CN106055507A - BMC signal sending device for USB PD communication - Google Patents
BMC signal sending device for USB PD communication Download PDFInfo
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- CN106055507A CN106055507A CN201610613737.XA CN201610613737A CN106055507A CN 106055507 A CN106055507 A CN 106055507A CN 201610613737 A CN201610613737 A CN 201610613737A CN 106055507 A CN106055507 A CN 106055507A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
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- H03K19/017509—Interface arrangements
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Abstract
The invention discloses a BMC signal sending device for USB PD communication. The device comprises a signal amplitude setting module, a conversion rate control module, a voltage-current conversion module and a sending driving module which are connected in sequence. The signal amplitude setting module is used for setting the voltage amplitude of a BMC sending signal and generating a first voltage signal; the conversion speed control module is used for controlling the high-low level conversion speed of the first voltage signal and generating a second voltage signal with the amplitude same as that of the first voltage signal and the conversion speed different from that of the first voltage signal; the voltage-current conversion module is used for converting the second voltage signal into a current signal; the sending driving module is used for converting the current signal into a BMC sending signal and transmitting the BMC sending signal to a CC line. The BMC signal sending device conforming to USB PD and USB Type-C protocol specifications is provided for USB PD communication of electronic equipment with a USB Type-C interface, the device is low in design technology limit and flexible and easy to debug; in addition, the device can be integrated to a silicon wafer easily, no any off-chip element is needed, and therefore the device has the good market application value.
Description
Technical field
The present invention relates to USB power supply technique field and serial communication technology field, be specifically related to a kind of USB PD communication
BMC sender unit.
Background technology
Along with the development of electronic technology, USB interface role in the electronic device also there occurs differentiation.USB interface is in birth
At the raw initial stage, it is transmitted as major function with data, subsidiary extremely limited power supply capacity.But now, the electric energy of USB transmits and goes up
It is raised to the status of equal importance with data transmission.USB is increasingly becoming a standard configuration interface of electronic equipment.Every day, number with
The portable type electronic product of hundred million meters, MP3 player, smart mobile phone, panel computer and Intelligent worn device etc., pass through USB interface
Obtain electric energy.
USB BC 1.2 is developed into from USB 1.0, the power supply capacity of USB interface, also rise to 5V/ from 5V/500mA
1.5A, meets the power demands of many portable type electronic products.While it is true, the electronics still having much power slightly larger sets
Standby, such as notebook computer, PC LCDs etc., it is impossible to acquired the enough power maintaining its work by USB interface.This
Outward, part has the scientific and technical personnel of industry foresight, it is desirable to substitute other power supply interfaces in electronic equipment by USB interface so that produce
The integrated level of product is higher, and cost is lower, moreover it is possible to optimizes whole electronic industry ecosphere, reduces various supplying adapter and power transmission line
The waste of cable.Then, the USB PD agreement supporting greater power transmission is arisen at the historic moment.USB PD supports multiple voltage set of currents
State, maximum can be supported that the power of 100W (20V/5A) transmits, support power supply role switching simultaneously so that sizable part electricity
Subset is included again inside the ecosphere that USB powers.
Traditional USB interface (Type-A and Type-B) uses BFSK's (Binary Frequency Shift Keyed)
Mode, is injected into information on VBUS by carrier frequency modulation, it is achieved the mutual association between USB PD feeder ear and receiving end
Business.This communication means, using power line as signal transmission passage, needs AC coupling and impedance to isolate, and cost is high, it is achieved difficulty
Greatly so that it is be difficult to be promoted on a large scale.In novel USB Type-C interface, there is CC line as special plug inspection
Survey and USB PD communication path.BMC (the Biphase Mark Coding) signal that carry USB PD information is loaded directly at CC
Transmit on line.The method simple and flexible, is expected to be widely used in the near future.
Summary of the invention
Based on the deficiencies in the prior art, the present invention is the USB PD communication of the electronic equipment having USB Type-C interface,
Provide a kind of BMC sender unit meeting USB PD and USB Type-C protocol specification.
For achieving the above object, the technical scheme is that
The BMC sender unit of a kind of USB PD communication, arranges module, conversion speed including the signal amplitude being sequentially connected with
Rate control module, Voltage-current conversion module and transmission drive module；
Described signal amplitude arranges module, sends the voltage amplitude of signal for arranging BMC, generates the first voltage signal；
Described conversion rate control module, for controlling the switching rate of described first voltage signal low and high level
System, generates and described the second voltage signal that first voltage signal amplitude is identical, switching rate is different；
Described Voltage-current conversion module, for being converted to current signal by the second voltage signal；
Described transmission drives module, sends signal for current signal is converted to BMC and is sent to CC line.
The voltage amplitude of described first voltage signal is 1.125V, it is allowed to deviation be ± 75mV.
The switching rate of described first voltage signal low and high level is controlled by described conversion rate control module so that
Signal rising and falling time is all not less than 300ns.
Described signal amplitude arranges the circuit of module and conversion rate control module and includes forming the first of negative feedback loop
Amplifier, the first NMOS tube, the first resistance, the second resistance, the first electric capacity, the first PMOS, the second PMOS, the 3rd PMOS
Pipe, the second NMOS tube, the 3rd NMOS tube, the first switch, second switch and the second electric capacity, described first amplifier positive terminal connects
Relative to the external reference voltage vref on ground, the grid of outfan and the first NMOS tube is connected, and the drain electrode of the first NMOS tube connects
Power supply, source series the second resistance and the first resistance, the first resistance other end ground connection, described first amplifier negative phase end is even
Being connected on the line between the first resistance and the second resistance, described first electric capacity the first end connects the first amplifier out, institute
State first electric capacity the second end ground connection, the source electrode of described first PMOS, the source electrode of described second PMOS and described 3rd PMOS
The sources connected in parallel of pipe is at the source terminal of described first NMOS tube, the grid of described first PMOS and drain electrode, described 2nd PMOS
The grid of pipe and the grid of described 3rd PMOS connect same external biasing current ibias, the drain electrode of described second PMOS
Connecting the drain and gate of the second NMOS tube, the grid of described second NMOS tube connects the grid of described 3rd NMOS tube, described
The drain electrode of the 3rd PMOS connects the drain electrode of the 3rd NMOS tube, described second electric capacity by the first switch of series connection and second switch
Forming, with second switch and the 3rd NMOS tube, the circuit in parallel connected, the source electrode of described second NMOS tube and the 3rd NMOS tube connects
Ground, the control signal of described first switch and second switch is respectively BMC digital signal (data) and its inversion signal
Described Voltage-current conversion module and sending drive the circuit of module include the second amplifier, the 4th PMOS, the
Four NMOS tube, the 3rd resistance, the 3rd electric capacity, the 5th PMOS, the 5th NMOS tube and the 4th resistance, described second amplifier is just
End is connected on the line of the first switch and second switch mutually, and the outfan of described amplifier connects the 4th NMOS tube grid, institute
Stating the 4th NMOS tube source series the 3rd resistance, the other end ground connection of described 3rd resistance, the 4th NMOS tube drain electrode connects the 4th
PMOS drain and gate, the 4th PMOS source electrode connects power supply, and described second amplifier negative phase end connects the 4th NMOS tube source
Pole, described second amplifier out is also associated with the 3rd electric capacity the first end, the 3rd electric capacity the second end ground connection, described 4th PMOS
Pipe grid connect the 5th PMOS grid, and the 5th PMOS source electrode connects power supply, and drain electrode connects described 4th resistance, described 4th electricity
The other end of resistance connects the 5th NMOS tube drain electrode, described 5th NMOS tube source ground, described 5th PMOS drain electrode and CC line
It is connected.
Described signal amplitude arranges the circuit of module and conversion rate control module and includes the 3rd amplifier, the 6th PMOS
Pipe, the 7th PMOS, the 8th PMOS, the 9th PMOS, the 6th NMOS tube, the 7th NMOS tube, the 4th electric capacity, the 5th electric capacity,
5th resistance, the 6th resistance, the 3rd switch and the 4th switch, described 3rd amplifier positive terminal connects the outside relative to power supply
Reference voltage vdd-vref, outfan connects the 6th PMOS grid, and described 6th PMOS source electrode is sequentially connected in series the 6th resistance
With the 5th resistance, the 5th resistance other end connects power supply, described 6th PMOS grounded drain, described 3rd amplifier negative phase end
Being connected on the connecting line of the 5th resistance and the 6th resistance, the outfan of described 3rd amplifier is also connected with the 4th electric capacity first
End, described 4th electric capacity another terminate described power supply, described 7th PMOS source electrode, described 8th PMOS source electrode and described the
Nine PMOS source electrodes connect described power supplys, described 7th PMOS drain and gate, described 8th PMOS grid and described the
Nine PMOS grids connect external biasing current ibias, and described 8th PMOS drain electrode connects the 6th NMOS tube drain electrode, and described the
Six NMOS tube drain electrodes connect the 6th PMOS grids, and described 6th NMOS tube grid is also connected with the 7th NMOS tube grid, and described the
Seven NMOS tube source electrodes connect the 6th NMOS tube source electrode and the 6th PMOS source electrodes, described 7th NMOS tube drain electrode by series connection the
Three switches and the 4th switch connect the 9th PMOS drain electrode, and described 5th electric capacity is connected in parallel on described 9th PMOS source electrode and the 3rd
Between the line of switch and the 4th switch, the control signal of described 4th switch and the 3rd switch is respectively BMC digital signal
Data and its inversion signal
Described Voltage-current conversion module and sending drive the circuit of module include the 4th amplifier, the tenth PMOS, the
Eight NMOS tube, the 7th resistance, the 8th resistance and the 6th electric capacity, described 4th amplifier positive terminal be connected to described 3rd switch and
On the connecting line of described 4th switch, the outfan of described 4th amplifier connects the tenth PMOS grid, described tenth PMOS
Pipe drain series the 8th resistance, the other end of described 8th resistance connects the 8th NMOS tube drain electrode, described 8th NMOS tube source electrode
Ground connection, described tenth PMOS source series the 7th resistance, the 7th resistance other end connects power supply, described 4th amplifier negative
End connect the tenth PMOS source electrode, the outfan of described 4th amplifier is also connected with the 6th electric capacity the first end, the 6th electric capacity another
End connects power supply, and described tenth PMOS drain electrode is connected with CC line.
The invention have the benefit that the USB PD communication that the present invention is the electronic equipment having USB Type-C interface,
Thering is provided a kind of BMC sender unit meeting USB PD and USB Type-C protocol specification, this device designing technique threshold is low,
Debugging is the simplest, additionally, this device is prone to integrated on silicon chip, it is not necessary to any off-chip components and parts, thus makes it have good
Market using value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the specific embodiment of the invention；
Fig. 2 is that the signal amplitude of the first specific embodiment of the present invention arranges module and conversion rate control modular circuit knot
Structure schematic diagram；
Fig. 3 is the Voltage-current conversion module of the first specific embodiment of the present invention and sends driving modular circuit structure
Schematic diagram；
Fig. 4 is that the signal amplitude of the second specific embodiment of the present invention arranges module and conversion rate control modular circuit knot
Structure schematic diagram；
Fig. 5 is the Voltage-current conversion module of the second specific embodiment of the present invention and sends driving modular circuit structure
Schematic diagram.
Detailed description of the invention
Below with reference to embodiment and accompanying drawing, the technique effect of design, concrete structure and the generation of the present invention is carried out clearly
Chu, it is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this
Bright a part of embodiment rather than all embodiment, based on embodiments of the invention, those skilled in the art is not paying
Other embodiments obtained on the premise of creative work, belong to the scope of protection of the invention.
As it is shown in figure 1, the BMC sender unit of a kind of USB PD communication, arrange including the signal amplitude being sequentially connected with
Module, conversion rate control module, Voltage-current conversion module and transmission drive module；
Signal amplitude arranges module, sends the voltage amplitude of signal for arranging BMC, generates the first voltage signal；
Conversion rate control module, for the switching rate of described first voltage signal low and high level is controlled, raw
Become and described the second voltage signal that first voltage signal amplitude is identical, switching rate is different；
Voltage-current conversion module, for being converted to current signal by the second voltage signal；
Send and drive module, send signal for current signal is converted to BMC and is sent to CC line.
The voltage amplitude of the first voltage signal is 1.125V, it is allowed to deviation be ± 75mV.
The switching rate of the first voltage signal low and high level is controlled by conversion rate control module so that signal rises
300ns all it is not less than with fall time.
Specific embodiment one: as in figure 2 it is shown, the circuit that signal amplitude arranges module and conversion rate control module includes group
Become the first amplifier OP1 of negative feedback loop, the first NMOS tube NM1, the first resistance R1, the second resistance R2, the first electric capacity C1, the
One PMOS PM1, the second PMOS PM2, the 3rd PMOS PM3, the second NMOS tube NM2, the 3rd NMOS tube NM3, the first switch
S1, second switch S2 and the second electric capacity C2, OP1 positive terminal connects external reference voltage vref, the grid phase of outfan and NM1
Even, the drain electrode of NM1 connects power supply, source series R2 and R1, R1 other end ground connection, OP1 negative phase end be connected to R1 and R2 it
Between line on, C1 the first end connect OP1 outfan, C1 the second end ground connection, the source electrode of PM1, the source electrode of PM2 and the source electrode of PM3
Being connected in parallel on the source terminal of NM1, the grid of the grid of PM1 and drain electrode, the grid of PM2 and PM3 connects same external biasing current
The drain electrode of ibias, PM2 connects the drain and gate of NM2, and the grid of NM2 connects the grid of NM3, and the drain electrode of PM3 is by series connection
The drain electrode of S1 and S2 connection NM3, the circuit in parallel that C2 with S2 and NM3 composition is connected, the source ground of NM2 and NM3, S1's and S2
Control signal is respectively BMC digital signal data and its inversion signal
On the left of dotted line, circuit sends the voltage amplitude vswing of signal for producing BMC.First amplifier OP 1, first
NMOS tube NM1, the first resistance R1 and the second resistance R2 constitute feedback loop so that the voltage of A point is vref.Then B point
VoltageFirst electric capacity C1 is for the frequency compensation of feedback loop.Circuit on the right side of dotted line is real
Existing BMC sends the control of signal switching rate.Wherein the first PMOS PM1, the second PMOS PM2 and the 3rd PMOS PM3 structure
Becoming a current mirror, NM2 and NM3 constitutes another current mirror.First switch S1 and second switch S2 is respectively by BMC digital signal
Data and inversion signal thereofControl conducting and disconnect.The electric current of PM3 and NM3, and the appearance of electric capacity C2 is flowed through by adjustment
Value, can control the switching rate of vslew signal.
As it is shown on figure 3, the Voltage-current conversion module of embodiment one and transmission drive the circuit of module to include the second amplification
Device OP2, the 4th PMOS PM4, the 4th NMOS tube NM4, the 3rd resistance R3, the 3rd electric capacity C3, the 5th PMOS PM5, the 5th
NMOS tube NM5 and the 4th resistance R4, the positive terminal of OP2 is connected to the first switch S1 and company of second switch S2 as shown in Figure 2
On line, the outfan of OP2 connects NM4 grid, the other end ground connection of NM4 source series R3, R3, NM4 drain electrode connect PM4 drain electrode and
Grid, PM4 source electrode connects power supply, and OP2 negative phase end connects NM4 source electrode, and OP2 outfan is also connected with C3 the first end, and C3 second terminates
Ground, PM4 grid connects PM5 grid, and PM5 source electrode connects power supply, and PM5 drain electrode connects the other end of R4, R4 and connects NM5 drain electrode, NM5
Source ground, PM5 drain electrode is connected with CC line.
The conversion of circuit realiration voltage-to-current on the left of dotted line, OP2, NM4 and R3 constitute feedback loop so that the electricity of C point
Pressure follows vslew change.Then, the electric current flowing through PM4 isPM4 and PM5 forms the mirror image of 1:N, R simultaneously3=
NR4, then electric current I2=NI1.R4 resistance choose the requirement needing to meet Impedance Matching on Transmission Line, USB PD agreement regulation
Scope is 33～75 Ω.NM5 is switching tube, is off state when this device does not send BMC signal, thus does not affect CC line
On plug detection and the reception of BMC signal sent to other equipment.
Specific embodiment two: as shown in Figure 4, signal amplitude arranges the circuit of module and conversion rate control module and includes
Three amplifier OP3, the 6th PMOS PM6, the 7th PMOS PM7, the 8th PMOS PM8, the 9th PMOS PM9, the 6th NMOS
Pipe NM6, the 7th NMOS tube NM7, the 4th electric capacity C4, the 5th electric capacity C5, the 5th resistance R5, the 6th resistance R6, the 3rd switch S3 and
4th switch S4, OP3 positive terminal connects the external reference voltage vdd-vref relative to power supply, and outfan connects PM6 grid,
PM6 source electrode is sequentially connected in series R6 and R5, the R5 other end and connects power supply, and PM6 grounded drain, OP3 negative phase end is connected to the company of R5 and R6
In wiring, the outfan of OP3 is also connected with C4 the first end, another termination power of C4, and PM7 source electrode, PM8 source electrode and PM9 source electrode connect
Power supply, PM7 drain and gate, PM8 grid and connection external biasing current ibias, the PM8 drain electrode connection NM6 drain electrode of PM9 grid,
NM6 drain electrode connects PM6 grid, and NM6 grid is also connected with NM7 grid, and NM7 source electrode connects NM6 source electrode and PM6 source electrode, and NM7 drain electrode is logical
S3 and S4 crossing series connection connects PM9 drain electrode, and C5 is connected in parallel between PM9 source electrode and the line of S3 and S4, the control signal of S4 and S3
It is respectively BMC digital signal data and its inversion signal
On the left of dotted line, circuit sends the voltage amplitude vswing of signal for producing BMC.OP3, PM6, R5 and R6 constitute negative
Feedback control loop so that the voltage of A point is vdd-vref.Then the voltage of B point is vdd-vswing, whereinCircuit realiration BMC on the right side of dotted line sends the control of signal switching rate.Wherein PM7, PM8
Constituting a current mirror with PM9, NM6 and NM7 constitutes another current mirror.Switch S4 and S3 is respectively by BMC digital signal data
And its inversion signalControl conducting and disconnect.The electric current of PM9 and NM7, and the capacitance of electric capacity C5 is flowed through by adjustment,
The switching rate of vdd-vslew signal can be controlled.
As it is shown in figure 5, the Voltage-current conversion module of specific embodiment two and transmission drive the circuit of module to include the 4th
Amplifier OP4, the tenth PMOS PM10, the 8th NMOS tube NM8, the 7th resistance R7, the 8th resistance R8 and the 6th electric capacity C6, OP4
Positive terminal is connected on the connecting line of S3 and S4, and the outfan of OP4 connects PM10 grid, another of PM10 drain series R8, R8
End connects NM8 drain electrode, NM8 source ground, PM10 source series R7, and the R7 other end connects power supply, and OP4 negative phase end connects PM10 source
Pole, the outfan of OP4 is also connected with C6 the first end, and the C6 other end connects power supply, and PM10 drain electrode is connected with CC line.
OP4, PM10 and R7 constitute feedback loop so that the voltage follow vdd-vslew change of C point.Then, R7 is flowed through
Electric current beR7=R8, its resistance choose the requirement needing to meet Impedance Matching on Transmission Line.NM8 is switch
Pipe, is off state, thus does not affect the plug detection on CC line and set other when this device does not send BMC signal
The reception of standby sent BMC signal.
It should be noted that the above is presently preferred embodiments of the present invention, the invention is not limited in above-mentioned
Embodiment, as long as it reaches the technique effect of the present invention with identical means, all should belong to protection scope of the present invention.
Claims (7)
1. the BMC sender unit of a USB PD communication, it is characterised in that: include that the signal amplitude being sequentially connected with arranges mould
Block, conversion rate control module, Voltage-current conversion module and transmission drive module；
Described signal amplitude arranges module, sends the voltage amplitude of signal for arranging BMC, generates the first voltage signal；
Described conversion rate control module, for the switching rate of described first voltage signal low and high level is controlled, raw
Become and described the second voltage signal that first voltage signal amplitude is identical, switching rate is different；
Described Voltage-current conversion module, for being converted to current signal by the second voltage signal；
Described transmission drives module, sends signal for current signal is converted to BMC and is sent to CC line.
2. the BMC sender unit of USB PD communication as claimed in claim 1, it is characterised in that: described first voltage letter
Number voltage amplitude be 1.125V, it is allowed to deviation be ± 75mV.
3. the BMC sender unit of USB PD communication as claimed in claim 1, it is characterised in that: described switching rate control
The switching rate of described first voltage signal low and high level is controlled by molding block so that signal rising and falling time is the most not
Less than 300ns.
4. the BMC sender unit of USB PD communication as claimed in claim 1, it is characterised in that: described signal amplitude sets
Put the circuit of module and conversion rate control module include forming the first amplifier of negative feedback loop, the first NMOS tube, first
Resistance, the second resistance, the first electric capacity, the first PMOS, the second PMOS, the 3rd PMOS, the second NMOS tube, the 3rd NMOS
Pipe, the first switch, second switch and the second electric capacity, described first amplifier positive terminal connects the external reference voltage relative to ground
Vref, the grid of outfan and the first NMOS tube is connected, and the drain electrode of the first NMOS tube connects power supply, source series the second electricity
Resistance and the first resistance, the first resistance other end ground connection, described first amplifier negative phase end is connected to the first resistance and the second resistance
Between line on, described first electric capacity the first end connects the first amplifier out, described first electric capacity the second end ground connection, institute
State the sources connected in parallel of the source electrode of the first PMOS, the source electrode of described second PMOS and described 3rd PMOS described first
The source terminal of NMOS tube, the grid of described first PMOS and drain electrode, the grid of described second PMOS and described 3rd PMOS
The grid of pipe connects same external biasing current ibias, the drain electrode of described second PMOS connect the second NMOS tube drain electrode and
Grid, the grid of described second NMOS tube connects the grid of described 3rd NMOS tube, and the drain electrode of described 3rd PMOS is by string
First switch of connection and second switch connect the drain electrode of the 3rd NMOS tube, described second electric capacity and second switch and the 3rd NMOS tube
The circuit in parallel of composition series connection, described second NMOS tube and the source ground of the 3rd NMOS tube, described first switch and second is opened
The control signal closed is respectively BMC digital signal (data) and its inversion signal
5. the BMC sender unit of USB PD communication as claimed in claim 4, it is characterised in that: described voltage-to-current turns
Die change block and send drive module circuit include the second amplifier, the 4th PMOS, the 4th NMOS tube, the 3rd resistance, the 3rd
Electric capacity, the 5th PMOS, the 5th NMOS tube and the 4th resistance, the positive terminal of described second amplifier is connected to the first switch and
On the lines of two switches, the outfan of described amplifier connects the 4th NMOS tube grid, described 4th NMOS tube source series the
Three resistance, the other end ground connection of described 3rd resistance, the 4th NMOS tube drain electrode connection the 4th PMOS drain and gate, the 4th
PMOS source electrode connects power supply, and described second amplifier negative phase end connects the 4th NMOS tube source electrode, described second amplifier output
End is also associated with the 3rd electric capacity the first end, the 3rd electric capacity the second end ground connection, and described 4th gate pmos connects the 5th gate pmos
Pole, the 5th PMOS source electrode connects power supply, and drain electrode connects described 4th resistance, and the other end of described 4th resistance connects the 5th
NMOS tube drains, described 5th NMOS tube source ground, and described 5th PMOS drain electrode is connected with CC line.
6. the BMC sender unit of USB PD communication as claimed in claim 1, it is characterised in that: described signal amplitude sets
The circuit putting module and conversion rate control module includes the 3rd amplifier, the 6th PMOS, the 7th PMOS, the 8th PMOS
Pipe, the 9th PMOS, the 6th NMOS tube, the 7th NMOS tube, the 4th electric capacity, the 5th electric capacity, the 5th resistance, the 6th resistance, the 3rd
Switch and the 4th switch, described 3rd amplifier positive terminal connects the external reference voltage vdd-vref relative to power supply, output
End connects the 6th PMOS grid, and described 6th PMOS source electrode is sequentially connected in series the 6th resistance and the 5th resistance, and the 5th resistance is another
One end connects power supply, and described 6th PMOS grounded drain, described 3rd amplifier negative phase end is connected to the 5th resistance and the 6th
On the connecting line of resistance, the outfan of described 3rd amplifier is also connected with the 4th electric capacity the first end, the described 4th electric capacity other end
Connecing described power supply, described 7th PMOS source electrode, described 8th PMOS source electrode and described 9th PMOS source electrode connect described
Power supply, described 7th PMOS drain and gate, described 8th PMOS grid and described 9th PMOS grid connect outside
Bias current ibias, described 8th PMOS drain electrode connects the 6th NMOS tube drain electrode, and described 6th NMOS tube drain electrode connects the 6th
PMOS grid, described 6th NMOS tube grid is also connected with the 7th NMOS tube grid, and described 7th NMOS tube source electrode connects the 6th
NMOS tube source electrode and the 6th PMOS source electrode, described 7th NMOS tube drain electrode is connected by the 3rd switch and the 4th switch of series connection
9th PMOS drain electrode, described 5th electric capacity is connected in parallel on described 9th PMOS source electrode and the 3rd switch and the line of the 4th switch
Between, the control signal of described 4th switch and the 3rd switch is respectively BMC digital signal (data) and its inversion signal
7. the BMC sender unit of USB PD communication as claimed in claim 6, it is characterised in that: described voltage-to-current turns
Die change block and send drive module circuit include the 4th amplifier, the tenth PMOS, the 8th NMOS tube, the 7th resistance, the 8th
Resistance and the 6th electric capacity, described 4th amplifier positive terminal is connected to described 3rd switch and the connecting line of described 4th switch
On, the outfan of described 4th amplifier connects the tenth PMOS grid, described tenth PMOS drain series the 8th resistance, institute
The other end stating the 8th resistance connects the 8th NMOS tube drain electrode, described 8th NMOS tube source ground, described tenth PMOS source
Pole series connection the 7th resistance, the 7th resistance other end connects power supply, and described 4th amplifier negative phase end connects the tenth PMOS source electrode,
The outfan of described 4th amplifier is also connected with the 6th electric capacity the first end, and the 6th electric capacity other end connects power supply, and the described tenth
PMOS drain electrode is connected with CC line.
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