CN105871389A - Current-mode transmitter structure - Google Patents
Current-mode transmitter structure Download PDFInfo
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- CN105871389A CN105871389A CN201610212816.XA CN201610212816A CN105871389A CN 105871389 A CN105871389 A CN 105871389A CN 201610212816 A CN201610212816 A CN 201610212816A CN 105871389 A CN105871389 A CN 105871389A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
Abstract
This invention relates to a transmitter structure, is particularly applicable to a higher frequency, specifically relates to a current-mode transmitter structure, and belongs to the technical field of radio frequency integrated circuit. The current-mode transmitter provided in the technical scheme of the invention comprises a phase-locked loop circuit generated by a local oscillator signal, a voltage-to-current switching circuit, an E-type current-mode power amplifier, a power combiner and a transmitting antenna. The voltage-to-current switching circuit switches a baseband voltage signal into a current signal so as to control the E-type current-mode power amplifier; then, the local oscillator signal is directly used as an input signal to drive the E-type current-mode power amplifier to improve the efficiency of the power amplifier; the power combiner transforms a differential signal into a single-ended signal, and the single-ended signal is transmitted by the antenna. The current-mode transmitter structure provided in the invention has a simple and compact structure, reduces the complexity of the circuit, effectively improves the efficiency and linearity of the transmitter, and completely satisfies the efficiency and linearity requirements of the radio transmitter system.
Description
Technical field
The present invention relates to a kind of transmitter (Transmitter) structure, specifically a kind of current mode transmitter architecture
(Current-mode Transmitter), belongs to the technical field of RF IC.
Background technology
Widely, particularly in the application that frequency ratio is higher, advantage is obvious especially, passes in the present invention applicable field
The transmitting chain structured flowchart of system is as it is shown in figure 1, be mainly made up of following components: comprise voltage controlled oscillator VCO
Fractional frequency synthesizer PLL, produce carrier frequency upper frequency mixer MIXER1, it is achieved signal modulation frequency mixer
MIXER2, power amplifier PA and transmitting antenna.In transmitter designs, in order to avoid backlash,
Generally voltage controlled oscillator will not vibrate in carrier frequency, in the application for relatively low rf frequency, can vibrate two
Required carrier frequency is obtained by frequency dividing again at frequency multiplication, but for the transmitter of frequency applications, such as 5.8GHz
In, will not be typically two frequencys multiplication by alternator resonant Frequency Design, and can vibrate at the 2/3 of carrier frequency, so
Obtaining required carrier frequency by one upper frequency mixer of increase afterwards, MIXER1 as shown in Figure 1 is by two routes
Carrier frequency signaling required for the common generation of local oscillation signal input of PLL output.Base-band input signal is whole by some
After shape processes, the analogue signal of output is input to MIXER2, and then at outfan by modulates baseband signals to carrier wave,
Finally this modulated signal is after PA amplifies, antenna launch.
Traditional transmitter architecture is more complicated, and link is the longest, and especially for higher radio frequency frequency, link is long very
Easily produce loss of signal big, launch power the least, the problem that efficiency is the lowest.The design of radio frequency chip account for main
The device of area is usually inductance, typically constitutes from, with the most higher area of radio frequency chip nearly 50%, reducing radio frequency chip
The number of middle inductance and the area of inductance are usually used as reducing the chip area reduction main effective manner of chip cost,
And PLL in traditional transmitter structure as shown in Figure 1, MIXER1, MIXER2 and PA all have inductance,
Four inductance occupy the most most chip area.Reducing chip area, reducing cost is radio frequency transceiver research and development
During very important research direction.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of current mode transmitter architecture, its knot
Structure is compact, has shortened transmitter signal link, reduces the complexity of circuit, decreases the number of inductance in radio frequency chip,
Reduction chip cost, and the transmitting power of signal can be improved, improve emission effciency, safe and reliable.
The technical scheme provided according to the present invention, a kind of current mode transmitter architecture, it is characterized in that: include local oscillation signal
The phase-locked loop circuit produced, the change-over circuit of base-band voltage signal to current signal, Current-mode Power Amplifier, power
Synthesizer and transmitting antenna；It is characterized in that: described phase-locked loop circuit produce difference local oscillation signal, the first differential signal and
Second differential signal is respectively VIP_LO, VIN_LO, and the change-over circuit of described voltage signal to current signal has difference
The first input end of base-band voltage signal and the second input, be VIP_BB, VIN_BB respectively, and has two outfans,
First outfan VBP and the second outfan VBN；Described Current-mode Power Amplifier is provided with difference local oscillation signal
First input end and the second input, input the first differential signal and the second differential signal VIP_LO, VIN_LO respectively,
And using the first outfan VBP and the second outfan VBN of differential baseband voltage signal as bias voltage
First input end and the second input, outfan is differential signal, connects the input of described power combiner, described
Outfan one end ground connection of power combiner, the other end is connected with described transmitting antenna.
The operating frequency of the voltage controlled oscillator used in the phase-locked loop circuit that described local oscillation signal produces is arranged on transmitting letter
Number carrier frequency.
Described base-band voltage signal includes feeder ear AVDD18 and earth terminal to the change-over circuit of current signal
AGND18, two input VIP_BB and VIN_BB and two outfan VBP and VBN, also include crystal
Pipe, MN1, MN2, MN3, MN4, MN5, MN6, MN7 and MP1, MP2, MP3, MP4；Brilliant
The grid of body pipe MN1, MN2 connects two input VIP_BB and VIN_BB respectively, source class connect respectively MN3,
The drain electrode of MN4；The grid of MN3, MN4, MN5 interconnects respectively, and connects feeder ear, source class all with connect
Ground end connects, and connects the source class of MN5, MN6 and MN7；The grid of MN6 and MN7 all with respective drain electrode
It is connected, and is connected with input VBP and VBN respectively, and connect the drain electrode of MP3 and MP4 respectively；MN1
Drain electrode with MN2 connects grid and the drain electrode of MP1 and MP2 respectively, and respectively with the grid of MP3 and MP4
It is connected；The source class of MP1, MP2, MP3, MP4 connects feeder ear respectively.
Described base-band voltage signal is to the change-over circuit of current signal, by base-band voltage signal VIP_BB and VIN_BB
It is converted into current signal by MN1 and MN2, then by current mirror, MP1 with MP3 and MP2 with MP4 is turned
Turn to current signal IBP and IBN, then produce bias voltage by MN6 and MN7 that diode connects, as
The current mirroring circuit of next stage.
The source class of transistor MN1 and MN2 in described base-band voltage signal to the change-over circuit of current signal passes through
Resistance R1 with R2 of series connection is connected.
Described Current-mode Power Amplifier includes transistor MN8, MN9, MP5, MP6, MP7, MP8 and penetrates
Frequently transistor MN1_RF, MN2_RF, MN3_RF, MN4_RF, MN5_RF, MN6_RF, MN7_RF,
MN8_RF, MN9_RF, MN10_RF, MN11_RF, MN12_RF, also include arriving with base-band voltage signal
Two inputs that change-over circuit outfan VBP and VBN of current signal is respectively connected with, believe with the local oscillator of phaselocked loop
Number two inputs that outfan VIP_LO and VIN_LO is respectively connected with, the first power end AVDD18 and second electricity
Source AVDD33；
The grid of MN6_RF and MN12_RF connect respectively local oscillation signal outfan VIP_LO, MN5_RF and
The grid of MN11_RF connects local oscillation signal outfan VIN_LO respectively；MN5_RF, MN6_RF, MN11_RF,
The equal ground connection of drain electrode of MN12_RF；Base-band voltage signal is to change-over circuit outfan VBP and VBN of current signal
Connect the grid of MN8 and MN9, the equal ground connection of source class of MN8 and MN9 respectively；MN4_RF and MN5_RF
Grid connect power end AVDD18, the equal ground connection of source class；MN1_RF、MN2_RF、MN7_RF、MN8_RF、
The source class of MN9_RF connects MN4_RF, MN5_RF respectively, MN10_RF, MN11_RF, MN12_RF's
Drain electrode；The grid of MN2_RF with MN3_RF is connected, and is connected by the grid of resistance R3 with MN1_RF；
The grid of MN8_RF with MN9_RF is connected, and is connected by the grid of resistance R4 with MN7_RF；MN1_RF
It is connected with respective drain electrode respectively with the grid of MN7_RF, and connects the drain electrode of MP6 and MP8 respectively；MP5、
The source class of MP6, MP7, MP8 connects second source end AVDD33 respectively；The grid of MP5 and MP7 respectively and
Respective drain electrode is connected, and connects the drain electrode of MN8 and MN9, the drain electrode phase of MN2_RF and MN9_RF respectively
Connecting and connect the first input end of described power combiner, the drain electrode of MN3_RF with MN8_RF is connected and connects described
Second input of power combiner.
Described MN8 Yu MN9 in Current-mode Power Amplifier is respectively and MN6 Yu MN7 constitutes current mirror, and
By current mirror, MP5 Yu MP6 and MP7 Yu MP8 is made current signal I1=I3=IBP and I2=I4=IBN；
Difference local oscillation signal VIP_LO and VIN_LO as input switching signal, control MN5_RF, MN6_RF,
Whether the conducting of MN11_RF, MN12_RF to be, so control difference output end pass through electric current.
Described power combiner is to use Transformer on sheet to realize, and uses two coils intercoupled, logical
Cross the output signal that output couple differential signals is become single-ended by electromagnetic induction phenomenon, then drive loaded antenna.
Described base-band voltage signal is 1.8V to the supply voltage AVDD18 of the change-over circuit of current signal, and described electricity
The supply voltage AVDD33 of flow pattern power amplifier is 3.3V.
Advantages of the present invention:
1, the voltage controlled oscillator frequency of oscillation in the phase-locked loop circuit that local oscillation signal produces is directly carrier frequency, decreases
A upconverter in traditional structure, reduces chip area.
2, base-band voltage signal is converted into current signal and is controlled Current-mode Power Amplifier, shorten signal path
Link, can improve the communication quality of signal, decreases local oscillation signal in traditional structure simultaneously and is mixed mutually with baseband signal
Frequency mixer, further reduce chip area.
3, use current mode E power-like amplifier to launch signal, use current mode differential configuration to can ensure that signal
The linearity, will not change the modulation depth of signal, and use Switch power amplifier can improve emission effciency,
In the case of transmitting power is the same, reduce the power consumption of chip.
4, use Transformer on sheet to realize power combiner, emission effciency can be improved further, also may be used simultaneously
Turn single-ended device with minimizing periphery coupling and difference, reduce the cost of whole system.
5, base-band voltage signal uses different supply voltages to the change-over circuit of current signal with Current-mode Power Amplifier
And ground reference, in the case of not affecting transmitting power and emission effciency, low-voltage can reduce other circuit parts
Power consumption.Use different reference electronegative potentials, it is possible to reduce the letter between power amplifier and other disparate modules simultaneously
Number crosstalk.
Accompanying drawing explanation
Fig. 1 is traditional transmitter structured flowchart.
Fig. 2 is current mode transmitter architecture block diagram of the present invention.
Fig. 3 is that the base-band voltage signal used in the present invention is to the change-over circuit figure of current signal.
Fig. 4 is the Current-mode Power Amplifier used in the present invention.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As in figure 2 it is shown, be current mode transmitter architecture block diagram of the present invention, the phase-locked loop circuit produced including local oscillation signal,
Base-band voltage signal, to the change-over circuit of current signal, Current-mode Power Amplifier, power combiner, launches antenna.
Described phase-locked loop circuit produces difference local oscillation signal, and wherein difference local oscillation signal includes the first differential signal and second
Differential signal, respectively VIP_LO, VIN_LO, the change-over circuit of described voltage signal to current signal has difference base
The first input end of signal with voltage and the second input (being VIP_BB, VIN_BB respectively), and have two outfans,
First outfan VBP and the second outfan VBN, described Current-mode Power Amplifier is provided with difference local oscillation signal
First input end and the second input (inputting the first differential signal and the second differential signal VIP_LO, VIN_LO respectively),
And using the first outfan VBP and the second outfan VBN of differential baseband voltage signal as bias voltage
First input end and the second input, outfan is differential signal, connects the input of described power combiner, described
Outfan one end ground connection of power combiner, the other end is connected with described transmitting antenna.
The phase-locked loop circuit that described local oscillation signal produces directly provides local oscillation signal for Current-mode Power Amplifier, phase-locked
Loop circuit part has two difference output ports, VIP_LO and VIN_LO, with next circuit module current mode power
Two difference output ports of amplifier are connected, and phase-locked loop circuit can use the phase-locked loop circuit of the fractional frequency division of routine,
Circuit structure no longer repeats, in this application can be by the direct resonance of voltage controlled oscillator frequency of oscillation in phase-locked loop circuit
To launching signal(-) carrier frequency, it is not necessary to need voltage controlled oscillator with in other transmitters, the phaselocked loop of use is similar
Frequency of oscillation arranges other frequencies to avoid occurrence frequency pulling effect.Therefore phaselocked loop can be saved a upper change
Frequently device is to save area.
Described base-band voltage signal is to the concrete connected mode within the change-over circuit of current signal as it is shown on figure 3, institute
The base-band voltage signal stated includes feeder ear AVDD18 and the earth terminal of 1.8V to the change-over circuit of current signal
AGND18, two inputs (VIP_BB and VIN_BB) and two outfans (VBP and VBN), also include crystalline substance
Body pipe, MN1, MN2, MN3, MN4, MN5, MN6, MN7 and MP1, MP2, MP3, MP4.
The grid of transistor MN1 and MN2 connects two inputs (VIP_BB and VIN_BB) respectively, and source class connects respectively
The drain electrode of MN3 and MN4；The grid of MN3, MN4, MN5 interconnects respectively, and connects feeder ear, source class
All it is connected with earth terminal, and connects the source class of MN5, MN6 and MN7；The grid of MN6 and MN7 is all with respective
Drain electrode be connected, and be connected with input VBP and VBN respectively, and the drain electrode of connection MP3 and MP4 respectively；
The drain electrode of MN1 and MN2 connects grid and the drain electrode of MP1 and MP2 respectively, and respectively with MP3 and MP4
Grid be connected；The source class of MP1, MP2, MP3, MP4 connects feeder ear respectively.
Wherein in concrete application, signal VIP_BB and VIN_BB that base band comes is to have direct current biasing (such as 1V)
Medium and low frequency differential signal.Transistor MN5, MN4, MN3 constitute current mirror, and respectively two branch roads provide solid
Fixed DC bias current, then transistor MN1 and MP1, transistor MN2 and MP2 respectively constitute an electricity
Voltage-current converter, baseband signal input arrive grid, then transistor MN1 or MN2 by voltage signal by across
The effect led transfers the electric current flowing through transistor MN1 or MN2 to, and MP1 and MP3, MP2 and MP4 respectively constitute
Current mirror, voltage conversion the electric current come passes to transistor MN6 and MN7 of diode connected mode, so again
Two bias voltage VBP and VBN of rear generation, here, transistor MN6 and MN7 respectively with the electricity of next stage
Transistor MN8 and MN9 in flow pattern power amplifier constitutes current-mirror structure, and then goes to control current mode power again
The size of current of amplifier.By this process to base-band voltage signal transferred current signal, and be delivered to next stage electricity
In flow pattern power amplifier.
In the application of a lot of band modulated signals, due to baseband signal be direct current biasing be 1V, modulation depth is 0.5～1
Signal, generally can change at 1V-1.5V, the excursion of voltage is relatively big, and the electric current after converting also needs
Change voltage linear to be followed, the transistor MN1 in base-band voltage signal to the change-over circuit of current signal and
The source class of MN2 is connected by resistance R1 with R2 of series connection, can strengthen base-band voltage signal turning to current signal
Change the linearity of circuit, widen the input voltage range of circuit.
The concrete connected mode of described Current-mode Power Amplifier is as shown in Figure 4.Described current mode power is put
Big device include transistor MN8, MN9, MP5, MP6, MP7, MP8 and RF transistors MN1_RF, MN2_RF,
MN3_RF、MN4_RF、MN5_RF、MN6_RF、MN7_RF、MN8_RF、MN9_RF、MN10_RF、
MN11_RF, MN12_RF, also include change-over circuit outfan with base-band voltage signal to current signal (VBP and
VBN) two inputs being respectively connected with, with local oscillation signal outfan VIP_LO and the VIN_LO phase respectively of phaselocked loop
Two inputs even, the first power end AVDD18 and second source end AVDD33.
The grid of MN6_RF and MN12_RF connects local oscillation signal outfan VIP_LO respectively；MN5_RF and
The grid of MN11_RF connects local oscillation signal outfan VIN_LO respectively；MN5_RF、MN6_RF、MN11_RF、
The equal ground connection of drain electrode of MN12_RF；Base-band voltage signal is to the change-over circuit outfan (VBP and VBN) of current signal
Connect the grid of MN8 and MN9, the equal ground connection of source class of MN8 and MN9 respectively；MN4_RF and MN5_RF
Grid connect power end AVDD18, the equal ground connection of source class；MN1_RF、MN2_RF、MN7_RF、MN8_RF、
The source class of MN9_RF connects MN4_RF, MN5_RF, MN10_RF, MN11_RF, MN12_RF respectively
Drain electrode；The grid of MN2_RF with MN3_RF is connected, and is connected by the grid of resistance R3 with MN1_RF；
The grid of MN8_RF with MN9_RF is connected, and is connected by the grid of resistance R4 with MN7_RF；MN1_RF
It is connected with respective drain electrode respectively with the grid of MN7_RF, and connects the drain electrode of MP6 and MP8 respectively；MP5、
The source class of MP6, MP7, MP8 connects second source end AVDD33 respectively；The grid of MP5 and MP7 respectively and
Respective drain electrode is connected, and connects the drain electrode of MN8 and MN9 respectively；The drain electrode phase of MN2_RF and MN9_RF
Connect and connect the first input end of described power combiner；The drain electrode of MN3_RF with MN8_RF is connected and connects described
Second input of power combiner.
Current-mode Power Amplifier uses the supply voltage of 3.3V, so employing two kinds of transistors, Yi Zhongshi in circuit
The transistor used under 1.8V voltage, mainly switchs the speed opened fast, and a kind of is the crystalline substance under 3.3V voltage
Body pipe, main consideration is pressure, prevents the voltage instantaneous in power amplifier from causing not more than breakdown transistors during 3.3V
Recoverable infringement.Circuit has four signal input ports, arrives the conversion of current signal including base-band voltage signal
The local oscillation signal output port (VIP_LO and VIN_LO) of circuit output end mouth (VBP and VBN) and phaselocked loop.MN8
With the grid of MN9 respectively with outfan VBP and VBN of the change-over circuit of prime base-band voltage signal to current signal
It is connected so that equal with the electric current that front step voltage is converted to respectively by their electric current.Transistor MP5 and
MP6, transistor MP7 and MP8 respectively constitute current-mirror structure, then electric current IBP and IBN are replicated stream respectively
Cross RF transistors MN1_RF and MN7_RF, then by MN1_RF, MN2_RF, MN3_RF composition
Current mirror and MN7_RF, the current mirror of MN8_RF, MN9_RF composition makes to flow through MN2_RF, MN3_RF
With the electric current of MN8_RF, MN9_RF meets:
I1=I3=IBP (1)
I2=I4=IBN (2)
The grid of RF transistors MN6_RF with MN12_RF is connected with the output port VIP_LO of phaselocked loop,
And the grid of RF transistors MN5_RF with MN11_RF is connected with the output port VIN_LO of phaselocked loop, this
Four RF tubes are equivalent to switch under the driving of local oscillation signal, and local oscillation signal is as switching signal.Switching tube is being led
Certain small resistor is had, in order to match with switching tube, RF transistors MN1_RF's and MN7_RF time logical
Source class connects RF transistors MN4_RF and MN10_RF, the grid of RF transistors MN4_RF and MN10_RF
Pole is connected with supply voltage so that they are the most in the conduction state so that the precision that formula (1) and formula (2) meet is higher.
When local oscillation signal is positive half period when, RF transistors MN6_RF and MN12_RF turns on, and radio frequency
Transistor MN5_RF and MN11_RF closes, and now has:
I5=I4=IBN (3)
I6=I3=IBP (4)
I.e. corresponding difference current is:
IOUT=I5-I6=IBP-IBN (5)
When local oscillation signal is negative half-cycle when, RF transistors MN5_RF and MN11_RF turns on, and radio frequency
Transistor MN6_RF and MN12_RF closes, and now has:
I5=I1=IBP (6)
I6=I2=IBN (7)
I.e. corresponding difference current is:
IOUT=I5-I6=IBN-IBP (8)
From formula (5) and formula (8) as long as it will be seen that difference current is converted into electric current for linearly just can keep line at baseband voltage
Sexual state, will not be the nonlinear power amplifier of E class because of power amplifier and become non-linear.In differential ends
Output electric current and the product exporting impedance are the voltage signal of outfan, then the voltage signal of this difference is sent into power
Synthesizer.
As shown in Figure 4, input is connected described power combiner with the difference output end of Current-mode Power Amplifier,
Outfan one end ground connection, the other end is power take-off, the antenna driving load to be 50 Ω.The power that the present invention uses
Synthesizer is to use Transformer on sheet to realize, and uses two coils intercoupled, passes through electromagnetic induction phenomenon
The couple differential signals of output is become single-ended output signal.
Described base-band voltage signal, to the change-over circuit of current signal and Current-mode Power Amplifier, uses different confessions
Piezoelectric voltage and ground reference potential, supply voltage has been respectively adopted 1.8V and 3.3V, it is ensured that the transmitting of power amplifier
Power and emission effciency, can reduce again the power consumption of other circuit modules simultaneously, and circuit also uses two groups with reference to ground electricity
Position, so can reduce the signal cross-talk caused by ground wire, and this is even more important in high-frequency radio frequency design.
Present invention reduces the complexity of circuit, modeling is simple, it is easy to adjusts circuit parameter and reaches the design requirement of circuit,
Use current mode transmitter architecture, decrease traditional circuit module, taken into account the design of the linearity and emission effciency, done
Arrive low power consumption and low cost.
Protection scope of the present invention, is not limited to embodiments described herein.As long as various changes are in appended right
In requiring the spirit and scope of the present invention limiting and determining, these changes are apparent from, and all utilize the present invention
The example of design is all at the row of protection.
Claims (9)
1. a current mode transmitter architecture, is characterized in that: include the phase-locked loop circuit that local oscillation signal produces, base band electricity
Pressure signal is to the change-over circuit of current signal, Current-mode Power Amplifier, power combiner and transmitting antenna；Described lock
Phase loop circuit produces difference local oscillation signal, and the first differential signal and the second differential signal are respectively VIP_LO, VIN_LO,
Described voltage signal has the first input end and second of differential baseband voltage signal to input to the change-over circuit of current signal
End, is VIP_BB, VIN_BB respectively, and has two outfans, the first outfan VBP and the second outfan VBN；
Described Current-mode Power Amplifier is provided with first input end and second input of difference local oscillation signal, inputs respectively
One differential signal and the second differential signal VIP_LO, VIN_LO, and the first outfan with differential baseband voltage signal
VBP and the second outfan VBN is respectively as the first input end of bias voltage and the second input, and outfan is for poor
Sub-signal, connects the input of described power combiner, outfan one end ground connection of described power combiner, another
End is connected with described transmitting antenna.
2. current mode transmitter architecture as claimed in claim 1, is characterized in that: the lock that described local oscillation signal produces
The operating frequency of the voltage controlled oscillator used in phase loop circuit is arranged on transmitting signal(-) carrier frequency.
3. current mode transmitter architecture as claimed in claim 1, is characterized in that: described base-band voltage signal is to electricity
The change-over circuit of stream signal includes feeder ear AVDD18 and earth terminal AGND18, two input VIP_BB and
VIN_BB and two outfan VBP and VBN, also includes transistor, MN1, MN2, MN3, MN4,
MN5, MN6, MN7 and MP1, MP2, MP3, MP4；The grid of transistor MN1, MN2 connects respectively
Two input VIP_BB and VIN_BB, source class connects the drain electrode of MN3, MN4 respectively；MN3、MN4、
The grid of MN5 interconnects respectively, and connects feeder ear, and source class is all connected with earth terminal, and connects MN5, MN6
Source class with MN7；The grid of MN6 with MN7 is all connected with respective drain electrode, and respectively with input VBP
It is connected with VBN, and connects the drain electrode of MP3 and MP4 respectively；The drain electrode of MN1 and MN2 connects MP1 respectively
With grid and the drain electrode of MP2, and it is connected with the grid of MP3 and MP4 respectively；MP1、MP2、MP3、MP4
Source class connect feeder ear respectively.
4. current mode transmitter architecture as claimed in claim 3, is characterized in that: described base-band voltage signal is to electricity
The change-over circuit of stream signal, is converted into electricity by base-band voltage signal VIP_BB and VIN_BB by MN1 and MN2
Stream signal, then by current mirror, MP1 Yu MP3 and MP2 Yu MP4 is converted into current signal IBP and IBN,
Then MN6 and MN7 connected by diode produces bias voltage, as the current mirroring circuit of next stage.
5. current mode transmitter architecture as claimed in claim 3, is characterized in that: at described base-band voltage signal to electricity
The source class of transistor MN1 with MN2 in the change-over circuit of stream signal is connected by resistance R1 with R2 of series connection.
6. current mode transmitter architecture as claimed in claim 3, is characterized in that: described Current-mode Power Amplifier
Including transistor MN8, MN9, MP5, MP6, MP7, MP8 and RF transistors MN1_RF, MN2_RF,
MN3_RF、MN4_RF、MN5_RF、MN6_RF、MN7_RF、MN8_RF、MN9_RF、MN10_RF、
MN11_RF, MN12_RF, also include the change-over circuit outfan VBP with base-band voltage signal to current signal and
Two inputs that VBN is respectively connected with, with local oscillation signal outfan VIP_LO and the VIN_LO phase respectively of phaselocked loop
Two inputs even, the first power end AVDD18 and second source end AVDD33；
The grid of MN6_RF and MN12_RF connect respectively local oscillation signal outfan VIP_LO, MN5_RF and
The grid of MN11_RF connects local oscillation signal outfan VIN_LO respectively；MN5_RF, MN6_RF, MN11_RF,
The equal ground connection of drain electrode of MN12_RF；Base-band voltage signal is to change-over circuit outfan VBP and VBN of current signal
Connect the grid of MN8 and MN9, the equal ground connection of source class of MN8 and MN9 respectively；MN4_RF and MN5_RF
Grid connect power end AVDD18, the equal ground connection of source class；MN1_RF、MN2_RF、MN7_RF、MN8_RF、
The source class of MN9_RF connects MN4_RF, MN5_RF respectively, MN10_RF, MN11_RF, MN12_RF's
Drain electrode；The grid of MN2_RF with MN3_RF is connected, and is connected by the grid of resistance R3 with MN1_RF；
The grid of MN8_RF with MN9_RF is connected, and is connected by the grid of resistance R4 with MN7_RF；MN1_RF
It is connected with respective drain electrode respectively with the grid of MN7_RF, and connects the drain electrode of MP6 and MP8 respectively；MP5、
The source class of MP6, MP7, MP8 connects second source end AVDD33 respectively；The grid of MP5 and MP7 respectively and
Respective drain electrode is connected, and connects the drain electrode of MN8 and MN9, the drain electrode phase of MN2_RF and MN9_RF respectively
Connecting and connect the first input end of described power combiner, the drain electrode of MN3_RF with MN8_RF is connected and connects described
Second input of power combiner.
7. current mode transmitter architecture as claimed in claim 6, is characterized in that: described Current-mode Power Amplifier
In MN8 Yu MN9 respectively and MN6 Yu MN7 constitutes current mirror, and by current mirror to MP5 Yu MP6 and
MP7 Yu MP8 makes current signal I1=I3=IBP and I2=I4=IBN；Difference local oscillation signal VIP_LO and
VIN_LO, as the switching signal of input, controls MN5_RF, MN6_RF, MN11_RF, MN12_RF
Whether turn on, so control difference output end pass through electric current.
8. current mode transmitter architecture as claimed in claim 1, is characterized in that: described power combiner is to use
On sheet, Transformer realizes, and uses two coils intercoupled, and output difference is believed by electromagnetic induction phenomenon
Number coupling becomes single-ended output signal, then drives loaded antenna.
9. current mode transmitter architecture as claimed in claim 6, is characterized in that: described base-band voltage signal is to electric current
The supply voltage AVDD18 of the change-over circuit of signal is 1.8V, and the supply voltage of described Current-mode Power Amplifier
AVDD33 is 3.3V.
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| CN115932748A (en) * | 2023-03-02 | 2023-04-07 | 北京大有半导体有限责任公司 | On-chip radio frequency radar transmitting system and on-chip radio frequency radar |
| CN115932748B (en) * | 2023-03-02 | 2023-10-24 | 北京大有半导体有限责任公司 | On-chip radio frequency radar transmitting system and on-chip radio frequency radar |
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