CN104218924A - Low-glitch current switching circuit applicable to real-time dynamic feedback loop - Google Patents
Low-glitch current switching circuit applicable to real-time dynamic feedback loop Download PDFInfo
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- CN104218924A CN104218924A CN201410435961.5A CN201410435961A CN104218924A CN 104218924 A CN104218924 A CN 104218924A CN 201410435961 A CN201410435961 A CN 201410435961A CN 104218924 A CN104218924 A CN 104218924A
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Abstract
The invention discloses a low-glitch current switching circuit applicable to a real-time dynamic feedback loop. The low-glitch current switching circuit comprises a current switch, a programmable control voltage Vclose generation circuit, a programmable logic control voltage Vopen generation circuit, a variable capacitor array, a voltage selector switch, a resistor and two programmable current sources. When the voltage selector switch is connected with a node 1, the programmable logic control voltage Vopen generation circuit charges or discharges a capacitor array C through the resistor R and the current source I1, real-time control voltage Vc reaches voltage Vopen, the current switch is on, and current is off; when the voltage selector is connected with a node 2, the programmable control voltage Vclose generation circuit discharges or charges the capacitor array C through the current source I2, real-time control voltage Vc reaches voltage Vclose, the current switch is off, and current is on. The programmable control voltage Vclose generation circuit has the advantages that switching caused glitch is low, and circuit design is highly flexible.
Description
Technical field
The present invention relates generally to current switching circuit, and especially a kind of low burr current switching circuit being applied to real-time dynamical feedback loop, belongs to electronic circuit design field.
Background technology
Along with the technique of integrated circuit and the development of technology, the integrated level of SoC (System on Chip) is more and more higher, and except the analogy and digital circuit that integrated operating frequency is low, the radio circuit that operating frequency is high is also integrated into SoC.At numerous single-chip integration radio frequency, analogy and digital circuit SoC in, most widely used general, require that the highest is SoC for data wireless transmitting-receiving, particularly have employed the SoC of frequency or phase modulation method.In the wireless transceiver system of frequency or phase-modulation, for the ease of demodulation, reduce error probability when receiving data, the radiofrequency signal needing the dynamic range that received by antenna in real time very large is amplified in a best scope.This makes to adopt the receiver of frequency or phase modulation method by one that faces challenge greatly---design a dynamic feedback control loop accurately in real time.
According to the system performance requirements of receiver, real-time dynamical feedback loop has multiple implementation, the signal advanced person that mode one (shown in Fig. 1), antenna receive crosses the amplification of low noise amplifier, then the output of peak detection circuit to low noise amplification is utilized to detect, according to the operating current of testing result FEEDBACK CONTROL low noise amplifier, the output of low noise amplifier is made to remain on an optimum range; The signal advanced person that mode two (shown in Fig. 2), antenna receive crosses the amplification of low noise amplifier, then through frequency mixer frequency conversion, recycle the output signal strength of accepted theory reaction frequency mixer afterwards, control the operating current of low noise amplifier and frequency mixer according to instruction result feedback, make the output of frequency mixer remain on an optimum range; The signal advanced person that mode three (shown in Fig. 3), antenna receive crosses the amplification of low noise amplifier, then through frequency mixer frequency conversion, entered filter circuit filtering more afterwards, after this output signal strength of accepted theory reaction filter is recycled, control the operating current of low noise amplifier, frequency mixer according to instruction result feedback, make the output of filter remain on an optimum range.Sum up above-mentioned three kinds of modes can draw, in real time feed-back loop, current switching circuit is absolutely necessary module, and the accuracy of burr to feedback control loop of current switching circuit plays conclusive effect.
In the open loop circuit or system of routine, due to the power consumption that current switching circuit is all generally for control circuit, the burr divided ring circuit of current switching circuit or the performance impact of system negligible, therefore general current switching circuit all adopts the framework shown in Fig. 4.The voltage that closes or open of the current switch shown in Fig. 4 directly uses supply voltage VDD or ground, and control signal Vctrl controls two switches, makes the control voltage of current switch be VDD or ground, to realize the shutoff of electric current or to pass through.The advantage that the current switching circuit of this framework is maximum is that structure is simple, and cost is low.But be not suitable for the real-time cyclic system of dynamical feedback accurately, because the current switch of this framework can introduce very large burr in the process of open and close, the precision of the real-time dynamical feedback loop of severe exacerbation.
For solving the problem, patent of the present invention proposes a kind of low burr current switching circuit, and circuit framework as shown in Figure 5.Low burr current switching circuit produces circuit by current switch, PLC technology voltage Vclose, PLC technology voltage Vopen produces circuit, variable capacitor array, voltage-selected switch, a resistance and two programmable current sources form.Current switch open with closed be all charge by programmable current source or resistance to instant voltage or discharge with realizing, the generation of control of burr, the accuracy of guarantee loop.
Summary of the invention
The problem to be solved in the present invention: for existing conventional current switching circuit, when being applied in real-time dynamical feedback loop, meeting insertion switch burr affects this technical problem of circuit accuracy, the invention provides a kind of low burr current switching circuit being applied to real-time dynamical feedback loop.
For realizing above-mentioned technical problem, the solution that the present invention proposes is: a kind of low burr current switching circuit being applied to real-time dynamical feedback loop, it is characterized in that the PLC technology voltage Vopen producing circuit by current switch, the PLC technology voltage Vclose that makes current switch enter closure state, make current switch enter open mode produces circuit, variable capacitor array, voltage-selected switch, a resistance and two programmable current sources and forms.
Above-mentioned low burr current switching circuit, is characterized in that: comprise a control voltage Vclose and produce circuit, and to control the closed of current switch, and the size of voltage Vclose is able to programme, to meet the demand of different application occasion.
Above-mentioned low burr current switching circuit, is characterized in that: comprise a control voltage Vopen and produce circuit, to control opening of current switch, and the size of voltage Vopen is able to programme, to meet the demand of different application occasion.
Above-mentioned low burr current switching circuit, it is characterized in that: comprise a variable capacitor array, one end of capacitor array is connected on instant control voltage Vc node, the other end of capacitor array receives ground, and the size of electric capacity can be programmed according to the response time requirement of real-time dynamical feedback loop.
Above-mentioned low burr current switching circuit, is characterized in that: comprise two programmable current source I
1and I
2, the electric discharge carry out capacitor array C or charging are by current source I
1with resistance R or I
2realize, to control the burr that current switch causes in the process of open and close.
Above-mentioned low burr current switching circuit, is characterized in that: comprise a voltage-selected switch, and when voltage-selected switch is switched to node 1, Vopen voltage generation circuit is except passing through current source I
1outside charging to capacitor array C or discharging, also being charged to electric capacity by resistance R or discharge, make instant control voltage Vc be stabilized to Vopen gradually, current switch is opened, and electric current is by switch OFF.
Above-mentioned low burr current switching circuit, is characterized in that: comprise a voltage-selected switch, and when voltage-selected switch is switched to node 2, Vclose voltage generation circuit is by current source I
2discharge to capacitor array C or charge, making instant control voltage Vc be stabilized to Vclose gradually, current switch closes, and electric current flows through switch.
Compared with prior art, the invention has the advantages that:
1, low burr.Compared with the current switching circuit of routine, present invention employs current source or current source to add resistance and carry out charge or discharge to the electric capacity on instant control voltage Vc, control the sudden change of instant control voltage, restrained effectively the burr that switch causes in the process of state transition, ensure that the accuracy of real-time dynamical feedback loop.
2, design flexibility is strong.Compared with the current switching circuit of routine, the ON-OFF control circuit in of the present invention, charging or discharging current and capacitor array are all programmable, can regulate, have the advantage that flexibility is strong according to different application system demands.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of real-time dynamical feedback loop implementation one;
Fig. 2 is the schematic diagram of real-time dynamical feedback loop implementation two;
Fig. 3 is the schematic diagram of real-time dynamical feedback loop implementation three;
Fig. 4 is conventional current switching circuit schematic diagram;
Fig. 5 is current switching circuit schematic diagram of the present invention;
Fig. 6 is a kind of embodiment schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
embodiment 1
Fig. 6 is a kind of embodiment scheme schematic diagram of the present invention.See Fig. 6:
Described current switch is made up of transistor Mpsw;
Described PLC technology voltage Vclose produces circuit and enters closure state for controlling current switch; By supply voltage VDD, resistance R2 and the variable current source I of circuit
2composition, one end of resistance R2 connects with supply voltage VDD, the other end of resistance R2 and current source I
2one end connect, current source I
2other end ground connection, resistance R2 and current source I
2the node connected produces Vclose voltage, and Vclose's is able to programme by current source I
2realize with the able to programme of resistance R2;
Described PLC technology voltage Vopen produces circuit and enters open mode for controlling current switch; By supply voltage VDD, resistance R1 and the variable current source I of circuit
1composition, current source I
1one end connect with supply voltage VDD, current source I
1the other end connect with one end of resistance R1, the other end ground connection of resistance R1, resistance R1 and current source I
1the node connected produces Vopen voltage, and Vopen's is able to programme by current source I
1realize with the able to programme of resistance R1;
A described variable capacitor array by switch S 1, S2 ... SN and electric capacity C1, C2 ... CN forms, and works as S1, S2 ... when SN closes, corresponding capacitance can access capacitor array, otherwise invalid;
Described voltage-selected switch is made up of transistor MP1, MP2, MN1, when the control voltage Vctrl selected is high level (as VDD), and the source of transistor MN1 and drain terminal conducting, the source of transistor MP1 and MP2 and drain terminal disconnect; Otherwise, when the control voltage Vctrl selected is low level (as), the source of transistor MP1 and MP2 and drain terminal conducting, the source of transistor MN1 and drain terminal disconnect;
Described resistance is made up of resistance R3;
Two described programmable current sources are current source I
1with current source I
2, in order to save power consumption, current source I
1with current source I
2except for generation of except Vopen and Vclose voltage, also for controlling charging to capacitor array C or discharging current.
operation principle:first according to the closed requirement with opening voltage of current switch, to current source I
1, current source I
2, resistance R1 and resistance R2 programmes, and Vclose voltage and Vopen voltage are set to desired value; Then according to real-time dynamical feedback loop to the requirement of response time, choose the total capacitance value of capacitor array; Afterwards according to real-time dynamical feedback loop to the demand of size of current, Vctrl magnitude of voltage is set, allows voltage-selected switch select Vclose or Vopen voltage, make instant control voltage Vc control the closed of current switch or open.
When Vctrl voltage is high level (as VDD), the source of transistor MN1 and drain terminal conducting, the source of transistor MP1 and MP2 and drain terminal disconnect, Vclose voltage is discharged to capacitor array C by transistor MN1, instant control voltage Vc is made to be stabilized to Vclose gradually, current switch is closed, makes electric current flow through switch; The size of current of discharging to capacitor array C is by current source I
2determine, effectively control the burr that switch causes when closed.
When Vctrl voltage be low level (as) time, the source of transistor MP1 and MP2 and drain terminal conducting, the source of transistor MN1 and drain terminal disconnect, Vopen voltage is charged to capacitor array C by transistor MP1 and resistance R3, instant control voltage Vc is made to be stabilized to Vopen gradually, current switch is opened, makes switch off current; The size of current of charging to capacitor array C is by current source I
1determining, effectively controlling the burr that switch causes when opening.
Be to be described in further details the present invention to the description of embodiment 1 above, but the present invention is not limited to above-described embodiment.In addition to the implementation, the technical scheme that the form that all employings are equal to replacement or equivalent transformation obtains, all drops within protection scope of the present invention.
Claims (7)
1. be applied to a low burr current switching circuit for real-time dynamical feedback loop, it is characterized in that producing circuit by current switch, PLC technology voltage Vclose, PLC technology voltage Vopen produces circuit, variable capacitor array, voltage-selected switch, a resistance and two programmable current sources form.
2. low burr current switching circuit according to claim 1, it is characterized in that described circuit comprises a control voltage Vclose and produces circuit, to control the closed of current switch, and the size of voltage Vclose is able to programme, to meet the demand of different application occasion.
3. low burr current switching circuit according to claim 1, it is characterized in that described circuit comprises a control voltage Vopen and produces circuit, to control opening of current switch, and the size of voltage Vopen is able to programme, to meet the demand of different application occasion.
4. low burr current switching circuit according to claim 1, it is characterized in that described circuit comprises a variable capacitor array, one end of capacitor array is connected on instant control voltage Vc node, the other end of capacitor array receives ground, and the size of electric capacity can be programmed according to the response time requirement of real-time dynamical feedback loop.
5. low burr current switching circuit according to claim 1, is characterized in that described circuit comprises two programmable current source I
1and I
2, the electric discharge carry out capacitor array C or charging are by current source I
1with resistance R or I
2realize, to control the burr that current switch causes in the process of open and close.
6. low burr current switching circuit according to claim 1, is characterized in that described circuit comprises a voltage-selected switch, and when voltage-selected switch is switched to node 1, and Vopen voltage generation circuit is except by current source I
1outside charging to capacitor array C or discharging, also being charged to electric capacity by resistance R simultaneously or discharge, make instant control voltage Vc be stabilized to Vopen gradually, current switch is opened, and electric current is by switch OFF.
7. low burr current switching circuit according to claim 1, is characterized in that described circuit comprises a voltage-selected switch, and when voltage-selected switch is switched to node 2, Vclose voltage generation circuit is by current source I
2discharge to capacitor array C or charge, making instant control voltage Vc be stabilized to Vclose gradually, current switch closes, and electric current flows through switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410435961.5A CN104218924A (en) | 2014-09-01 | 2014-09-01 | Low-glitch current switching circuit applicable to real-time dynamic feedback loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410435961.5A CN104218924A (en) | 2014-09-01 | 2014-09-01 | Low-glitch current switching circuit applicable to real-time dynamic feedback loop |
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| CN104218924A true CN104218924A (en) | 2014-12-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445928A (en) * | 2002-01-17 | 2003-10-01 | 三菱电机株式会社 | Drive circuit of power semiconductor element |
| CN1806388A (en) * | 2003-06-12 | 2006-07-19 | 快捷半导体有限公司 | Method of reducing the propagation delay and process and temperature effects on a buffer |
| WO2009090703A1 (en) * | 2008-01-18 | 2009-07-23 | Panasonic Corporation | Ramp wave output circuit, analog/digital conversion circuit, and camera |
| CN101789775A (en) * | 2009-01-23 | 2010-07-28 | 中芯国际集成电路制造(上海)有限公司 | Transmission line drive circuit |
| US8536915B1 (en) * | 2012-07-02 | 2013-09-17 | Qualcomm Incorporated | Low-noise and low-reference spur frequency multiplying delay lock-loop |
-
2014
- 2014-09-01 CN CN201410435961.5A patent/CN104218924A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445928A (en) * | 2002-01-17 | 2003-10-01 | 三菱电机株式会社 | Drive circuit of power semiconductor element |
| CN1806388A (en) * | 2003-06-12 | 2006-07-19 | 快捷半导体有限公司 | Method of reducing the propagation delay and process and temperature effects on a buffer |
| WO2009090703A1 (en) * | 2008-01-18 | 2009-07-23 | Panasonic Corporation | Ramp wave output circuit, analog/digital conversion circuit, and camera |
| CN101789775A (en) * | 2009-01-23 | 2010-07-28 | 中芯国际集成电路制造(上海)有限公司 | Transmission line drive circuit |
| US8536915B1 (en) * | 2012-07-02 | 2013-09-17 | Qualcomm Incorporated | Low-noise and low-reference spur frequency multiplying delay lock-loop |
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Application publication date: 20141217 |
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