CN105760331B - A kind of transmitter being applied in USB-PD communications - Google Patents
A kind of transmitter being applied in USB-PD communications Download PDFInfo
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- CN105760331B CN105760331B CN201610097106.7A CN201610097106A CN105760331B CN 105760331 B CN105760331 B CN 105760331B CN 201610097106 A CN201610097106 A CN 201610097106A CN 105760331 B CN105760331 B CN 105760331B
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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
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Abstract
The present invention relates to the transmitter in a kind of PD communications applied to USB, which includes：OTA circuits, amplifier, prime amplifier and control logic unit；Wherein, the positive input terminal of OTA circuits and negative input end are connected with control logic unit, and output and one end of the negative input end of control logic unit, the positive input terminal of amplifier and capacitance C1 are connected, the other end ground connection of capacitance C1；The one end for the output end and capacitance C1 that amplifier positive input terminal connects OTA circuits is connected, and negative input end links together with itself output；Prime amplifier positive input terminal is grounded, and the output end of negative input end connection OTA circuits, one end of output connection control logic unit；Control logic unit first end connects the output end of prime amplifier, and second end connects the input terminal of OTA circuits, and third end connects the output end of OTA circuits, and the 4th end connects reference voltage；OTA circuits pass through control logic unit so that OTA circuits are operated in amplifier and comparator state.
Description
Technical field
The present invention relates to USB circuit design fields, more particularly, to the transmitter in a kind of communication applied to USB-PD.
Background technology
Current various adapter standards are different, apply very cumbersome.USB-PD is the electricity with USB Type-C interfaces
Sub- equipment quick charge carries out the communication protocol of capacity of power negotiation, is encoded using BMC by CC lines in communication.USB-PD is
Power transmission is redesigned, and is brought for user and is provided more intrepid electric power output intent option, general communication process is as follows：
1, adapter and electrical appliance after a connection setup, can be broadcasted by CC lines, tell an other side for connection, be fitted
Orchestration is capable of providing how many kinds of voltage and corresponding electric current.
2, electrical appliance therefrom selects a most suitable power supply mode after learning the power supply capacity of adapter,
And send request data package to adapter.
3, adapter is according to the selection of electrical appliance, after the ability for assessing itself, sends " receivings " and orders.
4, adapter carries out builtin voltage transformation, and sends " power supply is ready to " data packet to electrical appliance.
5, adapter applies the new supply voltage after negotiating to VBUS.
And during this communication, the signal quality of transmission is clearly required according to USB-PD agreements, output is high
Level voltage range (1.04-1.2) V exports low level voltage range (0-75) mv, and rising edge and failing edge time are at least
300ns, rising edge and failing edge maximum time cannot violate eye pattern rule.
Invention content
The purpose of the application is that USB Type-C interfaces are that the currently various adapter standards that solve are different, are applied
Very cumbersome problem, and the present invention provides the transmitter circuit frameworks in a kind of PD communications applied to USB Type-C.
To achieve the goals above, this application provides the transmitter in a kind of communication applied to USB-PD, the transmitters
Including：Operational transconductance amplifier (Operational transconductance amplifier, abbreviation OTA) circuit, amplification
Device, prime amplifier and control logic unit；Wherein, the positive input terminal of OTA circuits and negative input end are connected with control logic unit,
It is exported is connected with one end of the negative input end of control logic unit, the positive input terminal of amplifier and capacitance C1, capacitance C1's
The other end is grounded；The one end for the output end and capacitance C1 that amplifier positive input terminal connects OTA circuits is connected, negative input end
It links together with itself output；Prime amplifier positive input terminal is grounded, and the output end of negative input end connection OTA circuits, defeated
Go out to connect one end of control logic unit；Control logic unit first end connects the output end of prime amplifier, and second end connects OTA
The input terminal of circuit, third end connect the output end of OTA circuits, and the 4th end connects reference voltage；OTA circuits pass through control logic
Unit so that OTA circuits are operated in amplifier and comparator state, its output waveform is made to disclosure satisfy that in USB-PD communication protocols
High level and low level and rising edge and failing edge time requirement.
As a kind of improvement of the embodiment of the present application, control logic unit includes：Switch S1, S2, S3, S4 are controlled, wherein
The one end S1 connects the positive output end of prime amplifier, the positive input terminal of the other end connection OTA circuits of S1 and one end of S4；S2
One end connects the negative output of prime amplifier, the negative input end of the other end connection OTA circuits of S2；One end of S3 connects OTA circuits
Negative input end, S3 the other end connection OTA circuits output end；The one end S4 connects reference voltage, and the other end of S4 connects OTA
The positive input terminal of circuit and the other end of S1；Control logic unit is in transmission BMC code systems signal " 1 ", " 0 ", by beating
Different control switches is opened, OTA circuits are used as amplifier or comparator.
As a kind of improvement of the embodiment of the present application, OTA circuits use the amplifier of folded cascode configuration.
As a kind of improvement of the embodiment of the present application, amplifier uses class ab ammplifier.
As a kind of improvement of the embodiment of the present application, amplifier is connected into the form of unit gain negative-feedback, in this way can be with
The signal of the positive input terminal of track amplifier, and amplifier amplifier can ensure smaller quiescent current, larger driving capability.
As a kind of improvement of the embodiment of the present application, prime amplifier is fully differential output form, to ensure OTA circuits defeated
When going out " 0 ", there are enough pressure differences to input.
As a kind of improvement of the embodiment of the present application, prime amplifier is fully differential output form comprising current source I1, the
One PMOS tube P1, the second PMOS tube P2, resistance R1 and resistance R2；Wherein the one end current source I1 connects power vd D, one end connection
The source electrode of P1, P2；The drain terminal of P1, P2 are separately connected one end of resistance R1, resistance R2, the grid of P1, P2 be separately connected two it is defeated
Enter end；Resistance R1, resistance R2 the other end connection with reference to " "；Its output end connects one end of S1, S2.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of transmitter circuit schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the OTA circuit diagrams of transmitter shown in Fig. 1；
Fig. 3 is the preamplifier circuit schematic diagram of transmitter shown in Fig. 1；
Fig. 4 is the signal control schematic diagram of transmitter shown in Fig. 1.
Specific implementation mode
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Fig. 1 is a kind of transmitter circuit schematic diagram provided in an embodiment of the present invention.As shown in Figure 1, the transmitter includes：
OTA circuits 001, amplifier 002, prime amplifier 003 and control logic unit 004.
The positive input terminal and negative input end of OTA circuits 001 are connected with control logic unit 004, output and control logic
One end of the negative input end of unit 004, the positive input terminal of amplifier 002 and capacitance C1 is connected, another termination of capacitance C1
Ground；The one end for the output end and capacitance C1 that 002 positive input terminal of amplifier connects OTA circuits 001 is connected, negative input end with
Itself output links together；003 positive input terminal of prime amplifier is grounded, and the output end of negative input end connection OTA circuits 001,
It exports one end of connection control logic unit 004.004 first end of control logic unit connects the output end of prime amplifier 003,
Second end connects the input terminal of OTA circuits 001, and third end connects the output end of OTA circuits 001, and the 4th end connects reference voltage
VREF.OTA circuits 001 pass through control logic unit 004 so that OTA circuits 001 are operated in amplifier and comparator state, make
Its output waveform disclosure satisfy that high level in USB-PD communication protocols and low level and the time of rising edge and failing edge are wanted
It asks.
OTA circuits 001 use the amplifier (as shown in Figure 2) of folded cascode configuration, amplifier 002 to be connected into unit increasing
The form of beneficial negative-feedback can track the signal of the positive input terminal of amplifier 002 in this way, and 002 amplifier of amplifier can ensure
Smaller quiescent current, larger driving capability.
Amplifier 002 uses class ab ammplifier, and positive input terminal connects the output of OTA circuits 001, negative input end with from
Body output links together, and entire class ab ammplifier is connected into the form of unit gain negative-feedback.
Prime amplifier 003 is fully differential output form (as shown in Figure 3) comprising current source I1, the first PMOS tube P1, the
Two PMOS tube P2, resistance R1 and resistance R2；Wherein the one end current source I1 connects power vd D, and one end connects the source electrode of P1, P2；P1、
The drain terminal of P2 is separately connected one end of resistance R1, resistance R2, and the grid of P1, P2 are separately connected two input terminals；Resistance R1, resistance
R2 the other end connection with reference to " "；Its output end connects one end of S1, S2.Prime amplifier 003 is fully differential output form, with
Ensure that OTA circuits 001 at output " 0 ", there are enough pressure differences to input.
Control logic unit 004 includes：Control switch S1, S2, S3, S4, the wherein one end S1 connection prime amplifier 003 just
Output end, the positive input terminal of the other end connection OTA circuits 001 of S1 and one end of S4；The one end S2 connects prime amplifier 003
Negative output, the negative input end of the other end connection OTA circuits 001 of S2；The negative input end of one end connection OTA circuits 001 of S3,
The output end of the other end connection OTA circuits 001 of S3；The other end that the one end S4 connects reference voltage VREF, S4 connects OTA circuits
001 positive input terminal and the other end of S1；Control logic unit 004 passes through in transmission BMC code systems signal " 1 ", " 0 "
Different control switches is opened, OTA circuits 001 are used as amplifier or comparator.
Fig. 4 is the signal control schematic diagram of transmitter shown in Fig. 1.As shown in figure 4, binding signal controls, the work of transmitter
It is as follows to make process：
It is BMC code systems this application involves transmitter transmission signal, when BMC codes are " 1 ", the control letter of switch S3, S4
Number it is " 1 ", the control signal of switch S3, S4 conducting, switch S1, S2 is " 0 ", switch S1, S2 disconnection.OTA circuits 001 are being just at this time
Voltage (VREF is VHMAX the and VHMIN medians required in agreement) on the basis of input terminal, negative input end is connect with output end,
It is equivalent to OTA circuits 001 and has been connected into unit gain reversed feedback amplifier.Since the output of preceding state OTA circuits 001 is " 0 ",
OTA circuits 001 are in large-scale condition, such as Fig. 2, and tail current I1 flows through P3 entirely at this time, according to image theory, P4/P5 pipe electricity
Stream increases I1, and the electric current for being equivalent to I1 sizes charges to capacitance C1, when (benchmark is electric to VREF is closer to for capacitor charging
Pressure) when, OTA circuits 001 enter amplifier status, under condition of small signal, meet suitable phase margin condition, OTA electricity
The output on road 001 does not have overshoot, is then finally reached VREF voltages.I1 electric currents through reasonable settings, C1 capacitances, and input
Rise time, and final voltage can be made to meet within the scope of protocol requirement pipe P2, P3 size.
When BMC codes are " 0 ", the control signal of switch S3, S4 are " 0 ", switch S3, S4 disconnection, switch S1, S2 control
Signal is " 1 ", and switch S1, S2 are connected, and prime amplifier 003 is connected into control loop.As shown in figure 4, VINP inputs at this time are reference
" ", and VINN exports for OTA circuits 001, previous state is VREF (reference voltage), through reasonable settings prime amplifier
003 gain, it is high voltage to enable to 003 output plus terminal of prime amplifier, and it is low voltage to export negative terminal, this is higher
Voltage and lower voltage have given the negative input end and positive input terminal of OTA circuits 001 by controlling switch S2, S1 respectively.For
For OTA circuits 001, so big pressure difference input so that OTA circuits 001 are in large signal operation state, and I1 electric currents are complete at this time
P2 is flowed through in portion, causes current vanishes in P4/P5 mirror image pipes in this way, and the electric current for being equivalent to I1 extracts electric current from C1.In entire BMC codes
For the process of " 0 ", since the effect of prime amplifier 003 makes OTA circuits 001 be in comparator working condition, OTA circuits always
The input of 001 anode is consistently greater than negative terminal input, finally so that the output of OTA circuits 001 meets output (0-75) mv voltages in agreement
It is required that and the failing edge time equally by I1 and C1 sizes and determination, the failing edge time can be made to meet the requirements by reasonable disposition.
So far the core of entire transmitter illustrates and finishes, and communication is to pass through cable between electrical appliance and adapter
It is attached, which has certain industry that requirement, cable model (CABLE MODEL) such as Fig. 1 is made according to agreement
Shown, amplifier 002 is connected into unit and increased by capacitance or larger thus after OTA circuits 001 plus level-one BUFFER
The form of beneficial negative-feedback makes it follow the output of OTA circuits 001, and thus the signal for meeting protocol requirement is sent.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. the transmitter in a kind of communication applied to USB-PD, which is characterized in that including：OTA circuits (001), amplifier
(002), prime amplifier (003) and control logic unit (004)；Wherein,
The positive input terminal and negative input end of the OTA circuits (001) are connected with the control logic unit (004), output with
One end of the second end of control logic unit (004), the positive input terminal of the amplifier (002) and capacitance C1 is connected, described
The other end of capacitance C1 is grounded；
Amplifier (002) positive input terminal connects the output end of the OTA circuits (001) and one end of capacitance C1, bears
Input terminal links together with itself output；
Prime amplifier (003) the positive input terminal ground connection, negative input end connect the output end of the OTA circuits (001), output
Connect the first end of the control logic unit (004)；
Control logic unit (004) first end connects the output end of the prime amplifier (003), described in second end connection
The input terminal of OTA circuits (001), third end connect the output end of the OTA circuits (001), and the 4th end connects reference voltage
VREF；
The OTA circuits (001) pass through the control logic unit (004) so that the OTA circuits (001) are operated in amplification
Device and comparator state make its output waveform disclosure satisfy that the high level in USB-PD communication protocols and low level and rising edge
With the time requirement of failing edge.
2. transmitter according to claim 1, which is characterized in that the control logic unit (004) includes：Control switch
S1, control switch S2, control switch S3 and control switch S4, wherein the one end control switch S1 connects the prime amplifier (003)
Positive output end, the other end of control switch S1 connects the positive input terminal of the OTA circuits (001), and controls switch S4's
One end；The negative output terminal that the one end switch S2 connects the prime amplifier (003) is controlled, the other end of S2 connects the OTA circuits
(001) negative input end；The one end for controlling switch S3 connects the negative input end of the OTA circuits (001), and control switch S3's is another
One end connects the output end of the OTA circuits (001)；It controls the one end switch S4 and connects reference voltage VREF, control switch S4's
The other end connects the positive input terminal of the OTA circuits (001), and the other end of control switch S1；The control logic unit
(004) in transmission BMC code systems signal " 1 ", when " 0 ", switched by opening different control, by the OTA circuits (001) when
It does amplifier or comparator uses.
3. transmitter according to claim 1, which is characterized in that the OTA circuits (001) use folded common source and common grid knot
The amplifier of structure.
4. transmitter according to claim 1, which is characterized in that the amplifier (002) uses class ab ammplifier.
5. transmitter according to claim 1 or 2, which is characterized in that it is negative anti-that the amplifier (002) is connected into unit gain
The form of feedback can track the signal of the positive input terminal of the amplifier (002) in this way, and the amplifier (002) can be protected
Demonstrate,prove smaller quiescent current, larger driving capability.
6. transmitter according to claim 1, which is characterized in that the prime amplifier (003) is fully differential output form,
To ensure the OTA circuits (001) at output " 0 ", there are enough pressure differences to input.
7. transmitter according to claim 2, which is characterized in that the prime amplifier (003) is fully differential output form,
It includes current source I1, the first PMOS tube P1, the second PMOS tube P2, resistance R1 and resistance R2；Wherein the one end current source I1 connects
Power vd D, one end connect the source electrode of P1, P2；The drain terminal of P1, P2 are separately connected one end of resistance R1, resistance R2, the grid of P1, P2
Pole is separately connected two input terminals；Resistance R1, resistance R2 the other end connection " "；Its output end connects one end of S1, S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097106.7A CN105760331B (en) | 2016-02-22 | 2016-02-22 | A kind of transmitter being applied in USB-PD communications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610097106.7A CN105760331B (en) | 2016-02-22 | 2016-02-22 | A kind of transmitter being applied in USB-PD communications |
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| Publication Number | Publication Date |
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| CN105760331A CN105760331A (en) | 2016-07-13 |
| CN105760331B true CN105760331B (en) | 2018-10-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055507B (en) * | 2016-07-29 | 2024-03-15 | 珠海智融科技股份有限公司 | BMC signal transmitting device for USB PD communication |
| CN108829931B (en) * | 2018-05-18 | 2022-07-05 | 龙迅半导体（合肥）股份有限公司 | BMC transceiver |
| CN109327195A (en) * | 2018-10-26 | 2019-02-12 | 成都锐成芯微科技股份有限公司 | A kind of operation amplifier circuit of low noise |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204668976U (en) * | 2015-03-26 | 2015-09-23 | 深圳市力可普尔电子有限公司 | Portable power source and charging system |
| CN105183679A (en) * | 2015-09-01 | 2015-12-23 | 联想(北京)有限公司 | Electronic device and information processing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2401808B1 (en) * | 2008-10-01 | 2014-05-28 | Restech Limited | Circuit and method for coupling electrical energy to a resonated inductive load |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204668976U (en) * | 2015-03-26 | 2015-09-23 | 深圳市力可普尔电子有限公司 | Portable power source and charging system |
| CN105183679A (en) * | 2015-09-01 | 2015-12-23 | 联想(北京)有限公司 | Electronic device and information processing method |
Non-Patent Citations (1)
| Title |
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| 《集成式USB Type-C供电控制器》;无;《今日电子》;20151031(第10期);第1-2页 * |
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Effective date of registration: 20210422 Address after: No.1, floor 4, building 10, No.303, group 3, liangfengding village, Zhengxing Town, Tianfu New District, Chengdu, Sichuan 610000 Patentee after: Sichuan Yichong Technology Co.,Ltd. Address before: 300457, Tianjin Binhai New Area, Tianjin Development Zone, No. 19 West Ring Road, TEDA service outsourcing Garden No. 2701-1 building, room 2 Patentee before: INTERNATIONAL GREEN CHIP (TIANJIN) Co.,Ltd. |
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