CN103414459A - Analog signal input control circuit with forbidding/enabling functions - Google Patents
Analog signal input control circuit with forbidding/enabling functions Download PDFInfo
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- CN103414459A CN103414459A CN2013104006021A CN201310400602A CN103414459A CN 103414459 A CN103414459 A CN 103414459A CN 2013104006021 A CN2013104006021 A CN 2013104006021A CN 201310400602 A CN201310400602 A CN 201310400602A CN 103414459 A CN103414459 A CN 103414459A
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Abstract
The invention discloses an analog signal input control circuit with forbidding/enabling functions, and the circuit comprises a digital control signal generation unit which is used for generating a digital control signal with forbidding and enabling functions, a control signal decomposition and conversion unit which is used for decomposing the generated digital control signal into an enabling state signal and a forbidding state signal and outputting the same, and an analog signal input and output unit which is used for inputting and outputting an analog signal under the control of the control signal decomposition and conversion unit. According to the analog signal input control circuit with forbidding/enabling functions, due to the digital control signal generation unit, the control signal decomposition and conversion unit and the analog signal input and output unit, the input control on the analog signal is realized, and the analog signal is input and output through the analog signal input and output unit; whether the analog signal is allowed to be input or not is decided through the enabling or forbidding signal sent by the digital control signal unit, so that the inputting of an invalid analog signal field is prevented; the on and off of the analog signal is controlled through the control signal decomposition and conversion unit.
Description
Technical field
The present invention relates to a kind of input control circuit, relate in particular to a kind of input control circuit of analog signal with forbidden energy/ena-bung function.
Background technology
In prior art, forbidden energy/ena-bung function generally is applied in digital circuit, for the sheet choosing of the forbidden energy of signal/enable or chip.In the application of voicefrequency circuit, audio signal is a kind of analog signal, owing in prior art, also not having a kind of control circuit analog signal to be carried out to the control of forbidden energy/enable, cause audio signal to there will be some problems in the process of processing, for example in the useful signal section, the invalid signals section occurred, this phenomenon can cause the result of signal to be disturbed and error.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of input control circuit of analog signal with forbidden energy/ena-bung function, to realize the input control to analog signal.
For solving the problems of the technologies described above, technical scheme of the present invention is: the analog signal input control circuit with forbidden energy/ena-bung function comprises:
Digital controlled signal generation unit for generation of the digital controlled signal that comprises forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into to the control signal decomposition transform unit of enabled state signal and the output of disabled state signal;
For the analog signal input-output unit of the input and output of control simulation signal under control signal decomposition transform unit controls, when control signal decomposition transform unit output enable status signal, the described analog signal of input and output; When control signal decomposition transform unit output disabled state signal, the input and output of blocking-up analog signal.
As a kind of improvement, described control signal decomposition transform unit comprises: a positive-negative-positive triode, a NPN type triode and a NMOS field effect transistor, described positive-negative-positive triode is in parallel with the base stage of NPN type triode and be connected to the forbidden energy of described digital controlled signal generation unit/enable signal output, the grid parallel connection of the collector electrode of described two triodes and described NMOS field effect transistor also is connected to power input, the grounded emitter of described NPN type triode, the drain electrode of described NMOS field effect transistor is electrically connected to respectively the emitter of described positive-negative-positive triode and the input end of analog signal of described analog signal input-output unit, the source electrode of described NMOS field effect transistor is electrically connected to the analog signal output of described analog signal input-output unit.
Owing to having adopted technique scheme, the invention has the beneficial effects as follows:
The present invention has realized the input control to analog signal owing to being provided with digital controlled signal generation unit, control signal decomposition transform unit and analog signal input-output unit, by analog signal input-output unit input and output analog signal; By enabling or disable signal that the digital controlled signal unit sends, determine that whether analog signal allows input, has avoided inputting invalid analog signal section; By control signal decomposition transform unit, the break-make of control simulation signal.
Control signal decomposition transform unit by using NPN type triode cut-off and the turn-on condition different with the positive-negative-positive triode, control the break-make of NMOS field effect transistor, namely the analog signal input-output unit being carried out to forbidden energy/enable controls, the forbidden energy of digital controlled signal generation unit/while enabling control signal input EN input low level, the analog signal input; Forbidden energy/while enabling control signal input EN input high level, the input of analog signal no signal, effectively chosen the useful signal section, avoided the input of invalid signals section, guaranteed the accuracy of signal processing results.
The present invention, by the input and output of control simulation signal, makes connection or the cut-off of analog signal input and output loop choice, and not only circuit structure is simple, and control method is easy, and has reduced energy loss.
The accompanying drawing explanation
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structured flowchart of the embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Embodiment
As shown in Figure 1, the analog signal input control circuit with forbidden energy/ena-bung function comprises:
Digital controlled signal generation unit for generation of the digital controlled signal that comprises forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into to the control signal decomposition transform unit of enabled state signal and the output of disabled state signal;
For the analog signal input-output unit of the input and output of control simulation signal under control signal decomposition transform unit controls, when control signal decomposition transform unit output enable status signal, the described analog signal of input and output; When control signal decomposition transform unit output disabled state signal, the input and output of blocking-up analog signal.
As shown in Figure 2, control signal decomposition transform unit comprises: a positive-negative-positive triode Q1, a NPN type triode pipe Q2 and a NMOS field effect transistor Q3, positive-negative-positive triode Q1 is in parallel with the base stage of NPN type triode Q2 and be connected to the forbidden energy of digital controlled signal generation unit/enable signal output EN, the collector electrode of two triode Q1 and Q2 and the grid of NMOS field effect transistor Q3 are in parallel and be connected to power input VCC, the grounded emitter of NPN type triode Q2, the drain electrode of NMOS field effect transistor Q3 is electrically connected to respectively the emitter of positive-negative-positive triode Q1 and the input end of analog signal SIGNAL_INPUT of analog signal input-output unit, the source electrode of NMOS field effect transistor Q3 is electrically connected to the analog signal output SIGNAL_OUTPUT of analog signal input-output unit.
The mode of operation of the present embodiment has following two kinds:
1, when the forbidden energy of digital controlled signal generation unit/enable signal input EN is high level, the input of forbidden energy analog signal SIGNAL_INPUT.
The specific works principle is as follows: when forbidden energy/enable signal input EN input high level, the base stage of PNP triode Q1 is high level, this triode cut-off.And the base stage of NPN triode Q2 is also high level, this triode conducting.After the Q2 conducting, the grid of NMOS field effect transistor Q3 pulled down to GND, is low level, and Q3 is turned off, and signal output part SIGNAL_OUTPUT is high-impedance state, i.e. no signal output.
2,, when the forbidden energy of digital controlled signal generation unit/enable signal input EN is low level, enable the input of analog signal SIGNAL_INPUT.
The specific works principle is as follows: when forbidden energy/enable signal input EN input low level, the base stage of NPN triode Q2 is low level, this triode cut-off.And the base stage of PNP triode Q1 is also low level, this triode conducting.After the Q1 conducting, the grid of NMOS field effect transistor Q3 by move power end VCC to, be high level, Q3 conducting, the analog signal output that will input of signal output part SIGNAL_OUTPUT.
The present invention has realized the input control to analog signal owing to being provided with digital controlled signal generation unit, control signal decomposition transform unit and analog signal input-output unit, by analog signal input-output unit input and output analog signal; By enabling or disable signal that the digital controlled signal unit sends, determine that whether analog signal allows input, has avoided inputting invalid analog signal section; By control signal decomposition transform unit, the break-make of control simulation signal.
Control signal decomposition transform unit by using NPN type triode cut-off and the turn-on condition different with the positive-negative-positive triode, control the break-make of NMOS field effect transistor, namely the analog signal input-output unit being carried out to forbidden energy/enable controls, the forbidden energy of digital controlled signal generation unit/while enabling control signal input EN input low level, the analog signal input; Forbidden energy/while enabling control signal input EN input high level, the input of analog signal no signal, effectively chosen the useful signal section, avoided the input of invalid signals section, guaranteed the accuracy of signal processing results.
The present invention, by the input and output of control simulation signal, makes connection or the cut-off of analog signal input and output loop choice, and not only circuit structure is simple, and control method is easy, and has reduced energy loss.
Above demonstration and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand, and the present invention is not restricted to the described embodiments, and without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (2)
1. with the analog signal input control circuit of forbidden energy/ena-bung function, it is characterized in that, comprising:
Digital controlled signal generation unit for generation of the digital controlled signal that comprises forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into to the control signal decomposition transform unit of enabled state signal and the output of disabled state signal;
For the analog signal input-output unit of the input and output of control simulation signal under control signal decomposition transform unit controls, when control signal decomposition transform unit output enable status signal, the described analog signal of input and output; When control signal decomposition transform unit output disabled state signal, the input and output of blocking-up analog signal.
2. the input control circuit of the analog signal with forbidden energy/ena-bung function as claimed in claim 1, it is characterized in that, described control signal decomposition transform unit comprises: a positive-negative-positive triode, a NPN type triode and a NMOS field effect transistor, described positive-negative-positive triode is in parallel with the base stage of NPN type triode and be connected to the forbidden energy of described digital controlled signal generation unit/enable signal output, the grid parallel connection of the collector electrode of described two triodes and described NMOS field effect transistor also is connected to power input, the grounded emitter of described NPN type triode, the drain electrode of described NMOS field effect transistor is electrically connected to respectively the emitter of described positive-negative-positive triode and the input end of analog signal of described analog signal input-output unit, the source electrode of described NMOS field effect transistor is electrically connected to the analog signal output of described analog signal input-output unit.
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| CN201310400602.1A CN103414459B (en) | 2013-09-05 | 2013-09-05 | With the analog signal input control circuit of forbidden energy/ena-bung function |
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| CN201310400602.1A CN103414459B (en) | 2013-09-05 | 2013-09-05 | With the analog signal input control circuit of forbidden energy/ena-bung function |
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| CN103414459A true CN103414459A (en) | 2013-11-27 |
| CN103414459B CN103414459B (en) | 2016-04-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307423B1 (en) * | 2000-05-01 | 2001-10-23 | Xerox Corporation | Programmable circuit with preview function |
| US20040041591A1 (en) * | 2002-08-27 | 2004-03-04 | Micron Technology, Inc. | Pseudo CMOS dynamic logic with delayed clocks |
| CN101212139A (en) * | 2006-12-29 | 2008-07-02 | 鸿富锦精密工业（深圳）有限公司 | Main board power supply protection circuit |
| CN101540585A (en) * | 2008-03-21 | 2009-09-23 | 珠海全志科技有限公司 | Amplifier |
-
2013
- 2013-09-05 CN CN201310400602.1A patent/CN103414459B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307423B1 (en) * | 2000-05-01 | 2001-10-23 | Xerox Corporation | Programmable circuit with preview function |
| US20040041591A1 (en) * | 2002-08-27 | 2004-03-04 | Micron Technology, Inc. | Pseudo CMOS dynamic logic with delayed clocks |
| CN101212139A (en) * | 2006-12-29 | 2008-07-02 | 鸿富锦精密工业（深圳）有限公司 | Main board power supply protection circuit |
| CN101540585A (en) * | 2008-03-21 | 2009-09-23 | 珠海全志科技有限公司 | Amplifier |
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| CN103414459B (en) | 2016-04-13 |
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