frequency generator circuit without changes along with voltage |
-
2012
- 2012-11-22 CN CN 201220620714 patent/CN202940792U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957421A (en) * | 2012-11-22 | 2013-03-06 | 江苏格立特电子有限公司 | Frequency generator circuit without changes along with voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XIE WEIGUO Free format text: FORMER OWNER: JIANGSU GELITE ELECTRONICS CO., LTD. Effective date: 20130729 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130729 Address after: 223900, Jiangsu, Suqian province Sihong County Construction North Road and Jinsha River Road Electronic Industrial Park, No. 10 factory building Patentee after: Xie Weiguo Address before: 223900, Jiangsu, Suqian province Sihong County Construction North Road and Jinsha River Road Electronic Industrial Park, No. 10 factory building Patentee before: JIANGSU GELITE ELECTRONICS Co.,Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU GELITE ELECTRONICS CO., LTD. Free format text: FORMER OWNER: XIE WEIGUO Effective date: 20140121 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140121 Address after: 223900, Jiangsu, Suqian province Sihong County Construction North Road and Jinsha River Road Electronic Industrial Park, No. 10 factory building Patentee after: JIANGSU GELITE ELECTRONICS Co.,Ltd. Address before: 223900, Jiangsu, Suqian province Sihong County Construction North Road and Jinsha River Road Electronic Industrial Park, No. 10 factory building Patentee before: Xie Weiguo |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130515 |