CN217116076U - Differential millimeter wave communication architecture and electronic equipment - Google Patents
Differential millimeter wave communication architecture and electronic equipment Download PDFInfo
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- CN217116076U CN217116076U CN202220938073.5U CN202220938073U CN217116076U CN 217116076 U CN217116076 U CN 217116076U CN 202220938073 U CN202220938073 U CN 202220938073U CN 217116076 U CN217116076 U CN 217116076U
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Abstract
The utility model discloses a differential millimeter wave communication architecture and electronic equipment, including emitter, the emitter includes oscillator, frequency multiplier, first differential transformer, at least one drive amplifier circuit and power amplifier circuit that connect gradually; the drive amplifier circuit comprises a drive amplifier and a second differential transformer which are connected in sequence, the power amplifier circuit comprises a power amplifier and a third differential transformer which are connected in sequence, the power amplifier comprises a signal switch, and the signal switch is connected with an on-off keying signal input end. The utility model discloses can realize low-power consumption and little area's millimeter wave front end circuit.
Description
Technical Field
The utility model relates to a wireless communication technology field especially relates to a differential formula millimeter wave communication framework and electronic equipment.
Background
The traditional superheterodyne modulation radio frequency front end is widely applied to products such as mobile phones, WiFi equipment and Bluetooth equipment. As shown in fig. 1, it is necessary to have a LO BASEBAND plus a PLL frequency locker to modulate a signal to a carrier frequency, and then amplify the signal for transmission or reception by an amplifier, so that there are basically several large blocks of LO circuits, MIXERs, MIXER, transmitter TX, receiver RX, and digital-to-analog conversion circuits, and in addition, there are corresponding BASEBAND BASEBANDs, (for example, WiFi devices require MAC and PHY layers), and possible additional high-selectivity filters (for example, the surface acoustic wave filter SAW FILTER of a mobile phone), which are devices required by a complex system, and the power consumption and size of the devices are often large. Therefore, how to reduce the power consumption and area of the rf front-end circuit is a problem to be solved.
In addition, millimeter wave band (30-300 GHz) has the inherent advantage of high bandwidth, however, the disadvantage of oxygen attenuation (oxygen attenuation) at 60GHz is that the signal is not easy to transmit compared with the common commercial specification, but does not cause interference compared with the existing communication system; in addition, most millimeter wave bands are public bands (Unlicensed bands) used without certification. Based on this, the millimeter wave is particularly suitable for application-specific products for short-distance and high-data-volume communication. However, in the conventional millimeter wave circuit for high data volume and high speed transmission, noise easily interferes with the front end circuit characteristics.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a differential millimeter wave communication architecture and an electronic device are provided, which can realize a millimeter wave front end circuit with low power consumption and small area.
In order to solve the technical problem, the utility model discloses a technical scheme be: a differential millimeter wave communication architecture comprises a transmitting device, wherein the transmitting device comprises an oscillator, a frequency multiplier, a first differential transformer, at least one driving amplifying circuit and at least one power amplifying circuit which are sequentially connected; the drive amplifier circuit comprises a drive amplifier and a second differential transformer which are connected in sequence, the power amplifier circuit comprises a power amplifier and a third differential transformer which are connected in sequence, the power amplifier comprises a signal switch, and the signal switch is connected with an on-off keying signal input end.
Further, the signal switch is connected to a virtual ground node.
Furthermore, a positive signal output end of the oscillator is connected with a positive signal input end of the frequency multiplier, and a negative signal output end of the oscillator is connected with a negative signal input end of the frequency multiplier;
a positive signal output end of the frequency multiplier is connected with one end of the primary coil of the first differential transformer, and a negative signal output end of the frequency multiplier is connected with the other end of the primary coil of the first differential transformer;
one end of a secondary coil of the first differential transformer is connected with a positive electrode signal input end of a driving amplifier in the first driving amplification circuit, and the other end of the secondary coil of the first differential transformer is connected with a negative electrode signal input end of the driving amplifier in the first driving amplification circuit;
the positive signal output end of the driving amplifier is connected with one end of a primary coil of a second differential transformer, and the negative signal output end of the driving amplifier is connected with the other end of the primary coil of the second differential transformer;
one end of a secondary coil of the second differential transformer is connected with a positive electrode signal input end of a driving amplifier in the next driving amplification circuit, and the other end of the secondary coil of the second differential transformer is connected with a negative electrode signal input end of the driving amplifier in the next driving amplification circuit;
one end of a secondary coil of a second differential transformer in the last drive amplifying circuit is connected with the positive electrode signal input end of the power amplifier, and the other end of the secondary coil of the second differential transformer in the last drive amplifying circuit is connected with the negative electrode signal input end of the power amplifier;
a positive signal output end of the power amplifier is connected with one end of the primary coil of the third differential transformer, and a negative signal output end of the power amplifier is connected with the other end of the primary coil of the third differential transformer;
one end of a secondary coil of the third differential transformer is connected with the transmitting end of the transmitting device, and the other end of the secondary coil of the third differential transformer is grounded.
Further, the frequency multiplier comprises a first nonlinear element, a second nonlinear element and a band-stop filter; the grid electrode of the first nonlinear element is connected with the positive electrode signal input end of the frequency multiplier, the drain electrode of the first nonlinear element is respectively connected with the positive electrode signal output end and one end of the band elimination filter, and the source electrode of the first nonlinear element is grounded; the grid electrode of the second nonlinear element is connected with the negative electrode signal input end of the frequency multiplier, the drain electrode of the second nonlinear element is respectively connected with the negative electrode signal output end of the frequency multiplier and the other end of the band elimination filter, and the source electrode of the second nonlinear element is grounded.
Further, the first nonlinear element and the second nonlinear element are field effect transistors, bipolar junction transistors, heterojunction bipolar transistors or field effect transistors.
Further, the power amplifier comprises a first active device, a second active device and a signal switch, wherein the signal switch is a switching tube; the grid electrode of the first active device is connected with the positive electrode signal input end of the power amplifier, and the drain electrode of the first active device is connected with the positive electrode signal output end of the power amplifier; the grid electrode of the second active device is connected with the negative electrode signal input end of the power amplifier, and the drain electrode of the second active device is connected with the negative electrode signal output end of the power amplifier; the source electrode of the first active device and the source electrode of the second active device are respectively connected with the drain electrode of the switching tube; the grid electrode of the switch tube is connected with the on-off keying signal input end, and the source electrode is grounded; the source of the switch tube is connected with the virtual ground node.
The receiving device comprises a fourth differential transformer, a low noise amplifier, a fifth differential transformer and a differential peak detector which are connected in sequence; the fifth differential transformer includes one primary coil and two secondary coils.
Furthermore, one end of the primary coil of the fourth differential transformer is connected with the receiving end of the receiving device, and the other end of the primary coil of the fourth differential transformer is grounded; one end of a secondary coil of the fourth differential transformer is connected with the positive signal input end of the low noise amplifier, and the other end of the secondary coil of the fourth differential transformer is connected with the negative signal input end of the low noise amplifier;
a positive signal output end of the low-noise amplifier is connected with one end of the primary coil of the fifth differential transformer, and a negative signal output end of the low-noise amplifier is connected with the other end of the primary coil of the fifth differential transformer;
one end of a first secondary coil of the fifth differential transformer is connected with a first positive signal input end of the differential peak detector, and the other end of the first secondary coil of the fifth differential transformer is connected with a first negative signal input end of the differential peak detector; one end of a second secondary coil of the fifth differential transformer is connected with a second positive signal input end of the differential peak detector, and the other end of the second secondary coil of the fifth differential transformer is connected with a second negative signal input end of the differential peak detector.
Further, the differential peak detector comprises a first diode, a second diode, a third nonlinear element and a fourth nonlinear element;
one end of the first diode is connected with a first positive electrode signal input end of the differential wave crest detector, and the other end of the first diode is grounded; one end of the second diode is connected with a second negative electrode signal input end of the differential type peak detector, and the other end of the second diode is grounded;
the grid electrode of the third nonlinear element is connected with the first positive signal input end of the differential peak detector, the source electrode of the third nonlinear element is connected with the first negative signal input end of the differential peak detector, and the drain electrode of the third nonlinear element is connected with the signal output end of the differential peak detector; the grid of the fourth nonlinear element is connected with the second negative signal input end of the differential peak detector, the source of the fourth nonlinear element is connected with the second positive signal input end of the differential peak detector, and the drain of the fourth nonlinear element is connected with the signal output end of the differential peak detector.
The utility model also provides an electronic equipment, include as above difference formula millimeter wave communication framework.
The beneficial effects of the utility model reside in that: the oscillator outputs a base frequency signal, and then the base frequency signal is multiplied to a millimeter wave frequency band through the frequency multiplier, so that the design difficulty of the oscillator can be reduced, and the wireless communication with short distance and high data volume can be realized; the even harmonic generated by frequency multiplication of the frequency multiplier is counteracted through the first differential transformer, high-frequency impedance conversion is realized, and the signal switch of the power amplifier is controlled through the on-off keying signal, so that the modulation effect is achieved. The utility model discloses utilize the millimeter wave to have the high bandwidth advantage naturally, adopt OOK modulation technique to realize the short distance channel communication simultaneously, can simplify whole millimeter wave front end circuit in a large number to reach the characteristics of low-power consumption and small area.
Drawings
FIG. 1 is a schematic diagram of a superheterodyne amplitude modulation receiving circuit in the prior art;
fig. 2 is a schematic structural diagram of a transmitting device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a frequency multiplier according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power amplifier according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a signal waveform corresponding to each port of a power amplifier according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a receiving device according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a differential peak detector according to a first embodiment of the present invention;
fig. 8 is a schematic diagram of a signal waveform corresponding to each port of the differential peak detector according to the first embodiment of the present invention;
fig. 9 is a schematic diagram of a simulation result according to the first embodiment of the present invention.
Description of reference numerals:
100. a transmitting device; 200. a receiving device;
101. an oscillator; 102. a frequency multiplier; 103. a first differential transformer; 104. a driver amplifier; 105. a second differential transformer; 106. a power amplifier; 107. a third differential transformer;
201. a fourth differential transformer; 202. a low noise amplifier; 203. a fifth differential transformer; 204. differential peak detector.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
The noun explains:
oscillator (oscillator): electronic components for generating repetitive electronic signals (usually sine waves or square waves), electronic circuits or devices capable of converting direct current into alternating current signals with a certain frequency and outputting the signals; simply, it is a frequency source, and is generally used in a Phase Locked Loop (PLL).
Band stop filters (BSF for short): a filter that passes most of the frequency components, but attenuates certain ranges of frequency components to a very low level, as opposed to the concept of a band pass filter.
Harmonic waves: refers to a signal having a frequency higher than the primary signal frequency (i.e., the fundamental frequency).
Odd harmonic (Odd harmonic): when the frequency of the harmonic signal is odd times of the frequency of the fundamental wave signal, the harmonic is called an odd harmonic, namely the harmonic with the rated frequency being odd times of the frequency of the fundamental wave.
Even harmonic (even harmonic): the nominal frequency is a harmonic of an even multiple of the fundamental frequency.
A peak detector (Envelope detector), i.e. an Envelope detector. Envelope detection is amplitude detection, and by connecting peak points of a high-frequency signal for a certain time length, an upper (positive) line and a lower (negative) line can be obtained, and the two lines are called envelope lines. The envelope is a curve reflecting the amplitude variation of the high frequency signal.
OOK (on-off key) modulation, also known as binary amplitude keying (2ASK), uses a unipolar non-return-to-zero code sequence to control the on and off of a sinusoidal carrier. OOK is a special case of ASK (amplitude shift keying) modulation, which is based on the principle that one amplitude is taken as 0 and the other amplitude is taken as non-0.
Referring to fig. 2, a differential millimeter wave communication architecture includes a transmitter, where the transmitter includes an oscillator, a frequency multiplier, a first differential transformer, at least one driving amplifier circuit, and at least one power amplifier circuit, which are connected in sequence; the drive amplifier circuit comprises a drive amplifier and a second differential transformer which are connected in sequence, the power amplifier circuit comprises a power amplifier and a third differential transformer which are connected in sequence, the power amplifier comprises a signal switch, and the signal switch is connected with an on-off keying signal input end.
From the above description, the beneficial effects of the present invention are: the millimeter wave front end circuit with low power consumption and small area can be realized.
Further, the signal switch is connected to a virtual ground node.
As can be seen from the above description, by using the differential circuit design, the signal switch of the power amplifier is connected to the virtual ground of the differential circuit, so that the common mode noise caused by the switching of the signal switch can be cancelled in the differential circuit, and the noise can be prevented from interfering with the characteristics of the front-end circuit.
Furthermore, a positive signal output end of the oscillator is connected with a positive signal input end of the frequency multiplier, and a negative signal output end of the oscillator is connected with a negative signal input end of the frequency multiplier;
a positive signal output end of the frequency multiplier is connected with one end of the primary coil of the first differential transformer, and a negative signal output end of the frequency multiplier is connected with the other end of the primary coil of the first differential transformer;
one end of a secondary coil of the first differential transformer is connected with a positive electrode signal input end of a driving amplifier in the first driving amplification circuit, and the other end of the secondary coil of the first differential transformer is connected with a negative electrode signal input end of the driving amplifier in the first driving amplification circuit;
the positive signal output end of the driving amplifier is connected with one end of a primary coil of a second differential transformer, and the negative signal output end of the driving amplifier is connected with the other end of the primary coil of the second differential transformer;
one end of a secondary coil of the second differential transformer is connected with a positive electrode signal input end of a driving amplifier in the next driving amplification circuit, and the other end of the secondary coil of the second differential transformer is connected with a negative electrode signal input end of the driving amplifier in the next driving amplification circuit;
one end of a secondary coil of a second differential transformer in the last drive amplifying circuit is connected with the positive electrode signal input end of the power amplifier, and the other end of the secondary coil of the second differential transformer in the last drive amplifying circuit is connected with the negative electrode signal input end of the power amplifier;
a positive signal output end of the power amplifier is connected with one end of the primary coil of the third differential transformer, and a negative signal output end of the power amplifier is connected with the other end of the primary coil of the third differential transformer;
one end of a secondary coil of the third differential transformer is connected with the transmitting end of the transmitting device, and the other end of the secondary coil of the third differential transformer is grounded.
Further, the frequency multiplier comprises a first nonlinear element, a second nonlinear element and a band-stop filter; the grid electrode of the first nonlinear element is connected with the positive electrode signal input end of the frequency multiplier, the drain electrode of the first nonlinear element is respectively connected with the positive electrode signal output end and one end of the band elimination filter, and the source electrode of the first nonlinear element is grounded; the grid electrode of the second nonlinear element is connected with the negative electrode signal input end of the frequency multiplier, the drain electrode of the second nonlinear element is respectively connected with the negative electrode signal output end of the frequency multiplier and the other end of the band elimination filter, and the source electrode of the second nonlinear element is grounded.
It can be known from the above description that after the frequency multiplier receives the fundamental frequency signal generated by the oscillator, the first nonlinear element and the first nonlinear element generate odd harmonics and even harmonics, the band elimination filter filters the odd harmonics with preset multiples, the even harmonics are cancelled by the first differential transformer, and the remaining odd harmonics can be output to the amplifying circuit for frequency multiplication.
Further, the first nonlinear element and the second nonlinear element are field effect transistors, bipolar junction transistors, heterojunction bipolar transistors or field effect transistors.
Further, the power amplifier comprises a first active device, a second active device and a signal switch, wherein the signal switch is a switching tube; the grid electrode of the first active device is connected with the positive electrode signal input end of the power amplifier, and the drain electrode of the first active device is connected with the positive electrode signal output end of the power amplifier; the grid electrode of the second active device is connected with the negative electrode signal input end of the power amplifier, and the drain electrode of the second active device is connected with the negative electrode signal output end of the power amplifier; the source electrode of the first active device and the source electrode of the second active device are respectively connected with the drain electrode of the switching tube; the grid electrode of the switch tube is connected with the on-off keying signal input end, and the source electrode is grounded; the source of the switch tube is connected with the virtual ground node.
As can be seen from the above description, the first active device and the second active device are power amplifiers, the on-off keying signal input terminal can input the on-off keying signal to control the switching transistor, and both the noise and the non-ideal effect caused by the switching transistor are suppressed by the virtual ground, so that the circuit characteristic loss is not caused. And after the input end and the on-off keying signal are mixed at the output end of the power amplifier, an OOK signal is synthesized at the transmitting end by using a third differential transformer.
The receiving device comprises a fourth differential transformer, a low noise amplifier, a fifth differential transformer and a differential peak detector which are connected in sequence; the fifth differential transformer includes one primary coil and two secondary coils.
As can be seen from the above description, after the receiving end receives the signal through the antenna, the receiving end first suppresses the noise through the fourth differential transformer, then amplifies the signal through the low-noise amplifier, then generates two sets of differential signals through the fifth differential transformer, and finally restores the digital signal through the differential peak detector.
Furthermore, one end of the primary coil of the fourth differential transformer is connected with the receiving end of the receiving device, and the other end of the primary coil of the fourth differential transformer is grounded; one end of a secondary coil of the fourth differential transformer is connected with the positive signal input end of the low noise amplifier, and the other end of the secondary coil of the fourth differential transformer is connected with the negative signal input end of the low noise amplifier;
a positive signal output end of the low-noise amplifier is connected with one end of the primary coil of the fifth differential transformer, and a negative signal output end of the low-noise amplifier is connected with the other end of the primary coil of the fifth differential transformer;
one end of a first secondary coil of the fifth differential transformer is connected with a first positive signal input end of the differential peak detector, and the other end of the first secondary coil of the fifth differential transformer is connected with a first negative signal input end of the differential peak detector; one end of a second secondary coil of the fifth differential transformer is connected with a second positive signal input end of the differential peak detector, and the other end of the second secondary coil of the fifth differential transformer is connected with a second negative signal input end of the differential peak detector.
Further, the differential peak detector comprises a first diode, a second diode, a third nonlinear element and a fourth nonlinear element;
one end of the first diode is connected with a first positive electrode signal input end of the differential peak detector, and the other end of the first diode is grounded; one end of the second diode is connected with a second negative signal input end of the differential peak detector, and the other end of the second diode is grounded;
the grid electrode of the third nonlinear element is connected with the first positive signal input end of the differential peak detector, the source electrode of the third nonlinear element is connected with the first negative signal input end of the differential peak detector, and the drain electrode of the third nonlinear element is connected with the signal output end of the differential peak detector; the grid of the fourth nonlinear element is connected with the second negative signal input end of the differential peak detector, the source of the fourth nonlinear element is connected with the second positive signal input end of the differential peak detector, and the drain of the fourth nonlinear element is connected with the signal output end of the differential peak detector.
As can be seen from the above description, the positive amplitude demodulation can be fully utilized by demodulating the positive amplitude through the third nonlinear element and the first diode, demodulating the negative amplitude through the fourth nonlinear element and the second diode, and finally superimposing the signal output at the signal output terminal.
The utility model also provides an electronic equipment, include as above difference formula millimeter wave communication framework.
Example one
Referring to fig. 2-9, a first embodiment of the present invention is: a differential communication structure can be applied to a mobile terminal, WiFi equipment or Bluetooth equipment to realize wireless communication with short distance and high data volume, and comprises a transmitting device and a receiving device which are connected in wireless communication.
As shown in fig. 2, the transmitting apparatus (TX Chain)100 includes an Oscillator (Oscillator)101, a Frequency multiplier (Frequency multiplier)102, a first differential transformer (TF _1)103, at least one driving amplifying circuit and at least one power amplifying circuit, which are connected in sequence; the driving amplification circuit comprises a driving amplifier 104 and a second differential transformer 105 which are connected in sequence; the Power amplification circuit includes a Power amplifier (Power amplifier stage)106 and a third differential transformer (TF _ N)107 connected in this order. In this embodiment, an example including two driving amplifier circuits will be described, in which AMP _1 and TF _2 are the first driving amplifier circuit, and AMP _2 and TF _3 are the second driving amplifier circuit. In a preferred embodiment, the number of driving amplification circuits is four. In other embodiments, the number of driving amplifying circuits may be other numbers.
Specifically, the positive signal output end of the oscillator 101 is connected with the positive signal input end In + of the frequency multiplier 102, and the negative signal output end of the oscillator 101 is connected with the negative signal input end In-of the frequency multiplier 102; a positive signal output end Out + of the frequency multiplier 102 is connected with one end of a primary coil of the first differential transformer 103, and a negative signal output end Out-of the frequency multiplier 102 is connected with the other end of the primary coil of the first differential transformer 103; one end of the secondary coil of the first differential transformer 103 is connected to the positive signal input terminal In + of the driving amplifier (AMP _1)104 In the first driving amplification circuit, and the other end of the secondary coil of the first differential transformer 103 is connected to the negative signal input terminal In-of the driving amplifier 104 In the first driving amplification circuit.
For other drive amplification circuits except the last drive amplification circuit, the positive signal output end Out + of the drive amplifier 104 is connected with one end of the primary coil of the second differential transformer 105, and the negative signal output end Out-of the drive amplifier 104 is connected with the other end of the primary coil of the second differential transformer 105; one end of the secondary coil of the second differential transformer 105 is connected to the positive signal input terminal In + of the driving amplifier 104 In the next driving amplification circuit, and the other end of the secondary coil of the second differential transformer 105 is connected to the negative signal input terminal In-of the driving amplifier 104 In the next driving amplification circuit.
One end of the secondary coil of the second differential transformer 105 In the last driving amplification circuit is connected with the positive signal input end In + of the power amplifier 106, and the other end of the secondary coil of the second differential transformer 105 In the last driving amplification circuit is connected with the negative signal input end In-of the power amplifier 106; a positive electrode signal output end Out + of the power amplifier 106 is connected with one end of a primary coil of the third differential transformer 107, and a negative electrode signal output end Out-of the power amplifier 106 is connected with the other end of the primary coil of the third differential transformer 107; the power amplifier 106 is also connected to the on-off keying signal input Digital input.
One end of the secondary coil of the third differential transformer 107 is connected to the transmitting terminal TX _ out of the transmitting apparatus 100, and the other end of the secondary coil of the third differential transformer 107 is grounded.
Further, as shown in fig. 3, the frequency multiplier includes a first nonlinear element M1, a second nonlinear element M2, and a band-stop filter BSF; the grid (gate) of the first nonlinear element M1 is connected with the positive signal input end In + of the frequency multiplier, the drain (drain) is respectively connected with the positive signal output end Out + and one end of the band-stop filter BSF, and the source (source) is grounded; the grid electrode of the second nonlinear element M2 is connected with the negative electrode signal input end In-of the frequency multiplier, the drain electrode of the second nonlinear element M2 is respectively connected with the negative electrode signal output end Out-of the frequency multiplier and the other end of the band elimination filter BSF, and the source electrode of the second nonlinear element M2 is grounded.
In this embodiment, the first nonlinear element M1 and the second nonlinear element M2 are field effect transistors MOS, bipolar junction transistors BJT, heterojunction bipolar transistors HBT, or field effect transistors FET.
In the transmitting device, an oscillator is used for generating a base frequency signal, and a frequency multiplier is used for multiplying the base frequency signal by frequency M to a millimeter wave frequency band. The length of the primary coil of the first differential transformer is M times of the length of the secondary coil of the first differential transformer; the primary coil of the first differential transformer matches the frequency of the fundamental frequency signal and the secondary coil matches the frequency of the fundamental frequency signal by a factor of M. In this embodiment, the frequency of the fundamental frequency signal generated by the oscillator is 20GHz, and M is 3, i.e., the frequency is doubled to 60 GHz. The primary coil of the first differential transformer achieves impedance matching at 20GHz and the secondary coil achieves impedance matching at 60 GHz.
Specifically, after the positive signal input terminal In + and the negative signal input terminal In-of the frequency multiplier receive the fundamental frequency signal generated by the oscillator, the odd harmonic (In phase with the fundamental frequency signal) and the even harmonic (In phase with the fundamental frequency signal) are generated by the first nonlinear element M1 and the second nonlinear element M2.
Since the transformer is differential (reverse-adding) and the even harmonic is in phase with the fundamental signal, the even harmonic is cancelled by the first differential transformer TF _ 1. Meanwhile, the stop band range of the band elimination filter is designed to be preset odd times of the frequency of the fundamental frequency signal, therefore, the band elimination filter can filter out odd harmonics of the preset odd times of frequency, and the remaining odd harmonics can be output to the amplifying circuit for frequency multiplication. Since the amplifier does not amplify signals of excessive frequency, it only amplifies odd harmonics of a frequency that is a specific odd multiple of the frequency of the fundamental signal.
In this embodiment, the stop band range of the band-stop filter is designed at the frequency of the odd harmonic with the minimum frequency, i.e. 1 time of the frequency of the fundamental frequency signal, i.e. the frequency of the fundamental frequency signal generated by the oscillator, so that the band-stop filter can filter out the odd harmonic with the frequency of 1 time of the frequency of the fundamental frequency signal, and the odd harmonic with the frequency of other odd times of the frequency of the fundamental frequency signal can be output to the amplifying circuit for amplification. In this embodiment, the amplifier amplifies only odd harmonics having a frequency 3 times the frequency of the fundamental frequency signal.
Further, as shown in fig. 4, the power amplifier includes a first active device M3, a second active device M4, and a signal switch connected to the virtual ground node. In this embodiment, the signal switch is a (digital signal) switch tube (SWT) M5; the grid electrode of the first active device M3 is connected with the positive electrode signal input end In + of the power amplifier, and the drain electrode is connected with the positive electrode signal output end Out + of the power amplifier; the grid electrode of the second active device M4 is connected with the negative electrode signal input end In-of the power amplifier, and the drain electrode of the second active device M4 is connected with the negative electrode signal output end Out-of the power amplifier; the drain electrode of the switching tube M5 is respectively connected with the source electrode of the first active device M3 and the source electrode of the second active device M4, the grid electrode is connected with an on-off keying signal input end Digital input, and the source electrode is grounded; meanwhile, the drain of the switch tube M5 is equivalent to Virtual ground (Virtual GND). The virtual ground does not affect the circuit when the signal switch M5 switches.
In this embodiment, the first active device M3 and the second active device M4 are used to amplify signals, and amplify millimeter wave signals to a preset index. In this embodiment, the first active device M3 and the second active device M4 may be field effect transistors MOS, bipolar junction transistors BJT, heterojunction bipolar transistors HBT, or field effect transistors FET.
Fig. 5 shows signal waveforms corresponding to the ports of the power amplifier and signal waveforms corresponding to the transmitting end, and it can be seen that, after the output ends Out + and Out-of the power amplifier mix signals input by the input ends In + and In-and signals input by the input ends of the on-off keying signals, the OOK signals are differentially synthesized at the transmitting end TX _ Out by using the third differential transformer TF _ N. Finally, the signal is transmitted out through the antenna at the transmitting end TX _ out.
The third differential transformer has the same function as the first differential transformer and the second differential transformer, and both realize impedance matching.
As shown in fig. 6, the receiving apparatus (RX Chain)200 includes a fourth differential transformer 201, a low noise amplifier 202, a fifth differential transformer 203, and a differential peak detector 204, which are connected in this order. The fifth differential transformer 203 includes a primary winding and two secondary windings, and generates two sets of differential signals according to the input signal.
Specifically, one end of the primary coil of the fourth differential transformer (RX _ TF _1)201 is connected to the receiving end of the receiving apparatus 200, and the other end of the primary coil of the fourth differential transformer 201 is grounded; one end of the secondary coil of the fourth differential transformer 201 is connected to a positive signal input terminal In + of a low noise amplifier (VGLNA)202, and the other end of the secondary coil of the fourth differential transformer 201 is connected to a negative signal input terminal In-of the low noise amplifier 202; a positive electrode signal output end Out + of the low noise amplifier 202 is connected with one end of a primary coil of the fifth differential transformer (RX _ Dual _ TF)203, and a negative electrode signal output end Out-of the low noise amplifier 202 is connected with the other end of the primary coil of the fifth differential transformer 203; one end of a first secondary coil of the fifth differential transformer 203 is connected to a first positive signal input end ENV _ in1+ of the differential peak detector (Envelope detector)204, and the other end is connected to a first negative signal input end ENV _ in 1-of the differential peak detector 204; one end of the second secondary coil of the fifth differential transformer 203 is connected to the second positive signal input end ENV _ in2+ of the differential peak detector 204, and the other end is connected to the second negative signal input end ENV _ in 2-of the differential peak detector 204.
In the receiving device, after a receiving end receives a signal through an antenna, noise is firstly suppressed through a fourth differential transformer (RX _ TF _1), then the signal is amplified through a low noise amplifier (VGLNA), then two groups of differential signals ENV _ in1+ and ENV _ in 1-and ENV _ in 2-and ENV _ in2+ are generated through a fifth differential transformer (RX _ Dual _ TF), and finally the signal is demodulated through a differential peak detector (Envelope detector), and a digital signal is restored.
Further, as shown in fig. 7, the differential peak detector includes a first diode D1, a second diode D2, a third nonlinear element M6, and a fourth nonlinear element M7; one end of a first diode D1 is connected with a first positive electrode signal input end ENV _ in1+ of the differential peak detector, and the other end of the first diode D1 is grounded; the grid electrode of the third nonlinear element M6 is connected with a first positive electrode signal input end ENV _ in1+ of the differential type peak detector, the source electrode is connected with a first negative electrode signal input end ENV _ in 1-of the differential type peak detector, and the drain electrode is connected with a signal output end ENV _ out of the differential type peak detector; one end of a second diode D2 is connected with a second negative signal input end ENV _ in 2-of the differential peak detector, and the other end is grounded; the gate of the fourth nonlinear element M7 is connected to the second negative signal input end ENV _ in2-, the source is connected to the second positive signal input end ENV _ in2+, and the drain is connected to the signal output end ENV _ out of the differential peak detector.
In this embodiment, the third nonlinear element M6 and the fourth nonlinear element M7 are used to integrate the signals, add the differential signals in anti-phase, and then increase the signal amplitude, thereby making it easier to detect the peak values of the first diode D1 and the second diode D2. In the present embodiment, the third nonlinear element M6 and the fourth nonlinear element M7 can be field effect transistors MOS, bipolar junction transistors BJT, heterojunction bipolar transistors HBT, or field effect transistors FET.
As shown in fig. 8, the differential peak detector has signal waveforms corresponding to the respective ports, and in the differential peak detector, the third nonlinear element M6 and the first diode D1 demodulate the positive amplitude of (ENV _ in1+) - (ENV _ in1-), and the fourth nonlinear element M7 and the second diode D2 demodulate the negative amplitude of (ENV _ in2-) - (ENV _ in2+), and finally superimpose and output the signal at the signal output terminal ENV _ out. The differential peak detector can fully utilize the positive amplitude and the negative amplitude for demodulation, and half of energy is not wasted.
The simulation results of this embodiment are shown in fig. 9, where the simulation includes the physical transmitting device TX Chain signal channel and the receiving device RX Chain, and it can be seen from the figure that the OOK signal can be successfully demodulated at the RX output.
In the embodiment, a local oscillation source generates an output signal source, the output signal drives a group of frequency multipliers to multiply the frequency of the signal to a millimeter wave band, and a digital signal (on-off keying signal) directly drives a switch of a power amplifier to achieve the effect of modulation. Because OOK (ON-OFF key) modulation technology is adopted, commercial specifications do not need to be met, protocol layer base frequency circuits (MAC layers and PHY layers) are not needed, and because OOK modulation technology only needs to realize ON/OFF, the requirement ON frequency precision is not high (the frequency of the embodiment only needs to be 60GHz, and does not need to use a standard frequency channel as the frequency of WiFi needing 2.4152 GHz), so that a phase-locked loop (PLL) is not needed, meanwhile, because the millimeter wave frequency band is in a high-frequency band, interference is difficult to generate with other systems, and an additional filter is not needed to filter the interference.
Because the whole circuit adopts a differential circuit design, a signal switch of the power amplifier is at a Virtual ground (Virtual GND) of the differential circuit, so that common mode noise (common mode noise) caused by switching of the signal switch can be counteracted in the differential circuit, namely, noise and non-ideal effect caused by a switch tube are inhibited by the Virtual ground, and the characteristic loss of the circuit cannot be caused. The frequency multiplier cancels all even harmonics by using a differential circuit, extracts harmonics with higher-order frequency, and realizes high-frequency impedance conversion by using a first differential transformer TF _ 1. In a low noise amplifier, common mode noise can be cancelled. The differential peak detector can detect the positive and negative amplitudes (amplitudes) of the signal 1 and superimpose the signals on the output to avoid loss of signal Amplitude for maximum efficiency.
The embodiment utilizes the advantage of high bandwidth inherent in millimeter waves, and simultaneously adopts an OOK (on-off key) modulation technology to realize short-distance channel communication, so that the whole millimeter wave front-end circuit can be greatly simplified, compared with the existing circuit shown in fig. 1, a phase-locked loop (PLL) and a frequency mixer are not needed, even a digital-to-analog conversion circuit is not needed, and an additional filter is not needed, so that the characteristics of low power consumption and small area can be achieved.
To sum up, the utility model provides a differential millimeter wave communication architecture and electronic equipment, through oscillator output fundamental frequency signal, then frequency multiplier with fundamental frequency signal doubling to millimeter wave frequency channel, can reduce the design degree of difficulty of oscillator, and be favorable to realizing the wireless communication of short distance and high data volume; the even harmonic generated by frequency multiplication of the frequency multiplier is counteracted through the first differential transformer, high-frequency impedance conversion is realized, and the signal switch of the power amplifier is controlled through the on-off keying signal, so that the modulation effect is achieved. By adopting the differential circuit design, the signal switch of the power amplifier is connected to the virtual ground of the differential circuit, so that the common-mode noise caused by the switching of the signal switch can be offset in the differential circuit, and the noise is prevented from interfering the characteristics of the front-end circuit. The utility model discloses can simplify whole millimeter wave front end circuit in a large number to reach the characteristics of low-power consumption and small area, and can avoid noise interference front end circuit characteristic.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (10)
1. A differential millimeter wave communication architecture is characterized by comprising a transmitting device, wherein the transmitting device comprises an oscillator, a frequency multiplier, a first differential transformer, at least one driving amplifying circuit and at least one power amplifying circuit which are sequentially connected; the drive amplifier circuit comprises a drive amplifier and a second differential transformer which are connected in sequence, the power amplifier circuit comprises a power amplifier and a third differential transformer which are connected in sequence, the power amplifier comprises a signal switch, and the signal switch is connected with an on-off keying signal input end.
2. The differential millimeter wave communication architecture defined in claim 1, wherein the signal switch is connected to a virtual ground node.
3. The differential millimeter wave communication architecture of claim 1 or 2, wherein a positive signal output terminal of the oscillator is connected to a positive signal input terminal of the frequency multiplier, and a negative signal output terminal of the oscillator is connected to a negative signal input terminal of the frequency multiplier;
a positive signal output end of the frequency multiplier is connected with one end of the primary coil of the first differential transformer, and a negative signal output end of the frequency multiplier is connected with the other end of the primary coil of the first differential transformer;
one end of a secondary coil of the first differential transformer is connected with a positive electrode signal input end of a driving amplifier in the first driving amplification circuit, and the other end of the secondary coil of the first differential transformer is connected with a negative electrode signal input end of the driving amplifier in the first driving amplification circuit;
the positive signal output end of the driving amplifier is connected with one end of a primary coil of a second differential transformer, and the negative signal output end of the driving amplifier is connected with the other end of the primary coil of the second differential transformer;
one end of a secondary coil of the second differential transformer is connected with a positive electrode signal input end of a driving amplifier in the next driving amplification circuit, and the other end of the secondary coil of the second differential transformer is connected with a negative electrode signal input end of the driving amplifier in the next driving amplification circuit;
one end of a secondary coil of a second differential transformer in the last drive amplifying circuit is connected with the positive electrode signal input end of the power amplifier, and the other end of the secondary coil of the second differential transformer in the last drive amplifying circuit is connected with the negative electrode signal input end of the power amplifier;
a positive signal output end of the power amplifier is connected with one end of the primary coil of the third differential transformer, and a negative signal output end of the power amplifier is connected with the other end of the primary coil of the third differential transformer;
one end of a secondary coil of the third differential transformer is connected with the transmitting end of the transmitting device, and the other end of the secondary coil of the third differential transformer is grounded.
4. The differential millimeter wave communication architecture of claim 3, wherein the frequency multiplier comprises a first nonlinear element, a second nonlinear element, and a band-stop filter; the grid electrode of the first nonlinear element is connected with the positive electrode signal input end of the frequency multiplier, the drain electrode of the first nonlinear element is respectively connected with the positive electrode signal output end and one end of the band elimination filter, and the source electrode of the first nonlinear element is grounded; the grid electrode of the second nonlinear element is connected with the negative electrode signal input end of the frequency multiplier, the drain electrode of the second nonlinear element is respectively connected with the negative electrode signal output end of the frequency multiplier and the other end of the band elimination filter, and the source electrode of the second nonlinear element is grounded.
5. The differential millimeter wave communication architecture of claim 4, wherein the first and second nonlinear elements are field effect transistors, bipolar junction transistors, heterojunction bipolar transistors, or field effect transistors.
6. The differential millimeter wave communication architecture of claim 3, wherein the power amplifier comprises a first active device, a second active device and a signal switch, and the signal switch is a switching tube; the grid electrode of the first active device is connected with the positive electrode signal input end of the power amplifier, and the drain electrode of the first active device is connected with the positive electrode signal output end of the power amplifier; the grid electrode of the second active device is connected with the negative electrode signal input end of the power amplifier, and the drain electrode of the second active device is connected with the negative electrode signal output end of the power amplifier; the source electrode of the first active device and the source electrode of the second active device are respectively connected with the drain electrode of the switching tube; the grid electrode of the switch tube is connected with the on-off keying signal input end, and the source electrode is grounded; the source of the switch tube is connected with the virtual ground node.
7. The differential millimeter wave communication architecture of claim 1 or 2, further comprising a receiving device, wherein the receiving device comprises a fourth differential transformer, a low noise amplifier, a fifth differential transformer and a differential peak detector connected in sequence; the fifth differential transformer includes one primary coil and two secondary coils.
8. The differential millimeter wave communication architecture of claim 7, wherein one end of the primary coil of the fourth differential transformer is connected to the receiving end of the receiving device, and the other end of the primary coil of the fourth differential transformer is grounded; one end of a secondary coil of the fourth differential transformer is connected with the positive signal input end of the low noise amplifier, and the other end of the secondary coil of the fourth differential transformer is connected with the negative signal input end of the low noise amplifier;
a positive signal output end of the low-noise amplifier is connected with one end of the primary coil of the fifth differential transformer, and a negative signal output end of the low-noise amplifier is connected with the other end of the primary coil of the fifth differential transformer;
one end of a first secondary coil of the fifth differential transformer is connected with a first positive electrode signal input end of the differential wave crest detector, and the other end of the first secondary coil of the fifth differential transformer is connected with a first negative electrode signal input end of the differential wave crest detector; one end of a second secondary coil of the fifth differential transformer is connected with a second positive signal input end of the differential peak detector, and the other end of the second secondary coil of the fifth differential transformer is connected with a second negative signal input end of the differential peak detector.
9. The differential millimeter wave communication architecture of claim 8, wherein the differential peak detector comprises a first diode, a second diode, a third nonlinear element, and a fourth nonlinear element;
one end of the first diode is connected with a first positive electrode signal input end of the differential wave crest detector, and the other end of the first diode is grounded; one end of the second diode is connected with a second negative signal input end of the differential peak detector, and the other end of the second diode is grounded;
the grid electrode of the third nonlinear element is connected with the first positive signal input end of the differential peak detector, the source electrode of the third nonlinear element is connected with the first negative signal input end of the differential peak detector, and the drain electrode of the third nonlinear element is connected with the signal output end of the differential peak detector; the grid of the fourth nonlinear element is connected with the second negative signal input end of the differential peak detector, the source of the fourth nonlinear element is connected with the second positive signal input end of the differential peak detector, and the drain of the fourth nonlinear element is connected with the signal output end of the differential peak detector.
10. An electronic device comprising the differential millimeter wave communication architecture of any of claims 1 to 9.
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