CN103414459B - With the analog signal input control circuit of forbidden energy/ena-bung function - Google Patents
With the analog signal input control circuit of forbidden energy/ena-bung function Download PDFInfo
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- CN103414459B CN103414459B CN201310400602.1A CN201310400602A CN103414459B CN 103414459 B CN103414459 B CN 103414459B CN 201310400602 A CN201310400602 A CN 201310400602A CN 103414459 B CN103414459 B CN 103414459B
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Abstract
The invention discloses a kind of analog signal input control circuit with forbidden energy/ena-bung function, comprise: for generation of comprise forbidden energy and ena-bung function digital controlled signal digital controlled signal generation unit, for the digital controlled signal of generation being decomposed into the control signal decomposition transform unit that enabled state signal and disabled state signal export, and for the analog signal input-output unit of the input and output of control simulation signal under control signal decomposition transform unit controls.The present invention achieves input control to analog signal, by analog signal input-output unit input and output analog signal owing to being provided with digital controlled signal generation unit, control signal decomposition transform unit and analog signal input-output unit; By the enable or disable signal that digital controlled signal unit sends, determine whether analog signal allows input, avoid the analog signal section that input is invalid; By control signal decomposition transform unit, the break-make of control simulation signal.
Description
Technical field
The present invention relates to a kind of input control circuit, particularly relate to a kind of analog signal input control circuit with forbidden energy/ena-bung function.
Background technology
In prior art, forbidden energy/ena-bung function is generally applied in digital circuit, and the forbidden energy/sheet that is enable or chip for signal selects.In the application of voicefrequency circuit, audio signal is a kind of analog signal, owing to also there is no a kind of control circuit in prior art, the control of forbidden energy/enable is carried out to analog signal, audio signal is caused to there will be some problems in the process of process, such as, occurred invalid signals section in useful signal section, this phenomenon can cause interference and error to the result of signal.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of analog signal input control circuit 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 of band forbidden energy/ena-bung function, comprising:
For generation of the digital controlled signal generation unit of digital controlled signal comprising forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into 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, analog signal described in input and output; When control signal decomposition transform unit exports disabled state signal, block the input and output of analog signal.
Improve as one, described control signal decomposition transform unit comprises: a PNP type triode, a NPN type triode and a NMOS field effect transistor, described PNP type triode is in parallel with the base stage of NPN type triode and be connected to the forbidden energy/enable signal output of described digital controlled signal generation unit, the emitter of described PNP type triode, the collector electrode of described NPN type triode and the gate connected in parallel of described NMOS field effect transistor are also connected to power input, the grounded emitter of described NPN type triode, the drain electrode of described NMOS field effect transistor is electrically connected the collector electrode of described PNP type triode and the input end of analog signal of described analog signal input-output unit respectively, 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 have employed technique scheme, the invention has the beneficial effects as follows:
The present invention achieves input control to analog signal, by analog signal input-output unit input and output analog signal owing to being provided with digital controlled signal generation unit, control signal decomposition transform unit and analog signal input-output unit; By the enable or disable signal that digital controlled signal unit sends, determine whether analog signal allows input, avoid the analog signal section that input is invalid; By control signal decomposition transform unit, the break-make of control simulation signal.
The cut-off that control signal decomposition transform unit utilizes NPN type triode different with PNP type triode and turn-on condition, carry out the break-make of control NMOS field effect transistor, namely forbidden energy/enable control is carried out to analog signal input-output unit, during forbidden energy/enable control signal input EN the input low level of digital controlled signal generation unit, analog signal inputs; During forbidden energy/enable control signal input EN input high level, analog signal no signal inputs, and effectively have chosen useful signal section, avoids the input of invalid signals section, ensure that 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 reduces energy loss.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
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 of band forbidden energy/ena-bung function, comprising:
For generation of the digital controlled signal generation unit of digital controlled signal comprising forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into 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, analog signal described in input and output; When control signal decomposition transform unit exports disabled state signal, block the input and output of analog signal.
As shown in Figure 2, control signal decomposition transform unit comprises: a PNP type triode Q1, a NPN type triode pipe Q2 and NMOS field effect transistor Q3, PNP type triode Q1 is in parallel with the base stage of NPN type triode Q2 and be connected to the forbidden energy/enable signal output EN of digital controlled signal generation unit, the emitter of PNP type triode Q1, the collector electrode of NPN type triode Q2 and the gate connected in parallel of NMOS field effect transistor Q3 are also 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 the collector electrode of PNP type triode Q1 and the input end of analog signal SIGNAL_INPUT of analog signal input-output unit respectively, 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 the following two kinds:
1, when the forbidden energy/enable signal input EN of digital controlled signal generation unit is high level, the input of forbidden energy analog signal SIGNAL_INPUT.
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, and this triode ends.And the base stage of NPN triode Q2 is also high level, this triode ON.After Q2 conducting, the grid of NMOS field effect transistor Q3 pulled down to GND, and be low level, Q3 is turned off, then signal output part SIGNAL_OUTPUT is high-impedance state, and namely no signal exports.
2, when the forbidden energy/enable signal input EN of digital controlled signal generation unit is low level, the input of enable analog signal SIGNAL_INPUT.
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, and this triode ends.And the base stage of PNP triode Q1 is also low level, this triode ON.After Q1 conducting, the grid of NMOS field effect transistor Q3 is essentially pulled up to power end VCC, is high level, Q3 conducting, then signal output part SIGNAL_OUTPUT is by the analog signal output of input.
The present invention achieves input control to analog signal, by analog signal input-output unit input and output analog signal owing to being provided with digital controlled signal generation unit, control signal decomposition transform unit and analog signal input-output unit; By the enable or disable signal that digital controlled signal unit sends, determine whether analog signal allows input, avoid the analog signal section that input is invalid; By control signal decomposition transform unit, the break-make of control simulation signal.
The cut-off that control signal decomposition transform unit utilizes NPN type triode different with PNP type triode and turn-on condition, carry out the break-make of control NMOS field effect transistor, namely forbidden energy/enable control is carried out to analog signal input-output unit, during forbidden energy/enable control signal input EN the input low level of digital controlled signal generation unit, analog signal inputs; During forbidden energy/enable control signal input EN input high level, analog signal no signal inputs, and effectively have chosen useful signal section, avoids the input of invalid signals section, ensure that 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 reduces energy loss.
More than show and describe general 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.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (2)
1. be with the analog signal input control circuit of forbidden energy/ena-bung function, it is characterized in that, comprising:
For generation of the digital controlled signal generation unit of digital controlled signal comprising forbidden energy and ena-bung function;
For the digital controlled signal of generation being decomposed into 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, analog signal described in input and output; When control signal decomposition transform unit exports disabled state signal, block the input and output of analog signal.
2. the analog signal input control circuit as claimed in claim 1 with forbidden energy/ena-bung function, it is characterized in that, described control signal decomposition transform unit comprises: a PNP type triode, a NPN type triode and a NMOS field effect transistor, described PNP type triode is in parallel with the base stage of NPN type triode and be connected to the forbidden energy/enable signal output of described digital controlled signal generation unit, the emitter of described PNP type triode, the collector electrode of described NPN type triode and the gate connected in parallel of described NMOS field effect transistor are also connected to power input, the grounded emitter of described NPN type triode, the drain electrode of described NMOS field effect transistor is electrically connected the collector electrode of described PNP type triode and the input end of analog signal of described analog signal input-output unit respectively, 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 CN103414459A (en) | 2013-11-27 |
| CN103414459B true CN103414459B (en) | 2016-04-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307423B1 (en) * | 2000-05-01 | 2001-10-23 | Xerox Corporation | Programmable circuit with preview function |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6972599B2 (en) * | 2002-08-27 | 2005-12-06 | Micron Technology Inc. | Pseudo CMOS dynamic logic with delayed clocks |
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- 2013-09-05 CN CN201310400602.1A patent/CN103414459B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6307423B1 (en) * | 2000-05-01 | 2001-10-23 | Xerox Corporation | Programmable circuit with preview function |
| 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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