CN109947168A - A kind of low noise low differential voltage linear voltage stabilizer circuit - Google Patents
A kind of low noise low differential voltage linear voltage stabilizer circuit Download PDFInfo
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- CN109947168A CN109947168A CN201910227846.1A CN201910227846A CN109947168A CN 109947168 A CN109947168 A CN 109947168A CN 201910227846 A CN201910227846 A CN 201910227846A CN 109947168 A CN109947168 A CN 109947168A
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Abstract
The invention discloses a kind of low noise low differential voltage linear voltage stabilizer circuits comprising voltage input end, voltage output end, biasing circuit, error amplifier, partial pressure feed circuit, Serial regulation pipe and filter capacitor；The linear regulation pipe connects into common drain structure or common collector configuration；Voltage input end connects the input terminal of Serial regulation pipe and the input terminal of biasing circuit, the non-inverting input terminal of the output end connection error amplifier of biasing circuit, the output end of the inverting input terminal connection partial pressure feed circuit of error amplifier, the control terminal of output end connection filter capacitor one end and Serial regulation pipe of error amplifier, filter capacitor other end ground connection, voltage output end connect the output end of Serial regulation pipe and the input terminal of partial pressure feed circuit.Noise remove ability of the invention is not influenced by load variation.
Description
Technical field
The present invention relates to field of circuit technology, particularly relate to a kind of low noise low differential voltage linear voltage stabilizer circuit.
Background technique
The advantages that low pressure difference linear voltage regulator is simple with its circuit structure, chip occupying area is small and output ripple is small, extensively
The general electric power management circuit for being applied to simulate, in radio circuit.Meanwhile to the circuit mould of noise-sensitive in simulation, radio circuit
There is low output to make an uproar for block, such as phaselocked loop, voltage controlled oscillator and low-noise amplifier circuit requirement low pressure difference linear voltage regulator
Sound characteristics.
As shown in Figure 1, existing low noise low pressure difference linear voltage regulator, mainly defeated including voltage input end Vin ', voltage
Outlet Vout ', biasing circuit 1 ', error amplifier EA ', p-type field-effect tube MP1 ', partial pressure feed circuit 2 ' and filter capacitor
C2 ', the wherein input terminal of the source electrode of voltage input end Vin ' connection field-effect tube MP1 ' and biasing circuit 1 ', voltage output end
The drain electrode of Vout ' connection field-effect tube MP1 ', one end of filter capacitor C2 ' and the input terminal for dividing feed circuit 2 ', filtering
Capacitor C2 ' other end ground connection；The output end of the non-inverting input terminal connection partial pressure feed circuit 2 ' of error amplifier EA ', error are put
The output end of the inverting input terminal connection biasing circuit 1 ' of big device EA ', the output end of error amplifier EA ' connect field-effect tube
The grid of MP1 '；Wherein biasing circuit 1 ' includes reference voltage generating circuit 11 ' and RC low-pass filter circuit 12 ', reference voltage
The input terminal of generation circuit 11 ' is the input terminal of the biasing circuit 1 ', and the output end of reference voltage generating circuit 11 ' connects RC
The input terminal of low-pass filter circuit 12 ', the output end of RC low-pass filter circuit 12 ' are the output end of the biasing circuit 1 ', RC
Low-pass filter circuit 12 ' may include first resistor R1 ' and first capacitor C1 ', the one end first resistor R1 ' and first capacitor C1 ' one
End is connected, and the first resistor R1 ' other end is the input terminal of RC low-pass filter circuit 12 ', first resistor R1 ' and first capacitor C1 '
Common end be RC low-pass filter circuit 12 ' output end, the first capacitor C1 ' other end ground connection；Dividing feed circuit 2 ' includes
The one end second resistance R2 ' and 3rd resistor R3 ', second resistance R2 ' is the input terminal for dividing feed circuit 2 ', second resistance R2 '
The other end is connected with the one end 3rd resistor R3 ', 3rd resistor R3 ' other end ground connection, second resistance R2 ' and 3rd resistor R3's '
Common end is the output end for dividing feed circuit 2 '.
The working principle of the low noise low pressure difference linear voltage regulator are as follows: if the voltage of voltage output end Vin ' increases, then
The voltage for dividing the output end output of feed circuit 2 ' increases, i.e. the non-inverting input terminal voltage of error amplifier EA ' increases, error
Amplifier EA ' inverting input terminal voltage is provided by biasing circuit 1 ', and error amplifier EA ' is defeated by non-inverting input terminal voltage and reverse phase
Enter to hold voltage to compare and the output end voltage of error amplifier EA ' is increased, the grid voltage of such field-effect tube MP1 '
It increases, and the raising of the grid voltage of field-effect tube MP1 ' declines the drain voltage of field-effect tube MP1 ', i.e., so that voltage
The voltage of output end Vin ' declines；And if the voltage of voltage output end Vin ' declines, then divides the output end of feed circuit 2 '
The voltage of output declines, i.e. the non-inverting input terminal voltage decline of error amplifier EA ', and error amplifier EA ' is by non-inverting input terminal
Voltage and inverting input terminal voltage compare and the output end voltage of error amplifier EA ' are declined, such field-effect tube
The grid voltage of MP1 ' declines, and the decline of the grid voltage of field-effect tube MP1 ' then makes the drain voltage liter of field-effect tube MP1 '
Height, i.e., so that the voltage of voltage output end Vin ' increases；Therefore pass through biasing circuit 1 ', error amplifier EA ' and partial pressure feedback
Circuit 2 ' can form negative-feedback and guarantee that the voltage of voltage output end Vin ' is constant.
The noise main source of the low noise low pressure difference linear voltage regulator has: the input voltage of voltage input end Vin ' access
Noise, the field-effect tube MP1 ' that noise, the error amplifier EA ' that noise, the reference voltage generating circuit 11 ' of introducing introduce are introduced
The noise that the noise and partial pressure feed circuit 2 ' of introducing introduce；The principle of low noise low pressure difference linear voltage regulator reduction noise
It is: by using reference voltage generating circuit 11 ' and the error amplifier EA ' with high PSRR to reduce voltage input
The noise for holding the input voltage of Vin ' access to introduce, is removed by RC low-pass filter circuit 12 ' by reference voltage generating circuit 11 '
The noise of introducing maintains the low noise low pressure difference linear voltage regulator to remove the low noise while stabilization by filter capacitor C2 '
The overall noise of low pressure difference linear voltage regulator.
But the low noise low pressure difference linear voltage regulator has the following problems: the master of the low noise low pressure difference linear voltage regulator
Pole is located on voltage output end Vout ', i.e., the dominant pole of the low noise low pressure difference linear voltage regulator is located at field-effect tube MP1 '
Drain electrode on, when load significantlys change, dominant pole ' be also widely varied therewith so that the low noise low pressure difference linearity pressure stabilizing
The stability of device is affected；Meanwhile when the low noise low pressure difference linear voltage regulator is in heavily loaded mode, the voltage output end
The equivalent impedance of Vout ' reduces, this will lead to dominant pole far from origin, so that the noise of the low noise low pressure difference linear voltage regulator
Removal ability reduces；In order to guarantee that the low noise low pressure difference linear voltage regulator in noise remove ability when overloaded, can will filter
The capacitance of capacitor C2 ' improves, and the raising of the capacitance of filter capacitor C2 ' can improve production cost.
Summary of the invention
The purpose of the present invention is to provide a kind of low noise low differential voltage linear voltage stabilizer circuits, can eliminate load variation pair
The influence of the noise remove ability of the low noise low differential voltage linear voltage stabilizer circuit.
In order to achieve the above objectives, solution of the invention is:
A kind of low noise low differential voltage linear voltage stabilizer circuit comprising voltage input end, voltage output end, biasing circuit,
Error amplifier, partial pressure feed circuit, Serial regulation pipe and filter capacitor；The linear regulation pipe connects into common drain structure
Or common collector configuration；Voltage input end connects the input terminal of Serial regulation pipe and the input terminal of biasing circuit, biasing circuit
Output end connects the non-inverting input terminal of error amplifier, the output of the inverting input terminal connection partial pressure feed circuit of error amplifier
End, the control terminal of output end connection filter capacitor one end and Serial regulation pipe of error amplifier, filter capacitor other end ground connection,
Voltage output end connects the output end of Serial regulation pipe and the input terminal of partial pressure feed circuit.
The Serial regulation pipe is bipolar transistor, and the collector of the bipolar transistor connects voltage input end, should
The emitter of bipolar transistor connects voltage output end, the output of the base stage connection error amplifier of the bipolar transistor
End.
The biasing circuit includes reference voltage generating circuit and RC low-pass filter circuit, reference voltage generating circuit it is defeated
Enter the input terminal that end is the biasing circuit, the input of the output end connection RC low-pass filter circuit of reference voltage generating circuit
End, the output end of RC low-pass filter circuit are the output end of the biasing circuit.
The RC low-pass filter circuit includes first resistor and first capacitor, first resistor one end and first capacitor one end phase
Even, the first resistor other end is the input terminal of RC low-pass filter circuit, and the common end of first resistor and first capacitor is RC low pass
The output end of filter circuit, first capacitor other end ground connection.
After adopting the above scheme, linear regulation pipe of the invention connects into common drain structure or common collector configuration, and
The control terminal of output end connection filter capacitor one end and Serial regulation pipe of error amplifier, this makes at dominant pole of the invention
In on the output end of error amplifier, and the dominant pole depends on the output impedance of error amplifier and the size of filter capacitor,
And the noise remove ability unrelated therefore of the invention with the load condition of voltage output end connection is not influenced by load variation.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing low noise low pressure difference linear voltage regulator；
Fig. 2 is schematic block circuit diagram of the invention；
Fig. 3 is the electrical block diagram (Serial regulation pipe is field-effect tube) of one embodiment of the present invention；
Fig. 4 is the electrical block diagram of another embodiment of the present invention (Serial regulation pipe is bipolar transistor)；
Fig. 5 is that (curve a is Serial regulation pipe of the invention when being field-effect tube for output noise power spectral curve of the invention
Output noise power spectral curve, the output noise power that curve b is Serial regulation pipe of the invention when being bipolar transistor
Spectral curve).
Specific embodiment
As shown in Figures 2 to 4, present invention discloses a kind of low noise low differential voltage linear voltage stabilizer circuit, including voltage are defeated
Enter to hold Vin, voltage output end Vout, biasing circuit 1, error amplifier EA, partial pressure feed circuit 2, Serial regulation pipe Q and filter
Wave capacitor C2；Being selected according to linear regulation pipe Q is field-effect tube or bipolar transistor, and the linear regulation pipe Q is connected into altogether
Drain electrode structure or common collector configuration；The wherein input terminal of voltage input end Vin connection Serial regulation pipe Q and biasing circuit 1
Input terminal, the non-inverting input terminal of the output end connection error amplifier EA of biasing circuit 1, the inverting input terminal of error amplifier EA
The output end of connection partial pressure feed circuit 2, output end connection one end filter capacitor C2 of error amplifier EA and Serial regulation pipe Q
Control terminal, filter capacitor C2 other end ground connection, the output end of voltage output end Vout connection Serial regulation pipe Q and partial pressure are fed back
The input terminal of circuit 2.Since linear regulation pipe Q connects into common drain structure or common collector configuration, and error amplifier EA
Output end connection the one end filter capacitor C2 and Serial regulation pipe Q control terminal, this makes a kind of low noise low voltage difference
The dominant pole of linear regulator circuit is on the output end of error amplifier EA, and the dominant pole determined by filter capacitor C2 and
The noise remove ability unrelated therefore of the invention with the load condition of voltage output end Vout connection be not by the shadow of load variation
It rings.
Specifically, the biasing circuit 1 includes reference voltage generating circuit 11 and RC low-pass filter circuit 12, reference voltage
The input terminal of generation circuit 11 is the input terminal of the biasing circuit 1, and the output end connection RC of reference voltage generating circuit 12 is low
The input terminal of bandpass filter circuit 12, the output end of RC low-pass filter circuit 12 are the output end of the biasing circuit 1；RC low pass filtered
Wave circuit 12 includes first resistor R1 and first capacitor C1, and the one end first resistor R1 is connected with the one end first capacitor C1, the first electricity
The input terminal that the R1 other end is RC low-pass filter circuit 12 is hindered, the common end of first resistor R1 and first capacitor C1 is RC low pass filtered
The output end of wave circuit 12, first capacitor C1 other end ground connection.
The partial pressure feed circuit 2 includes second resistance R2 and 3rd resistor R3, and the one end second resistance R2 is partial pressure feedback
The input terminal of circuit 2, the second resistance R2 other end are connected with the one end 3rd resistor R3,3rd resistor R3 other end ground connection, and second
The common end of resistance R2 and 3rd resistor R3 are the output end for dividing feed circuit 2.
A kind of main noise of low noise low differential voltage linear voltage stabilizer circuit shares at five: voltage input end Vin connects
Noise, the Serial regulation pipe Q that noise, the error amplifier EA of noise, the introducing of biasing circuit 1 that the input voltage entered introduces are introduced
The noise that the noise and partial pressure feed circuit 2 of introducing introduce.
The noise wherein introduced for the input voltage of voltage input end Vin access, can be using high PSRR
Reference voltage generating circuit 11 and error amplifier EA reduce the noise that the input voltage of voltage input end Vin access introduces.
Common drain structure or common collector configuration are connected into additionally, due to Serial regulation pipe Q, so that the output end of Serial regulation pipe Q is one
A low-impedance node can reduce the resistance value of the second resistance R2 and 3rd resistor R3 of partial pressure feed circuit 2 in proportion in this way,
To reduce the noise that partial pressure feed circuit 2 introduces.
Equivalent output noise S of the biasing circuit 1 in voltage output end Voutout1(s) are as follows:
Wherein β is the partial pressure coefficient for dividing feed circuit,R2It is the resistance value of second resistance R2, R3It is third
The resistance value of resistance R3；R1It is the resistance value of first resistor R1, C1It is the capacitance of first capacitor C1, AEAIt (s) is error amplifier EA
Gain, AQ(s) be Serial regulation pipe Q gain, Sint1(s) it is equivalent injection noise in 1 input terminal of biasing circuit.Biasing
Circuit 1 the equivalent output noise of voltage output end Vout transfer function be RC low-pass filter circuit transfer function and by
Divide the transmission of the closed control circuit of feed circuit 2, filter capacitor C2, Serial regulation pipe Q and error amplifier EA composition
The product of function；For the noise that biasing circuit 11 introduces, the positive open-loop gain of closed control circuit is error amplification
The product of the gain of the gain and Serial regulation pipe Q of device EA.
Equivalent output noise S of the error amplifier EA in voltage output end VoutoutEA(s) are as follows:
Wherein SintEA(s) it is equivalent injection noise in error amplifier EA input terminal.Error amplifier EA is defeated in voltage
The transfer function of the equivalent output noise of outlet Vout i.e. be by partial pressure feed circuit 2, filter capacitor C2, Serial regulation pipe Q with
And the product of the transfer function of the closed control circuit of error amplifier EA composition；For error amplifier EA introduce noise and
Speech, the positive open-loop gain of closed control circuit are the product of the gain of error amplifier EA and the gain of Serial regulation pipe Q.
Equivalent output noise S of the Serial regulation pipe Q in voltage output end VoutoutQ(s) are as follows:
Wherein SintQ(s) it is equivalent injection noise in Serial regulation pipe Q input terminal.Serial regulation pipe Q is in voltage output
Hold Vout equivalent output noise transfer function i.e. be by partial pressure feed circuit 2, filter capacitor C2, Serial regulation pipe Q and
The product of the transfer function of the closed control circuit of error amplifier EA composition；For the noise that Serial regulation pipe Q is introduced,
The positive open-loop gain of closed control circuit is 1.
Equivalent output noise S of the partial pressure feed circuit 2 in voltage output end Voutout2(s) are as follows:
Wherein Sint2It (s) is in the equivalent injection noise for dividing 2 input terminal of feed circuit.Feed circuit 2 is divided in voltage
The transfer function of the equivalent output noise of output end vo ut is by partial pressure feed circuit 2, filter capacitor C2, Serial regulation pipe Q
And the product of the transfer function of the closed control circuit of error amplifier EA composition；It makes an uproar for what partial pressure feed circuit 2 introduced
For sound, the positive open-loop gain of closed control circuit is 1.
The noise characteristic of the biasing circuit 1 and error amplifier EA are low pass, biasing circuit 1 and error amplifier EA master
Contribute to a kind of low frequency output noise of low noise low differential voltage linear voltage stabilizer circuit；Serial regulation pipe Q and partial pressure are anti-
The noise characteristic of current feed circuit 2 is high pass, and Serial regulation pipe Q is low with a kind of partial pressure 2 main contributions of feed circuit low noise
The high frequency output noise of pressure difference linear regulator circuit.
Cooperate shown in Fig. 3, in one embodiment of the present invention, the Serial regulation pipe Q is field-effect tube Q1, this effect
Should the drain electrode of pipe Q1 connect voltage input end Vin, the source electrode of field-effect tube Q1 connects voltage output end Vout, the field-effect tube
The input terminal of the grid connection error amplifier EA of Q1, such Serial regulation pipe Q just connect into common drain structure.
Cooperate shown in Fig. 4, in another embodiment of the present invention, the Serial regulation pipe Q is bipolar transistor Q2,
The collector of bipolar transistor Q2 connects voltage input end Vin, and the emitter connection voltage of bipolar transistor Q2 is defeated
The input terminal of the grid connection error amplifier EA of outlet Vout, bipolar transistor Q2, such bipolar transistor Q2 is just
Connect into common collector configuration.Cooperate Fig. 5 shown in, the Serial regulation pipe Q that compares be field-effect tube Q1 the case where, Serial regulation pipe
The case where Q is bipolar transistor Q2 can be reduced high-frequency noise.
Above-described embodiment and schema and non-limiting product form and style of the invention, any technical field it is common
The appropriate changes or modifications that technical staff does it all should be regarded as not departing from patent category of the invention.
Claims (4)
1. a kind of low noise low differential voltage linear voltage stabilizer circuit, it is characterised in that: including voltage input end, voltage output end, partially
Circuits, error amplifier, partial pressure feed circuit, Serial regulation pipe and filter capacitor；The linear regulation pipe connects into altogether
Drain electrode structure or common collector configuration；Voltage input end connects the input terminal of Serial regulation pipe and the input terminal of biasing circuit, partially
The non-inverting input terminal of the output end connection error amplifier of circuits, the inverting input terminal connection partial pressure feedback electricity of error amplifier
The output end on road, the control terminal of output end connection filter capacitor one end and Serial regulation pipe of error amplifier, filter capacitor are another
One end ground connection, voltage output end connect the output end of Serial regulation pipe and the input terminal of partial pressure feed circuit.
2. a kind of low noise low differential voltage linear voltage stabilizer circuit as described in claim 1, it is characterised in that: the Serial regulation
Pipe is bipolar transistor, and the collector of the bipolar transistor connects voltage input end, the emitter of the bipolar transistor
Connect voltage output end, the output end of the base stage connection error amplifier of the bipolar transistor.
3. a kind of low noise low differential voltage linear voltage stabilizer circuit as claimed in claim 1 or 2, it is characterised in that: the biasing
Circuit includes reference voltage generating circuit and RC low-pass filter circuit, and the input terminal of reference voltage generating circuit is the biased electrical
The input terminal on road, the input terminal of the output end connection RC low-pass filter circuit of reference voltage generating circuit, RC low-pass filter circuit
Output end be the biasing circuit output end.
4. a kind of low noise low differential voltage linear voltage stabilizer circuit as claimed in claim 3, it is characterised in that: the RC low pass filtered
Wave circuit includes first resistor and first capacitor, and first resistor one end is connected with first capacitor one end, and the first resistor other end is
The common end of the input terminal of RC low-pass filter circuit, first resistor and first capacitor is the output end of RC low-pass filter circuit, the
One capacitor other end ground connection.
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| CN201910227846.1A CN109947168A (en) | 2019-03-25 | 2019-03-25 | A kind of low noise low differential voltage linear voltage stabilizer circuit |
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| CN201910227846.1A CN109947168A (en) | 2019-03-25 | 2019-03-25 | A kind of low noise low differential voltage linear voltage stabilizer circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112560383A (en) * | 2019-09-10 | 2021-03-26 | 圣邦微电子（北京）股份有限公司 | LDO circuit layout |
| CN112650348A (en) * | 2020-12-31 | 2021-04-13 | 成都瓴科微电子有限责任公司 | Low dropout regulator |
| CN114006348A (en) * | 2021-12-06 | 2022-02-01 | 之江实验室 | Single-row carrier photoelectric detector bias voltage protection circuit |
| CN117055671A (en) * | 2023-07-26 | 2023-11-14 | 无锡前诺德半导体有限公司 | Low-dropout voltage regulator |
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