CN103166634B - The method of adjustment and device of inductance capacitance parallel resonance chamber resonant frequency - Google Patents
The method of adjustment and device of inductance capacitance parallel resonance chamber resonant frequency Download PDFInfo
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- CN103166634B CN103166634B CN201110409468.2A CN201110409468A CN103166634B CN 103166634 B CN103166634 B CN 103166634B CN 201110409468 A CN201110409468 A CN 201110409468A CN 103166634 B CN103166634 B CN 103166634B
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Abstract
The present invention discloses the method for adjustment and device of a kind of inductance capacitance parallel resonance chamber resonant frequency, and this method includes calibrating the resonant frequency of the first inductance capacitance parallel resonance chamber of LC voltage controlled oscillator；Obtain frequency control parameters of the first inductance capacitance parallel resonance chamber under current resonant frequency；The resonant frequency of the second inductance capacitance parallel resonance chamber of circuit module is adjusted to the gap with its frequency input signal within preset value according to the frequency control parameters, the second inductance capacitance parallel resonance chamber has identical control rule with the first inductance capacitance parallel resonance chamber.There is provided a kind of method of adjustment of more perfect inductance capacitance parallel resonance chamber resonant frequency and device by above technical scheme by the present invention.
Description
Technical field
The present invention relates to inductance capacitance parallel resonance chamber field, more particularly to a kind of inductance capacitance parallel resonance chamber resonance frequency
The method of adjustment and device of rate.
Background technology
Inductance and electric capacity are common passive devices, and its unique electrical characteristics, which is allowed to obtain in various circuits, extensively should
With.The branch road that inductance is formed in parallel with electric capacity, commonly referred to as inductance capacitance parallel resonance chamber (LC-tank), LC-tank is extensive
It is the core of many radio circuits, such as LC voltage controlled oscillator applied in the design of radio frequency transceiver chip
(LC-VCO), low-noise amplifier (LNA), power amplifier (PA), radio frequency buffering device (RF-Buffer) etc..
LC-tank is in normal work, if the frequency of input signal is f0, and LC-tank resonant frequency deviate from
f0, then LC-tank then deviate from optimum state, by taking the radio-frequency front-end of radio frequency transceiver as an example, is only launching and is receiving mould
Under formula, all modules for having used LC-tank, the frequency input signal pair of its LC-tank resonant frequency always with the module
Each module in standard, transceiver, which is only, is operated in optimum state, and transceiver can be only achieved optimal power consumption, gain, sensitivity
Etc. performance indications.Therefore, how make it that LC-tank resonant frequency and the frequency alignment or approximate alignment of input signal are current
The technical issues that need to address.
In the prior art in order to avoid go solve LC-tank resonant frequency and input signal frequency alignment the problem of,
Propose some alternatives：Mode one, by selecting low reactance-resistance ratio inductance, increases LC-tank bandwidth；Mode two, by using
Multiple same circuits go to collectively cover whole incoming frequency scope.Although above two mode is enabled in whole incoming frequency
In the range of, the change in gain of circuit is no more than 3dB, still, the selection low reactance-resistance ratio inductance of mode one, it will cause LC-tank resonance
Impedance is reduced, and increases the power consumption of circuit；Mode two causes the scale and chip area of circuit to greatly increase, and synchronization is only
There is a circuit job, other idle cause to waste.
The content of the invention
The present invention provides the method for adjustment and device of a kind of more perfect inductance capacitance parallel resonance chamber resonant frequency.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of method of adjustment of inductance capacitance parallel resonance chamber resonant frequency, it is characterised in that including,
Resonant frequency to the first inductance capacitance parallel resonance chamber of LC voltage controlled oscillator is calibrated；
Obtain frequency control parameters of the first inductance capacitance parallel resonance chamber under current resonant frequency；
The resonant frequency of the second inductance capacitance parallel resonance chamber of circuit module is adjusted according to the frequency control parameters
To the gap with its frequency input signal within preset value, the second inductance capacitance parallel resonance chamber and first inductance
Electric capacity parallel resonance chamber has identical control rule.
According to the frequency control parameters by the resonant frequency of the second inductance capacitance parallel resonance chamber adjust to its
The gap of frequency input signal within preset value be specially：According to the frequency control parameters and design variables by described second
The resonant frequency of inductance capacitance parallel resonance chamber is adjusted to the gap with its frequency input signal within preset value.
The frequency control parameters are the switching capacity of the switched capacitor array of the first inductance capacitance parallel resonance chamber
The value of control word.
The switched capacitor array of the second inductance capacitance parallel resonance chamber and the first inductance capacitance parallel resonance chamber
Switched capacitor array there is the digit of identical frequency tuning range, coded system and control bit；Or second inductance
The switched capacitor array of electric capacity parallel resonance chamber is according to switch of the preset ratio to the first inductance capacitance parallel resonance chamber
Capacitor array, which is zoomed in and out, to be obtained.
The switched capacitor array of the second inductance capacitance parallel resonance chamber and the first inductance capacitance parallel resonance chamber
Switched capacitor array fixed capacity it is identical with the ratio of variable capacitance, and coded system is identical with the digit of control bit.
The circuit module is Colpitts oscillator, low-noise amplifier, frequency mixer, driving amplifier, buffer, work(
One or more in rate amplifier.
A kind of adjusting apparatus of inductance capacitance parallel resonance chamber resonant frequency, it is characterised in that including with the first inductance
The LC voltage controlled oscillator of electric capacity parallel resonance chamber, the circuit module with the second inductance capacitance parallel resonance chamber, and
Frequency calibration module, the first inductance capacitance parallel resonance chamber has identical control with the second inductance capacitance parallel resonance chamber
System rule, wherein,
The frequency calibration module is used to calibrate the resonant frequency of the first inductance capacitance parallel resonance chamber, and
Export frequency control parameters of the first inductance capacitance parallel resonance chamber under current resonant frequency；
The circuit module is used for the humorous of the second inductance capacitance parallel resonance chamber according to the frequency control parameters
Vibration frequency is adjusted to the gap with frequency input signal within preset value.
The circuit module specifically for according to the frequency control parameters and design variables by second inductance capacitance
The resonant frequency of parallel resonance chamber calibrates to the gap with frequency input signal within preset value.
The switched capacitor array of the second inductance capacitance parallel resonance chamber and the first inductance capacitance parallel resonance
The switched capacitor array of chamber has the digit of identical frequency tuning range, coded system and control bit；Or described second
The switched capacitor array of inductance capacitance parallel resonance chamber is to the first inductance capacitance parallel resonance chamber according to preset ratio
Switched capacitor array zoom in and out and obtain；The frequency calibration module is humorous specifically for exporting the first inductance capacitance parallel connection
Shake chamber switched capacitor array switching capacity control word value as the frequency control parameters.
The circuit module is Colpitts oscillator, low-noise amplifier, frequency mixer, driving amplifier, buffer, work(
One or more in rate amplifier.
The calibrating installation is radio frequency transceiver, and the radio frequency transceiver includes phaselocked loop and the circuit module；It is described
Phaselocked loop includes the frequency calibration module and the LC voltage controlled oscillator；The circuit module includes output and buffered
Device, low-noise amplifier, the one or more for receiving frequency mixer, power amplifier or transmitting mixer.
The LC voltage controlled oscillator is connected with the output buffer, and the output buffer passes through the first frequency dividing
Device is connected with the reception frequency mixer, and the output buffer is connected by the second frequency divider with the transmitting mixer, described
Receive frequency mixer with the low-noise amplifier to be connected, the transmitting mixer is connected with the power amplifier.
The present invention provides the method for adjustment and device of a kind of inductance capacitance parallel resonance chamber resonant frequency, for LC-VCO
Speech, the problem of in the absence of frequency alignment, because LC-VCO frequency of oscillation is exactly its LC-tank resonant frequency, but for
The circuit modules such as LNA, PA, RF-Buffer, its LC-tank resonant frequency is transferred to always be aligned with frequency input signal or
Approximate alignment is more difficult to be directly realized by, and LC-VCO LC-tank and the LC-tank of other circuit modules are designed to tool by the present invention
There is identical control rule, the resonant frequency to the LC-tank of the LC-VCO is calibrated, and obtains the LC- of the LC-VCO after calibration
Frequency control parameters of the tank under current resonant frequency, according to LC-tank of the frequency control parameters to other circuit modules
Resonant frequency be adjusted, the LC-tank of circuit module such as LNA, PA, RF-Buffer resonant frequency and input can be achieved
The alignment of signal frequency or approximate alignment so that the LC-tank of other circuit modules is operated in more preferable state, while can avoid
The defect brought in the prior art using above-mentioned alternative.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the method for adjustment of inductance capacitance parallel resonance chamber resonant frequency of the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of inductance capacitance parallel resonance chamber in the prior art；
Fig. 3 is a kind of schematic diagram of the adjusting apparatus of inductance capacitance parallel resonance chamber resonant frequency of the embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of the radio-frequency front-end of radio frequency transceiver of the embodiment of the present invention.
Embodiment
The present invention is described in further detail below by embodiment combination accompanying drawing.
Fig. 1 is a kind of flow chart of the method for adjustment of inductance capacitance parallel resonance chamber resonant frequency of the embodiment of the present invention, please
Fig. 1 is investigated, the inductance capacitance parallel resonance chamber of LC voltage controlled oscillator is the first inductance capacitance parallel resonance chamber, other electricity
The inductance capacitance parallel resonance chamber of road module is the second inductance capacitance parallel resonance chamber, the second inductance capacitance parallel resonance chamber and the
One inductance capacitance parallel resonance chamber has identical control rule, and this method includes：
S11, the resonant frequency to the first inductance capacitance parallel resonance chamber are calibrated；
The frequency control parameters of S12, the first inductance capacitance parallel resonance chamber of acquisition under current resonant frequency；
S13, according to the frequency control parameters by the resonant frequency with the second inductance capacitance parallel resonance chamber adjust to its
The gap of the frequency input signal of corresponding circuits module is within preset value.
The resonant frequency of the second inductance capacitance parallel resonance chamber of circuit module is adjusted to it by step S13 and inputted
After the gap of signal frequency is within the preset value, the parallel equivalent impedance of the second inductance capacitance parallel resonance chamber of the circuit module
3dB will be no more than from maximum impedance gap；Circuit module can be Colpitts oscillator, low-noise amplifier, frequency mixer, drive
Dynamic amplifier, buffer, power amplifier etc..
Second inductance capacitance parallel resonance chamber is designed to the first inductance capacitance parallel resonance chamber there is identical control to advise
Mode then include it is a variety of, such as：By the switched capacitor array of the second inductance capacitance parallel resonance chamber and electric first inductance capacitance simultaneously
The switched capacitor array of connection resonator is designed to the digit with identical frequency tuning range, coded system and control bit, or
Person is zoomed in and out according to preset ratio by the switched capacitor array to the first inductance capacitance parallel resonance chamber and obtains the second inductance
The switched capacitor array of electric capacity parallel resonance chamber.
Coded system is identical including being encoded using the switched capacitor array of binary coding mode or using thermometer code
Switched capacitor array of mode etc., the switched capacitor array of the second inductance capacitance parallel resonance chamber is in parallel with the first inductance capacitance
The switched capacitor array of resonator is designed to that the mode with identical frequency tuning range includes：Will both switched capacitor arrays
Fixed capacity and variable capacitance ratio be designed to it is identical.
Fig. 2 is a kind of schematic diagram of inductance capacitance parallel resonance chamber in the prior art, refer to Fig. 2：The LC-tank is carried
4 bit switch capacitor arrays, the switched capacitor array employs binary coding mode, that is, switchs S0 and control capacitance to be C, S1 controls
Capacitance processed is 2C, and S2 controls capacitance to be 4C, and S3 controls capacitance to be 8C, and Cf is fixed capacity, and switched capacitor array is formed
Tunable capacitor, the ratio that tunable capacitor accounts for total capacitance reflects the frequency tuning range of the LC-tank, the resonance of the LC-tank
Frequency is：
Wherein S3, S2, S1, S0 value are logical zero or logic 1, and logical zero represents to switch off, and electric capacity takes off with LC-tank
From；Logic 1 represents switch closure, and electric capacity is hung on LC-tank.Due to S3·8+S2·4+S1·2+S0It is exactly binary numberValue, therefore resonant frequency can be abbreviated as：
WhenWhen, the electric capacity of the LC-tank is maximum, and resonant frequency is minimum, is
WhenWhen, LC-tank electric capacity is minimum, and resonant frequency highest is
By formula (3) and (4) as can be seen that fixed capacity CfIt is mainly used to determine the maximum f of resonant frequencymax, and open
Close capacitor array to be mainly used to determine resonant frequency tuning range, i.e., from fminBe tuned to fmax。
Frequency tuning range η is defined as, the difference of peak frequency and minimum frequency, than upper intermediate frequency, i.e.,：
By fminWith fmaxExpression formula substitute into formula (5), obtain：
Assuming that Cf=1pF, Δ C=0.5pF, then η=20%.If LC-tank1 and LC-tank2 have identical frequency
The digit of tuning range, coded system and control bit, such as frequency tuning range are all 20%, and coded system is entered using two
Coded system processed, the digit of control bit is all 4, necessarily has C according to formula (1) to (6)1/Cf1=C2/Cf2, therefore, for LC-
Resonant frequency during any identical control word x of tank1 and LC-tank2, compared to its minimum frequency fmin, for LC-tank1
For be (set and remain as 4 bit switch capacitor arrays)：
It is for LC-tank2：
Due to C1/Cf1=C2/Cf2, it may thus be appreciated that：
This shows the position for having identical frequency tuning range, coded system and control bit in LC-tank1 and LC-tank2
Under conditions of number, under any control word x, LC-tank1 compares the ratio of minimum resonance frequency with LC-tank2 resonant frequency
It is identical, therefore the change of LC-tank1 resonant frequency has one-to-one corresponding with the change of LC-tank2 resonant frequency
Property.In addition, by formula (6) as can be seen that frequency tuning range and inductance are not related, with fixed capacity CfWith variable capacitance Δ
C size is also not related, is dependent only on the ratio of electric capacity adjustable extent and fixed capacity, therefore, fixed capacity CfWith can
The ratio for becoming electric capacity Δ C is identical, then frequency tuning range is identical.
Zoomed in and out by the switched capacitor array to the first inductance capacitance parallel resonance chamber according to preset ratio and obtain
The method of the switched capacitor array of two inductance capacitance parallel resonance chambers is such as：By LC_tank1 fixed capacity and switched capacitor array
It is proportional to scale the electric capacity for obtaining LC_tank2, while suitable inductance is equipped with to LC_tank2, to meet its frequency of oscillation model
The requirement enclosed, the proportionality coefficient of scaling can flexibly be chosen, if LC_tank2 resonant frequency is always humorous with LC_tank1
Vibration frequency is identical, then can choose zoom factor for 1, i.e., direct fixed capacity and switched capacitor array using LC_tank1 as
LC_tank2 fixed capacity and switched capacitor array, at the same LC_tank2 inductance inductance value and LC_tank1 inductance sense
Value is equal, and the Q values of LC_tank2 inductance can arbitrarily be chosen according to demand；If LC_tank3 resonant frequency is LC_
The 1/M of tank1 resonant frequency, then can choose zoom factor for M, i.e., by LC_tank1 fixed capacity and switching capacity battle array
As LC_tank3 fixed capacity and switched capacitor array after M times of row amplification, while the inductance value of LC_tank3 inductance is set
M times of the inductance value of LC_tank1 inductance is calculated as, the Q values of LC_tank3 inductance can arbitrarily be chosen according to demand.
Fig. 3 is a kind of schematic diagram of the adjusting apparatus of inductance capacitance parallel resonance chamber resonant frequency of the embodiment of the present invention, please
With reference to Fig. 3：
A kind of adjusting apparatus of inductance capacitance parallel resonance chamber resonant frequency, including with the first inductance capacitance parallel resonance
LC voltage controlled oscillator 31, the K (K >=1) of chamber be individual have the circuit module 32a of the second inductance capacitance parallel resonance chamber,
32b......32k, and frequency calibration module 33, each second inductance capacitance parallel resonance chamber are in parallel with the first inductance capacitance humorous
The chamber that shakes has identical control rule, wherein, frequency calibration module 33 is used for the first inductance to LC voltage controlled oscillator 31
The resonant frequency of electric capacity parallel resonance chamber is calibrated, and exports the first inductance capacitance parallel resonance chamber under current resonant frequency
Frequency control parameters；Circuit module 32a, 32b......32k be used for according to the frequency control parameters by the second inductance capacitance simultaneously
The resonant frequency of connection resonator is adjusted to the gap with its frequency input signal within preset value.
Fig. 4 is a kind of schematic diagram of the radio-frequency front-end of radio frequency transceiver of the embodiment of the present invention, refer to Fig. 4：Including antenna
41st, duplexer 42, low-noise amplifier 43, reception frequency mixer 44, power amplifier 45, transmitting mixer 46, output buffer
47th, phaselocked loop 48, the first frequency divider 491 and the second frequency divider 492, wherein, phaselocked loop (PLL) includes LC-VCO481, frequency school
Quasi-mode block 482, in addition to frequency divider, Frequency/Phase Discriminator, charge pump, wave filter etc.；Duplexer 42 is also known as transmit-receive switch, real
The switching of mode of operation between now receiving and launch；
In reception pattern, antenna 41 is connected by duplexer 42 with low-noise amplifier 43, antenna 41 and power amplifier 45
Disconnect, the signal of antenna 41 gives low-noise amplifier 43, by amplification, give reception frequency mixer 44, receive frequency mixer 44 with
Local oscillation signal (i.e. fLO) mixing (down coversion), output low frequency signal fIF；
In emission mode, antenna 41 is connected by duplexer 42 with power amplifier 45, antenna 41 and low-noise amplifier 43
Disconnect, transmitting data fDataWith transmitting carrier signal (i.e. fCR) mixing (up-conversion), transmitting data are modulated to carrier wave up, and
Launch after the amplification of power amplifier 45, then by antenna 41；
Phaselocked loop 48 is mainly for generation of the local oscillation signal required for reception and the carrier signal required for transmitting, phaselocked loop
48 output (i.e. LC-VCO481 output) is after output buffer 47, then by the first frequency divider 491 and the second frequency divider
492 produce f respectivelyLOAnd fCR, reception frequency mixer 44 and transmitting mixer 46 are just given, output buffer 47 not only increases LC-
VCO481 output driving ability, while reducing interference of the late-class circuit to LC-VCO481, realizes isolation effect well
Really, in the receiving mode, fVCOTo fLOFrequency dividing ratio be N；In the transmission mode, fVCOTo fCRFrequency dividing ratio be M；M and N are
Integer more than or equal to 1, represents not divide if 1.
In circuit shown in Fig. 4, at least 4 modules have used LC-tank, including LC-VCO481, output buffer
47th, low-noise amplifier 43, power amplifier 45.In LC-VCO481, LC-tank is used as the resonator of vibration；Other several
In individual module, LC-tank is mainly used as output loading, and wherein LC_tank1, LC_tank2, LC_tank3, LC_tank4 distinguishes
Belong to LC-VCO481, output buffer 47, power amplifier 45, low-noise amplifier 43, as shown in Figure 4, output buffer 47
Incoming frequency be fVCO, the incoming frequency of power amplifier 45 is fTX, the incoming frequency of low-noise amplifier 43 is fRX, with right
LC_tank2, LC_tank3, LC_tank4 in output buffer 47, power amplifier 45 and low-noise amplifier 43 are adjusted
Exemplified by whole：
Step 1: LC_tank2, LC_tank3, LC_tank4 switched capacitor array is designed to open with LC_tank1
Closing capacitor array has the digit of identical frequency tuning range, coded system and control bit；Or by LC_tank1's
Switched capacitor array zooms in and out the switched capacitor array for obtaining LC_tank2, LC_tank3, LC_tank4 according to preset ratio：
Such as 1) because the resonant frequency for expecting LC_tank2 is always identical with LC_tank1 resonant frequency, therefore selection zoom factor is
1 couple of LC_tank1 switched capacitor array zooms in and out the switched capacitor array for obtaining LC_tank2, i.e., directly by LC_tank1
Fixed capacity and switched capacitor array as LC_tank2 fixed capacity and switched capacitor array, while LC_tank2 electricity
The inductance value of sense is equal with the inductance value of LC_tank1 inductance, and the Q values of LC_tank2 inductance can arbitrarily be chosen according to demand；2)
Due to it is expected that LC_tank3 resonant frequency is approximately equal to the 1/M of LC_tank1 resonant frequency, then zoom factor can be chosen
For M, i.e., LC_tank1 fixed capacity and switched capacitor array are amplified to the fixed capacity and switch after M times as LC_tank3
Capacitor array, while the inductance value of LC_tank3 inductance is designed as to M times of the inductance value of LC_tank1 inductance, LC_tank3's
The Q values of inductance can arbitrarily be chosen according to demand；3) due to it is expected that LC_tank4 resonant frequency is approximately equal to LC_tank1's
The 1/N of resonant frequency, then can choose zoom factor for N, i.e., LC_tank1 fixed capacity and switched capacitor array are amplified into N
As LC_tank4 fixed capacity and switched capacitor array after times, while the inductance value of LC_tank4 inductance is designed as into LC_
N times of the inductance value of tank1 inductance, the Q values of LC_tank4 inductance can arbitrarily be chosen according to demand；
Step 2: frequency calibration module 482 is automatically selected according to the frequency for receiving signal or the frequency of transmitting carrier wave
The value of most suitable LC-VCO481 switched capacitor arrays control word, is calibrated to the LC_tank1 in LC-VCO481, and defeated
Go out frequency control parameters, in the embodiment, frequency control parameters are the value of one group of switching capacity control word, after the completion of calibration, fVCO
≈N·fRXOr fVCO≈M·fTX；Here fRXTo receive the frequency of signal, fTXTo launch the frequency of carrier wave；N is reception pattern
Lower VCO frequency to receive local frequency frequency dividing ratio, M be emission mode under VCO frequency to transmission carrier frequency frequency dividing ratio；
Step 3: the method that the resonant frequency to LC_tank2, LC_tank3, LC_tank4 is adjusted is, by LC_
The value of tank1 one group of switching capacity control word directly assigns LC_tank2, LC_tank3, LC_tank4, allows LC_
The value of the value of tank2, LC_tank3, LC_tank4 switching capacity control word and LC_tank1 switching capacity control word is complete
Equally；
Step 4: LC_tank2, LC_tank3, LC_tank4 according to the value of the switching capacity control word by its resonant frequency
Adjust to the gap with its frequency input signal within preset value.
Because LC_tank2, LC_tank3, LC_tank4 and LC_tank1 have identical control rule in step one, because
This, the change of LC_tank2, LC_tank3, LC_tank4 resonant frequency has one with the change of LC_tank1 resonant frequency
One correspondence, if the resonant frequency that LC_tank1 resonant frequency has changed Δ f, LC_tank2 is also to have changed Δ f,
The resonant frequency that LC_tank3 resonant frequency has changed Δ f/M, LC_tank4 has changed Δ f/N；If LC_tank1's is humorous
Vibration frequency is from f1Be tuned to f2, then LC_tank2 resonant frequency is also from f1Be tuned to f2, LC_tank3 resonant frequency
From f1/ M be tuned to f2/ M, LC_tank4 resonant frequency are from f1/ N be tuned to f2/N。
Because transceiver is in normal work, | fRX-fLO|=fIFWith | fTX-fCR|=fData, and due to fLO=fVCO/N
And fCR=fVCO/ M, can be obtained：|fRX-fVCO/ N |=fIF、|fTX-fVCO/ M |=fData, due to fIFAnd fDataIt is low frequency letter
Number (compare high-frequency signal fRX、fTX、fVCOFor), therefore have fRX≈fVCO/N、fTX≈fVCO/ M, i.e. in the receiving mode, low noise
The incoming frequency of acoustic amplifier 43 is always approximately equal to the 1/N of LC-VCO481 frequencies of oscillation under reception pattern；In emission mode
Under, the incoming frequency of power amplifier 45 is always approximately equal to the 1/M of LC-VCO481 frequencies of oscillation under emission mode；Output is slow
The incoming frequency for rushing device 47 is always equal to LC-VCO481 frequency of oscillation.
Therefore it can obtain：
LC_tank2 incoming frequency=LC_tank1 frequency of oscillation, LC_tank2 resonant frequency=LC_tank1's
Resonant frequency；
LC_tank3 incoming frequency ≈ LC_tank1 frequency of oscillation/M, LC_tank3 resonant frequency=LC_tank1
Resonant frequency/M；
LC_tank4 incoming frequency ≈ LC_tank1 frequency of oscillation/N, LC_tank4 resonant frequency=LC_tank1
Resonant frequency/N；
Due to the resonator that LC_tank1 is LC-VCO481, its frequency of oscillation is exactly just its LC_tank resonance frequency
Rate, therefore can obtain：
LC_tank2 incoming frequency=LC_tank2 resonant frequency；
LC_tank3 incoming frequency ≈ LC_tank3 resonant frequency；
LC_tank4 incoming frequency ≈ LC_tank4 resonant frequency；
In the present embodiment, can also further, set respectively to LC_tank2, LC_tank3, LC_tank4 Xos2,
This 3 independent design variables of Xos3, Xos4, according to LC_tank1 frequency control parameters and the design variables to LC_
Tank2, LC_tank3, LC_tank4 resonant frequency are adjusted, such as by LC_tank1 frequency control parameters and Xos2 phases
Plus after input to LC_tank2；LC_tank3 is inputed to after LC_tank1 frequency control parameters are added with Xos3；By LC_
Tank1 frequency control parameters input to LC_tank4 after being added with Xos4；Xos2, Xos3, Xos4 can also may be used for positive integer
To be negative integer, the fine setting as control word.Such as when the value of switching capacity control word is 0, LC_tank1 resonance frequency
Rate is fmin, LC_tank2 resonant frequency may be fmin+Δfos2, LC_tank3 resonant frequency may be fmin/M+Δ
fos3, LC_tank4 resonant frequency may be fmin/N+Δfos4, therefore in this case, LC_tank2 resonant frequency will compare
The big Δ f of desired valueos2, LC_tank3 resonant frequency will Δ f bigger than desired valueos3, LC_tank4 resonant frequency will be than expecting
It is worth big Δ fos4, by introducing Xos2, Xos3, Xos4, it is possible to eliminate Δ fos2、Δfos3、Δfos4。
Xos2, Xos3, Xos4 could be arranged to register, by the value of these registers of software modification, so as to spirit
Adjustment LC_tank2, LC_tank3, LC_tank4 living resonant frequency；Xos2, Xos3, Xos4 value can be according to test results
It is fixed；Xos2, Xos3, Xos4 introducing, enhance the robustness of calibration method.
The calibration method of the present invention is applied to after radio frequency transceiver, LC- can have been used by all in radio frequency transceiver
Tank module, its LC-tank resonant frequency be calibrated to it is always identical or approximately the same with the frequency input signal of the module,
So that these modules are always operating at optimal or close on optimum state, without in LC-tank bandwidth and circuit other performance
Difficult compromise is done between index (gain, power consumption etc.), meanwhile, method of adjustment of the invention is because directly make use of in chip both
There is the calibration result of calibration algorithm, without extra design overhead.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, the protection of the present invention should be all considered as belonging to
Scope.
Claims (10)
1. a kind of method of adjustment of inductance capacitance parallel resonance chamber resonant frequency, it is characterised in that including voltage-controlled to inductance capacitance
The resonant frequency of first inductance capacitance parallel resonance chamber of oscillator is calibrated；
Obtain frequency control parameters of the first inductance capacitance parallel resonance chamber under current resonant frequency；
According to the frequency control parameters by the resonant frequency of the second inductance capacitance parallel resonance chamber of circuit module adjust to
The gap of its frequency input signal is within preset value, the second inductance capacitance parallel resonance chamber and first inductance capacitance
Parallel resonance chamber has identical control rule；It is described that there is identical control rule to include：The second inductance capacitance parallel resonance
The switched capacitor array of the switched capacitor array of chamber and the first inductance capacitance parallel resonance chamber has identical frequency tuning
The digit of scope, coded system and control bit；Or the switched capacitor array of the second inductance capacitance parallel resonance chamber be by
The switched capacitor array of the first inductance capacitance parallel resonance chamber is zoomed in and out according to preset ratio and obtained.
2. the method as described in claim 1, it is characterised in that according to the frequency control parameters by second inductance capacitance
The resonant frequency of parallel resonance chamber is adjusted to the gap with its frequency input signal：According to the frequency
Rate control parameter and design variables by the resonant frequency of the second inductance capacitance parallel resonance chamber adjust to its input signal
The gap of frequency is within preset value.
3. the method as described in claim 1, it is characterised in that the frequency control parameters are that first inductance capacitance is in parallel
The value of the switching capacity control word of the switched capacitor array of resonator.
4. the method as described in claim 1, it is characterised in that the switching capacity battle array of the second inductance capacitance parallel resonance chamber
The mode that arrange has identical frequency tuning range with the switched capacitor array of the first inductance capacitance parallel resonance chamber includes：
The switch electricity of the switched capacitor array of the second inductance capacitance parallel resonance chamber and the first inductance capacitance parallel resonance chamber
The fixed capacity for holding array is identical with the ratio of variable capacitance.
5. the method as described in any one of Claims 1-4, it is characterised in that the circuit module be Colpitts oscillator,
One or more in low-noise amplifier, frequency mixer, driving amplifier, buffer, power amplifier.
6. a kind of adjusting apparatus of inductance capacitance parallel resonance chamber resonant frequency, it is characterised in that including with the first inductance electricity
Hold LC voltage controlled oscillator, the circuit module with the second inductance capacitance parallel resonance chamber, Yi Jipin of parallel resonance chamber
Rate calibration module, the first inductance capacitance parallel resonance chamber has identical control with the second inductance capacitance parallel resonance chamber
Rule, wherein,
The frequency calibration module is used to calibrate the resonant frequency of the first inductance capacitance parallel resonance chamber, and exports
Frequency control parameters of the first inductance capacitance parallel resonance chamber under current resonant frequency；
The circuit module is used for the resonance frequency by the second inductance capacitance parallel resonance chamber according to the frequency control parameters
Rate is adjusted to the gap with frequency input signal within preset value；
It is described that there is identical control rule to include：The switched capacitor array of the second inductance capacitance parallel resonance chamber and described the
The switched capacitor array of one inductance capacitance parallel resonance chamber has the position of identical frequency tuning range, coded system and control bit
Number；Or the switched capacitor array of the second inductance capacitance parallel resonance chamber is to first inductance electricity according to preset ratio
The switched capacitor array of appearance parallel resonance chamber, which is zoomed in and out, to be obtained；The frequency calibration module is specifically for exporting first electricity
The value that electrification holds the switching capacity control word of the switched capacitor array of parallel resonance chamber is used as the frequency control parameters.
7. device as claimed in claim 6, it is characterised in that the circuit module according to the FREQUENCY CONTROL specifically for joining
Number and design variables calibrate to the resonant frequency of the second inductance capacitance parallel resonance chamber the gap with frequency input signal
Within preset value.
8. device as claimed in claims 6 or 7, it is characterised in that the circuit module is Colpitts oscillator, low noise
One or more in amplifier, frequency mixer, driving amplifier, buffer, power amplifier.
9. device as claimed in claims 6 or 7, it is characterised in that the adjusting apparatus is radio frequency transceiver, the radio frequency is received
Hair machine includes phaselocked loop and the circuit module；The phaselocked loop includes the frequency calibration module and the inductance capacitance is voltage-controlled
Oscillator；The circuit module includes output buffer, low-noise amplifier, receives frequency mixer, power amplifier or launch mixed
The one or more of frequency device.
10. device as claimed in claim 9, it is characterised in that when the circuit module simultaneously including the output buffer,
When the low-noise amplifier, the reception frequency mixer, the power amplifier and the transmitting mixer, the inductance capacitance
Voltage controlled oscillator is connected with the output buffer, and the output buffer passes through the first frequency divider and the reception frequency mixer phase
Even, the output buffer is connected by the second frequency divider with the transmitting mixer, the reception frequency mixer and the low noise
Acoustic amplifier is connected, and the transmitting mixer is connected with the power amplifier.
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| CN104899534B (en) * | 2015-05-28 | 2017-12-08 | 福建联迪商用设备有限公司 | A kind of Non-contact Media Reader |
| EP3523877B1 (en) * | 2016-10-07 | 2020-10-07 | Telefonaktiebolaget LM Ericsson (publ) | Switched capacitor arrangement for tuning a differential circuit |
| CN107659309A (en) * | 2017-11-03 | 2018-02-02 | 苏州华芯微电子股份有限公司 | Oscillator trims device and method |
| CN108259036B (en) * | 2018-01-09 | 2021-09-28 | 上海顺久电子科技有限公司 | VCO, frequency calibration method thereof, electronic device, and computer storage medium |
| CN109273811B (en) * | 2018-09-05 | 2023-06-23 | 东莞市新易讯时代通信有限公司 | Tuning control method of cavity combiner and cavity combiner |
| CN114124039A (en) * | 2022-01-28 | 2022-03-01 | 微龛(广州)半导体有限公司 | Frequency peak tuning circuit and system |
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