CN106936429A - Local oscillator and local oscillated signal production method - Google Patents
Local oscillator and local oscillated signal production method Download PDFInfo
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- CN106936429A CN106936429A CN201710132450.XA CN201710132450A CN106936429A CN 106936429 A CN106936429 A CN 106936429A CN 201710132450 A CN201710132450 A CN 201710132450A CN 106936429 A CN106936429 A CN 106936429A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/66—Phase shifters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
The invention provides a kind of local oscillator and local oscillated signal production method, the output end of voltage controlled oscillator is connected with the input of RC CR phase-shift networks, the input of two output ends of RC CR phase-shift networks and the first frequency dividing circuit, the input of the second frequency dividing circuit, the first input end of image-reject mixer are connected, the output end of the output end of the first frequency dividing circuit or the second frequency dividing circuit is connected with the second input of image-reject mixer, and the output end of image-reject mixer is connected with the input of Divide-by-3 circuit.The scheme that Frequency mixing processing is carried out after first producing orthogonal signalling produces local oscillated signal, for local oscillated signal is produced using the scheme for first carrying out producing after Frequency mixing processing orthogonal signalling, the output signal frequency of image-reject mixer and the frequency of local oscillated signal are different in the present invention, improve the output signal frequency of image-reject mixer, so as to reduce the area that inductance takes chip, production cost is effectively reduced.
Description
Technical field
The present invention relates to technical field of electronic communication, more particularly to a kind of local oscillator and local oscillated signal generation side
Method.
Background technology
Voltage controlled oscillator (VCO) is used as the original frequency signal source of local oscillator (LO), so as to wirelessly or non-wirelessly
Channel on transmitting and/or receive information.Because voltage controlled oscillator has higher transmission frequency, the high frequency of " pure " is hardly produced
Signal.Noise on LO can mix with obstruction (blocker) signal makes receiver insensitive.When realization is supported in one single chip
During the various transceivers of different frequency bands, this is even more a kind of challenge.For example, the unnecessary spectral audio (spectral tone) of LO
The receiver section of another transceiver can be disturbed.
The production method of existing LO signals mainly includes that mirror image suppresses frequency mixing method.As shown in figure 1, it is existing local
The structural representation of oscillator.The local oscillator suppresses mixing scheme using mirror image, and the local oscillator includes：One is voltage-controlled
Oscillator (VCO), three buffers, an image-reject mixer, three remove 2 circuits, two RC-CR phase-shift networks, it is voltage-controlled to shake
It is the signal of Wc to swing device generation frequency, and frequency is transferred to one except 2 circuits for the signal of Wc by two buffer Shape corrections
It is the signal of 0.5Wc to produce frequency, and two orthogonal signalling of frequency component of image-reject mixer input remove 2 circuits by two
Output produce, frequency is respectively 0.5Wc and 0.25Wc, is the letter of 0.75Wc by producing frequency after image-reject mixer
Number, afterwards by producing frequency to be all the four tunnel orthogonal signalling (IQ) of 0.75Wc by RC-CR again after remaining buffer.But
It is, because the output of the last four tunnel orthogonal signalling and image-reject mixer for producing is all in frequency 0.75Wc frequencies, if
This frequency be not it is very high if (such as 0.75Wc=2.4GHz), according to inductance capacitance resonance equation：Understand, when
The inductance value of preceding needs, so as to cause inductance to take larger chip area, will increased production cost than larger.
The content of the invention
It is an object of the invention to provide a kind of local oscillator and local oscillated signal production method, to solve using existing
Have using mirror image suppress mixing scheme local oscillator, it is necessary to inductance value it is larger, cause inductance to take larger chip face
Product, increased the problem of production cost.
In order to solve the above technical problems, the present invention provides a kind of local oscillator, the local oscillator includes：One is voltage-controlled
Oscillator, two RC-CR phase-shift networks, one first frequency dividing circuit, one second frequency dividing circuit, a Divide-by-3 circuit and a mirror images
Suppress frequency mixer；The output end of the voltage controlled oscillator is connected with the input of the RC-CR phase-shift networks, described two RC-
Input, the input of second frequency dividing circuit, the mirror of the output end of CR phase-shift networks and first frequency dividing circuit
First input end connection as suppressing frequency mixer, the output of the output end of first frequency dividing circuit or second frequency dividing circuit
End be connected with the second input of the image-reject mixer, the output end of the image-reject mixer with described 3rd point
The input connection of frequency circuit.
Optionally, in described local oscillator, also including the first buffer cell, the second buffer cell and the 3rd buffering
Unit, the input of first buffer cell is connected with the output end of the voltage controlled oscillator, first buffer cell
Output end is connected with the input of described two RC-CR phase-shift networks；The input of second buffer cell with it is described two
The output end connection of RC-CR phase-shift networks, the input of the output end of second buffer cell and first frequency dividing circuit,
The input connection of second frequency dividing circuit；The input of the 3rd buffer cell is defeated with the image-reject mixer
Go out end connection, the output end of the 3rd buffer cell is connected with the input of the Divide-by-3 circuit.
Optionally, in described local oscillator, also including correction resistance, the correction resistance is by switching control
Mode is parallel to the two ends of resistance in RC-CR phase-shift networks.
Optionally, in described local oscillator, the quantity of the correction resistance is two groups, and every group of correction resistance passes through
The mode of the switch control of some bit wides is parallel to a two ends for resistance in RC-CR phase-shift networks.
Optionally, in described local oscillator, first frequency dividing circuit, second frequency dividing circuit and described
Divide-by-3 circuit is except 2 circuits.
Optionally, in described local oscillator, the voltage controlled oscillator generates the signal of first frequency.
Optionally, in described local oscillator, the signal for being input into the image-reject mixer includes four tunnels first
The orthogonal signalling of the orthogonal signalling of frequency and four road second frequencies, the output signal of the Divide-by-3 circuit is local oscillations letter
Number, the first frequency is two times of the second frequency.
Optionally, in described local oscillator, the signal frequency of the signal of the image-reject mixer output is
1.5 times of first frequency, the signal frequency of the local oscillated signal is 0.75 times of first frequency.
The present invention also provides a kind of local oscillated signal production method, and the local oscillated signal production method uses above-mentioned
Local oscillator is produced.
Optionally, in described local oscillated signal production method, including：
The frequency of oscillation of the frequency setting voltage controlled oscillator according to the local oscillated signal to be produced, the first frequency dividing electricity
Road, second frequency dividing circuit and the Divide-by-3 circuit are during except 2 circuit, the frequency of the local oscillated signal to be produced
Rate is 0.75 times of the frequency of oscillation of voltage controlled oscillator.
In local oscillator provided by the present invention and local oscillated signal production method, the output end of voltage controlled oscillator
Input with RC-CR phase-shift networks is connected, the input of two output ends of RC-CR phase-shift networks and the first frequency dividing circuit,
The first input end connection of the input of the second frequency dividing circuit, image-reject mixer, the output end of the first frequency dividing circuit or the
The output end of frequency-halving circuit is connected with the second input of image-reject mixer, the output end of image-reject mixer and the
The input connection of Divide-by-3 circuit.The scheme that Frequency mixing processing is carried out after first producing orthogonal signalling produces local oscillations letter
Number, for local oscillated signal is produced using the scheme for first carrying out producing after Frequency mixing processing orthogonal signalling, mirror in the present invention
As the output signal frequency for suppressing frequency mixer is different from the frequency of local oscillated signal, the output of image-reject mixer is improve
Signal frequency, so as to reduce the area that inductance takes chip, effectively reduces production cost.
Brief description of the drawings
Fig. 1 is the structural representation of existing local oscillator；
Fig. 2 is the structural representation of local oscillator in one embodiment of the invention；
Fig. 3 a are the response curve of the amplitude with frequency of RC-CR phase-shift networks in one embodiment of the invention；
Fig. 3 b are the response curve of the phase with frequency of RC-CR phase-shift networks in one embodiment of the invention；
Fig. 4 is the schematic diagram for increasing the RC-CR phase-shift networks after correction resistance in one embodiment of the invention；
Fig. 5 is the schematic diagram of image-reject mixer；
Fig. 6 is the circuit diagram of image-reject mixer.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to local oscillator proposed by the present invention and local oscillated signal generation side
Method is described in further detail.According to following explanation and claims, advantages and features of the invention will become apparent from.Need explanation
, accompanying drawing in the form of simplifying very much and uses non-accurately ratio, is only used to conveniently, lucidly aid in illustrating originally
The purpose of inventive embodiments.
Fig. 2 is refer to, it is the structural representation of local oscillator in the present embodiment, as shown in Fig. 2 the local oscillations
Device includes：One voltage controlled oscillator (VCO), two RC-CR phase-shift networks (also referred to as RC-CR networks), one first frequency dividing circuit, one
Frequency-halving circuit, a Divide-by-3 circuit and an image-reject mixer；The output end of the voltage controlled oscillator and the RC-CR
The input connection of phase-shift network, the input of the output end of described two RC-CR phase-shift networks and first frequency dividing circuit,
The first input end connection of the input, the image-reject mixer of second frequency dividing circuit, first frequency dividing circuit
Output end or the output end of second frequency dividing circuit be connected with the second input of the image-reject mixer, the mirror
As the output end for suppressing frequency mixer is connected with the input of the Divide-by-3 circuit.Preferably, first frequency dividing circuit, institute
State the second frequency dividing circuit and the Divide-by-3 circuit is except 2 circuits.Preferably, first frequency dividing circuit, described second
Frequency dividing circuit, the Divide-by-3 circuit include but is not limited to be except 2 circuits, or except 4 circuits or except 6 circuits.
Further, local oscillator also includes the first buffer cell, the second buffer cell and the 3rd buffer cell, described
The input of the first buffer cell is connected with the output end of the voltage controlled oscillator, the output end of first buffer cell and institute
State two input connections of RC-CR phase-shift networks；The input of second buffer cell and described two RC-CR phase shifts nets
The output end connection of network, the input of the output end of second buffer cell and first frequency dividing circuit, described second point
The input connection of frequency circuit；The input of the 3rd buffer cell is connected with the output end of the image-reject mixer,
The output end of the 3rd buffer cell is connected with the input of the Divide-by-3 circuit.
Specifically, as shown in Fig. 2 the first buffer cell includes two buffers, the input of each buffer and institute
The output end connection of voltage controlled oscillator is stated, the output end of each buffer is connected with the input of a RC-CR network, so that just
Walk carries out waveform shaping to the signal of voltage controlled oscillator output；Second buffer cell includes four buffers, each RC-CR network
Include a CR circuit and a RC circuit, the output end correspondence and of CR circuits and RC circuits in each RC-CR network
Individual buffer connection, waveform shaping is carried out with to the signal that every road exports, and further improves the quality of output signal, improves output
The jamproof ability of signal；3rd buffer cell includes a buffer, for the letter exported to image-reject mixer
Number carry out waveform shaping.To sum up, the output end of each device can follow one buffer of design, so that after being processed through each device
Signal quality be all optimal, improve its jamproof ability while the quality for improving signal waveform, it is ensured that final to produce
Local oscillated signal quality.
In order to be better understood from image-reject mixer, it is described in detail below in conjunction with Fig. 5 and Fig. 6.
Fig. 5 is refer to, it is the schematic diagram of image-reject mixer in the present embodiment.Principle shown in Fig. 5 can be as follows
Formula is characterized：
Sin (Wa*t) * cos (Wb*t)=0.5 (sin (Wa+Wb) * t+sin (Wa-Wb) * t)；
Cos (Wa*t) * sin (Wb*t)=0.5 (sin (Wa+Wb) * t-sin (Wa-Wb) * t)；
Sin (Wa*t) * cos (Wb*t)+cos (Wa*t) * sin (Wb*t)=sin (Wa+Wb) * t.
Wherein Wa, Wb are respectively the different frequency of numerical value.
Fig. 6 is refer to, it is the circuit diagram of image-reject mixer in the present embodiment.In Fig. 6, Ibias is current source, M1
~M4 is mutual conductance pipe, and it is Wb's (signal frequency of the first input end input of correspondence image-reject mixer) that M1~M4 connects frequency
Orthogonal signalling, M5~M12 is switching tube, and it is Wa (the second inputs of correspondence image-reject mixer that wherein M5~M8 connects frequency
The signal frequency of input) I roads differential signal, M9~M12 connect frequency be Wb Q roads differential signal.Inductance L and electric capacity C resonance
In frequency (Wa+Wb), such OUTN and OUTP is the differential signal that frequency is (Wa+Wb).
Please continue to refer to Fig. 2, Fig. 5 and Fig. 6, in Wc frequencies, Wc can be with for voltage controlled oscillator (VCO) vibration in the present embodiment
Set according to the actual requirements, the oscillator signal of the difference of voltage controlled oscillator output gives two by the first buffer cell
RC-CR phase-shift networks, it is the orthogonal signalling of Wc that two RC-CR phase-shift networks produce 4 tunnel frequencies, and this 4 tunnel frequency is orthogonal for Wc's
Respectively by a corresponding buffer, 4 tunnel frequencies of output are the differential signal of Wc to signal, by I roads differential signal (corresponding diagram 2
Middle signal cos (Wc*t) and-cos (Wc*t)) give the first orthogonal signalling (i.e. cos that 0.5Wc frequencies are produced except 2 circuits
(0.5Wc*t) ,-cos (0.5Wc*t)), and the first input end of image-reject mixer is given, will wherein Q roads difference letter
Number (signal sin (Wc*t) and-sin (Wc*t) in corresponding diagram 2) gives the second orthogonal signalling that 0.5Wc frequencies are produced except 2 circuits
(i.e. sin (0.5Wc*t) ,-sin (0.5Wc*t)) and the first input end of image-reject mixer is given, to balance I roads
With the load on Q roads.The signal of the second input input of the image-reject mixer is two RC-CR phase-shift networks output letters
Number by frequency after waveform shaping for Wc orthogonal signalling (correspondence in signal sin (Wc*t) ,-sin (Wc*t), cos (Wc*t)
With-cos (Wc*t).It is respectively through two frequency components of first input end and the second input input image-reject mixer
The orthogonal signalling of 0.5Wc and Wc by after Frequency mixing processing produce 1.5Wc frequencies differential signal, then by the 3rd buffer cell
Giving the 3rd amplitude and phase for being produced except 2 circuits in 0.75Wc frequencies afterwards, to match good phase local oscillating signal (right
Answer I_P, I_N, Q_P, Q_N in Fig. 2).
Compared to the existing local oscillator structure shown in Fig. 1, local oscillator structure shown in Fig. 2 is in RC-CR phase shift nets
The position that network is set is present is changed, and based on the change, the setting of corresponding subsequent device and connection are changed.Fig. 1
Two frequency components of middle input image-reject mixer are respectively 0.5Wc and 0.25Wc, the letter of image-reject mixer output
Number for frequency for 0.75Wc differential signal；And it is preposition because of RC-CR networks in Fig. 2 so that input image-reject mixer
Two frequency components are respectively 0.5Wc and Wc, the differential signal of the 1.5Wc frequencies of image-reject mixer output.According to inductance
Capacitor resonance formula：Calculate, because Fig. 1 image-reject mixers output signal frequency (0.75Wc) compare Fig. 2
Image-reject mixer output signal frequency (1.5Wc) compared to halving, therefore inductance value needed for Fig. 1 for needed for Fig. 2 inductance value 4
Again, the inductance area therefore in Fig. 1 schemes significantly reduces compared with the inductance area of Fig. 2 schemes.For first frequency dividing circuit,
Second frequency dividing circuit and the Divide-by-3 circuit be except 4 circuits be except 2 circuits similarly, specifically may be referred to figure
2 elaboration content, can equally reduce inductance area, not do excessively repeating herein.
For the deficiency that RC-CR networks are present, preferred version of the invention is further improved, specific as follows：
Fig. 3 a are refer to, are identified with | HHPF| curve be correspondence CR circuits amplitude (A) it is bent with the response of frequency (ω)
Line；It is identified with | HLPF| curve be correspondence RC circuits response curve of the amplitude with frequency.
Fig. 3 b are refer to, ∠ H are identified withHPFCurve be correspondence CR circuits phase (ψ) it is bent with the response of frequency (ω)
Line；It is identified with ∠ HLPFCurve be correspondence RC circuits response curve of the phase with frequency.
By the curve of Fig. 3 b, the signal of CR circuits and RC circuit outputs is differed in phase in any frequency
90 degreeBy the curve of Fig. 3 a, only in frequencies omega=1/ (R1*C1) place CR circuits and the signal of RC circuit outputs
Amplitude it is equal, the amplitude of the signal of CR circuits and RC circuit outputs has mismatch phenomenon at other frequencies.
Regarding to the issue above, the present invention is in order to overcome resistance or capacitance mismatch to the shadow of the amplitude mismatch of output signal
Ring, correction electricity is parallel to by way of switching control the two ends of resistance R in the RC-CR phase-shift networks in local oscillator
The mode of resistance R1 is compensated solves.Concrete scheme refer to Fig. 4, and the quantity of the correction resistance is two groups, every group of school
Positive resistance some bit wides switch control by way of be parallel to RC-CR phase-shift networks in a two ends for resistance.Specifically
, one group of correction resistance R1 switch control by way of be parallel to CR circuits in resistance R two ends, another group of correction resistance R1
Resistance R two ends in being parallel to RC circuits by way of switching control, when there is amplitude mismatch, the suitable correction electricity of selection
Resistance R1 is parallel to a two ends for resistance in CR circuits and RC circuits respectively, and output is believed with reducing resistance or capacitance mismatch
Number amplitude mismatch influence.
Accordingly, the present embodiment additionally provides a kind of local oscillated signal production method.This is described in detail below with reference to Fig. 2
Local oscillated signal production method described in embodiment.
It is voltage-controlled firstly the need of the frequency setting according to the local oscillated signal to be produced in local oscillated signal production method
The frequency of oscillation of oscillator, empirical tests, first frequency dividing circuit, second frequency dividing circuit and the Divide-by-3 circuit are equal
When being except 2 circuit, the frequency of the local oscillated signal to be produced is the frequency of oscillation of 0.75 times of voltage controlled oscillator.On pressure
The setting principle of the frequency of oscillation of controlled oscillator can be verified according to following example.
In order to be better understood from the generation process of local oscillated signal of the present invention, with reference to Fig. 2, to produce frequency to be
As a example by the local oscillated signal of 2.4GHz (i.e. 0.75Wc=2.4GHz), now Wc=3.2GHz, therefore, VCO need to vibrate
On 3.2GHz, by producing 4 tunnel orthogonal signalling after two RC-CR networks, respectively：Cos (2pi*3.2*10^9*t) ,-Cos
(2pi*3.2*10^9*t), Sin (2pi*3.2*10^9*t) ,-Sin (2pi*3.2*10^9*t)；Wherein Cos (2pi*3.2*10^
9*t) 2 circuits are removed with the differential signal of-Cos (2pi*3.2*10^9*t) by one produce Cos (2pi*1.6*10^9*t) ,-
Cos (2pi*1.6*10^9*t), Sin (2pi*1.6*10^9*t) and-Sin (2pi*1.6*10^9*t)；Another road differential signal
Sin (2pi*3.2*10^9*t) ,-Sin (2pi*3.2*10^9*t) equally connect an identical except 2 circuits are to balance the load.
Orthogonal signalling Cos (2pi*3.2*10^9*t) ,-Cos (2pi*3.2*10^9*t), Sin (2pi*3.2*10^9*
T) ,-Sin (2pi*3.2*10^9*t) gives first input of image-reject mixer, Cos (2pi*1.6*10^9*t) ,-
Cos (2pi*1.6*10^9*t), Sin (2pi*1.6*10^9*t) and-Sin (2pi*1.6*10^9*t) give mirror image and suppress mixing
Second input of device, Sin (2pi*4.8*10^9*t) and-Sin (2pi* are obtained by the tuning network of image-reject mixer
Oscillator signal 4.8*10^9*t), then by giving one after buffer except 2 circuits obtain Cos (2pi*2.4*10^9*t) ,-
The orthogonal local oscillations letter of Cos (2pi*2.4*10^9*t), Sin (2pi*2.4*10^9*t) ,-Sin (2pi*2.4*10^9*t)
Number.
To sum up, in local oscillator provided by the present invention and local oscillated signal production method, voltage controlled oscillator
Output end is connected with the input of RC-CR phase-shift networks, and two output ends of RC-CR phase-shift networks are defeated with the first frequency dividing circuit
Enter the first input end connection of end, the input of the second frequency dividing circuit, image-reject mixer, the output end of the first frequency dividing circuit
Or second the output end of frequency dividing circuit be connected with the second input of image-reject mixer, the output end of image-reject mixer
Input with Divide-by-3 circuit is connected.The scheme that Frequency mixing processing is carried out after first producing orthogonal signalling produces local oscillations
Signal, for local oscillated signal is produced using the scheme for first carrying out producing after Frequency mixing processing orthogonal signalling, in the present invention
The output signal frequency of image-reject mixer is different from the frequency of local oscillated signal, improves the defeated of image-reject mixer
Go out signal frequency, so as to reduce the area that inductance takes chip, effectively reduce production cost.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (10)
1. a kind of local oscillator, it is characterised in that including：One voltage controlled oscillator, two RC-CR phase-shift networks, one first point
Frequency circuit, one second frequency dividing circuit, a Divide-by-3 circuit and an image-reject mixer；The output end of the voltage controlled oscillator
Input with the RC-CR phase-shift networks is connected, and the output end of described two RC-CR phase-shift networks and the described first frequency dividing are electric
The input on road, the input of second frequency dividing circuit, the first input end connection of the image-reject mixer, described the
The output end of the output end of one frequency dividing circuit or second frequency dividing circuit and the second input of the image-reject mixer
Connection, the output end of the image-reject mixer is connected with the input of the Divide-by-3 circuit.
2. local oscillator as claimed in claim 1, it is characterised in that also including the first buffer cell, the second buffer cell
And the 3rd buffer cell, the input of first buffer cell is connected with the output end of the voltage controlled oscillator, and described first
The output end of buffer cell is connected with the input of described two RC-CR phase-shift networks；The input of second buffer cell
Output end with described two RC-CR phase-shift networks is connected, and the output end of second buffer cell and the described first frequency dividing are electric
The input connection of the input on road, second frequency dividing circuit；The input of the 3rd buffer cell presses down with the mirror image
The output end connection of frequency mixer processed, the output end of the 3rd buffer cell is connected with the input of the Divide-by-3 circuit.
3. local oscillator as claimed in claim 1, it is characterised in that also including correction resistance, the correction resistance passes through
The mode for switching control is parallel to the two ends of resistance in RC-CR phase-shift networks.
4. local oscillator as claimed in claim 3, it is characterised in that the quantity of the correction resistance is two groups, every group of school
Positive resistance some bit wides switch control by way of be parallel to RC-CR phase-shift networks in a two ends for resistance.
5. local oscillator as claimed in claim 1, it is characterised in that first frequency dividing circuit, the second frequency dividing electricity
Road and the Divide-by-3 circuit are except 2 circuits.
6. local oscillator as claimed in claim 5, it is characterised in that the voltage controlled oscillator generates the letter of first frequency
Number.
7. local oscillator as claimed in claim 6, it is characterised in that the signal of the input image-reject mixer includes
The orthogonal signalling of the orthogonal signalling of four road first frequencies and four road second frequencies, the output signal of the Divide-by-3 circuit is this
Ground oscillator signal, the first frequency is two times of the second frequency.
8. local oscillator as claimed in claim 7, it is characterised in that the letter of the signal of the image-reject mixer output
Number frequency is 1.5 times of first frequency, and the signal frequency of the local oscillated signal is 0.75 times of first frequency.
9. a kind of production method of local oscillated signal, it is characterised in that using as any one of claim 1~8
Local oscillator is produced.
10. local oscillated signal production method as claimed in claim 9, including：
The frequency of oscillation of the frequency setting voltage controlled oscillator according to the local oscillated signal to be produced, first frequency dividing circuit,
Second frequency dividing circuit and the Divide-by-3 circuit are during except 2 circuit, the frequency of the local oscillated signal to be produced
It is 0.75 times of the frequency of oscillation of voltage controlled oscillator.
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| US20110102074A1 (en) * | 2009-11-03 | 2011-05-05 | Viasat, Inc. | Programmable rf array |
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| US20020180538A1 (en) * | 2001-05-30 | 2002-12-05 | Resonext Communications, Inc. | Local oscillator architecture to reduce transmitter pulling effect and minimize unwanted sideband |
| JP2004356927A (en) * | 2003-05-29 | 2004-12-16 | Casio Comput Co Ltd | Radio communication apparatus |
| CN101039100A (en) * | 2005-11-29 | 2007-09-19 | 英飞凌科技股份公司 | Circuit arrangement and method for generating local oscillator signals, and phase locked loop having the circuit arrangement |
| CN101257321A (en) * | 2006-12-06 | 2008-09-03 | 美国博通公司 | Method and system for processing signal |
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Application publication date: 20170707 |