CN102751964B - Variable-order fully integrated loop filter - Google Patents
Variable-order fully integrated loop filter Download PDFInfo
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- CN102751964B CN102751964B CN201210267200.4A CN201210267200A CN102751964B CN 102751964 B CN102751964 B CN 102751964B CN 201210267200 A CN201210267200 A CN 201210267200A CN 102751964 B CN102751964 B CN 102751964B
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Abstract
The invention discloses a variable-order fully integrated loop filter which is used in phase-locked loop based low-power consumption and high-performance frequency synthesizers and system-on-chips (SoCs) of wireless transmitter receivers. The variable-order fully integrated loop filter comprises a loop filter and a loop parameter correction module, wherein the loop parameter correction module comprises a reference circuit (RC) and a parameter adjustment logical circuit; and the loop filter comprises a basic second-order loop filter, a loop selection switch and a high order RC accessorial circuit. According to the variable-order fully integrated loop filter, the RC and the parameter adjustment logical circuit are used for adjusting resistor capacitance so that the loop parameter changes caused by changes of manufacturing technological parameters, supply voltages and temperatures are eliminated, and the stability of a phase-locked loop circuit is enhanced.
Description
Technical field
The invention belongs to wireless communication technology field, relate to the fully integrated loop filter of a kind of variable-order, for Low Power High Performance based in the frequency synthesizer of phase-locked loop and transceiver SoC.It adopts RC reference circuit structure (26) to carry out the resistance capacitance parameter of adjustment loop filter, so that eliminate because the change of fabrication process parameters, supply power voltage and temperature causes the change of loop parameter, thus enhance cycle of phase-locked loop stability, for realizing the transceiver or the emitter chip that are not subject to the factor impacts such as ambient temperature, process deviation, mains voltage variations (PVT).
Background technology
Wireless communication technology develops rapidly to obtain apply very widely along with personal consumption class mobile terminal market.In order to reliable and effective transmission information, need to modulate initial data, in wireless communication technology, for the transmission of digital signal, in transceiver or emitter structures, digital baseband processes transmitting data, the modulation signal exported by baseband digital modulator carries out the modulation of amplitude, frequency or phase shift keying to the radio-frequency carrier signal that VCO or frequency divider produce, signal after modulation is launched through antenna outside power amplifier output chip, completes the wireless transmission of digital signal.
Phase-locked loop is then to provide the module of carrier signal, at transmitting terminal, the local oscillation signal provided by phase-locked loop and baseband modulation signal carry out mixing, or are modulated local oscillation signal by baseband modulation signal, amplify, by antenna transmission via power amplifier or radio frequency amplifier again.At receiving terminal, wireless signal needs down-conversion, and carrier wave generally must be provided by phase-locked loop.Phase-locked loop can provide reference frequency accurately, and loop filter is wherein low pass filter, is mainly used to the high fdrequency component of filtering phase frequency detector (PFD), thus obtains the frequency that stable average voltage level controls oscillator.Current technology and technology allow whole phase-locked loop on the same chip integrated, the output of oscillator is made an uproar mutually and is had very large relation with the bandwidth of filter, in order to obtain lower phase noise, the bandwidth needs of usual loop filter obtain less, in loop filter, resistance capacitance value is just larger, increase area and the cost of chip, another one aspect, in integrated circuit design, a very important problem is process deviation, voltage fluctuation, the factors such as ambient temperature (PVT) can affect greatly circuit performance and consistency, therefore from the angle of design, need phase-locked loop circuit to have stronger robustness and suppress the correcting circuit of the factor impacts such as PVT, because larger resistance capacitance is subject to temperature drift, the impact of the factors such as process deviation is larger, the loop function gain of signal path and amplitude etc. show inconsistency, need to address this problem from design, and existing disclosed document has done some trials to temperature-compensating mode, but effect is subject to more restriction.
Summary of the invention
The present invention seeks to, in order to overcome prior art performance and structural limitation, to propose the fully integrated loop filter of a kind of variable-order.It adopts RC reference circuit structure to carry out the resistance capacitance parameter of adjustment loop filter, so that eliminate because the change of fabrication process parameters, supply power voltage and temperature causes the change of loop parameter, thus enhance cycle of phase-locked loop stability, for realizing the transceiver or the emitter chip that are not subject to the factor impacts such as ambient temperature, process deviation, mains voltage variations (PVT).
The present invention is realized by following technical scheme: the fully integrated loop filter of described variable-order comprises loop filter and loop parameter correction module; Described loop parameter correction module comprises RC reference circuit and parameter adjustment logical circuit; Loop filter comprises: the first resistance one termination filtering input, another termination filtering exports, first resistor in parallel loop selector switch, first resistance one end connects one end of the first electric capacity, the other end ground connection of the first electric capacity, the first resistance other end connects second resistance one end and the 3rd electric capacity one end respectively, and the second resistance other end connects second electric capacity one end, the second electric capacity other end and the 3rd electric capacity other end ground connection; Described first resistance, the second resistance, the first electric capacity, the second electric capacity, the control signal that the size of the 3rd electric capacity exports by parameter adjustment logical circuit controls; Parameter adjustment logical circuit carrys out the resistance capacitance value in adjustment loop filter according to the resistance R value of RC reference circuit and electric capacity C value, make the resistance R value of RC reference circuit become fixed proportion with described first resistance, the second resistance value, the electric capacity C value of RC reference circuit becomes fixed proportion with described first electric capacity, the second electric capacity, the 3rd capacitance.
In described RC reference circuit, resistance R value and electric capacity C value are calibrated by fixed reference clock signal, the value of R and C in adjustment RC reference circuit, make fixed reference clock signal frequency be the integral multiple of the inverse of R and C product; Parameter adjustment logical circuit assignment is used for the control word of resistance in output ring path filter, capacitance, and different control words represents different resistance capacitance values; Come according to the proportionate relationship of resistance capacitance value in resistance R value in RC reference circuit and electric capacity C value and loop filter the first resistance in adjustment loop filter, the second resistance and, the first electric capacity, the second electric capacity, the 3rd capacitance.
By increasing the figure place of the control word that described parameter adjustment logical circuit exports, the adjustable range and the adjustment that improve the loop parameter of loop filter are interval.
In described loop filter, the second resistance, the second electric capacity, the 3rd electric capacity form basic 2 rank loop filters, and the first resistance and the first electric capacity form High Order RC adjunct circuit; When loop selector switch cuts out, the second resistance R2 and the first electric capacity, the second electric capacity, the 3rd electric capacity constitute a traditional second-order loop filter jointly; When loop selector switch is opened, the first resistance R1, the second resistance R2, the first electric capacity, the second electric capacity, the 3rd electric capacity then constitute 3 rank loop filters.
Described RC reference circuit is some parts in the integrated circuit unit containing whole phase-locked loop: be such as the part receiving the filter sent in link, or independent RC pierce circuit, or be specifically designed to a RC circuit of adjustment loop parameter.
Beneficial effect of the present invention is:
1, the loop filter proposed, compared to traditional structure, can realize 2 rank, 3 stage structures are multiplexing, can realize by means of only a selector switch, and when as 2 stage structure, C1 and C3 capacitance is added as filter capacitor, efficiently reduces the area of filter.
2, adopt the structure being similar to RC oscillator to be used as the foundation of loop filter parameters adjustment, carry out the resistance capacitance parameter of adjustment loop filter.Parameter adjustment logical circuit is according to the result of fixed reference clock signal calibration RC reference circuit, and through a series of computing, drawn and be used for the control word of the value of resistance capacitance in output ring path filter, different control words represents different resistance capacitance values.This calibration structure is simple and practical compared to traditional structure, and be and phase-locked loop compatible, accessible site, with in a chip, improves integrated level and reduces system cost.
3, the calibration circuit (RC reference circuit and parameter adjustment logical circuit) proposed can be eliminated because the change of fabrication process parameters, supply power voltage and temperature causes the change of loop parameter, thus strengthen cycle of phase-locked loop stability, thus allow the characteristic of loop filter not by the impact of the factors such as process deviation, temperature drift or power-supply fluctuation.
4, the loop filter with self-calibration function that the present invention proposes is applicable to Radio-Frequency Wireless Communication transceiver or reflector, is applicable to CMOS technology.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram that loop filter proposed by the invention is applied in phase-locked loop.
Fig. 2 is circuit structure block diagram of the present invention.
The structural representation of the RC reference circuit that Fig. 3 (a) is the embodiment of the present invention one.
The structural representation of the RC reference circuit that Fig. 3 (b) is the embodiment of the present invention two.
The structural representation of the RC reference circuit that Fig. 3 (c) is the embodiment of the present invention three.
Fig. 4 is the automatic calibration flow chart of the embodiment of the present invention.
Embodiment
The present invention proposes the fully integrated loop filter of a kind of variable-order, for Low Power High Performance based in the frequency synthesizer of phase-locked loop and transceiver SoC, its position in whole phase-locked loop and effect are as shown in Figure 1.
Fig. 1 is the frequency synthesizer block diagram of the whole phase-locked loop containing loop filter proposed by the invention, also be a preferred embodiment, which includes phase frequency detector 11, charge pump 12, loop filter 13, voltage controlled oscillator (VCO) 14, variable ratio frequency changer frequency divider 15, loop parameter correction module 16.According to the order in loop, reference clock signal and VCO 14 divided output signal exported through variable ratio frequency changer frequency divider 15 compares both phase difference (difference on the frequency) through phase frequency detector 11, what determine charge pump 12 is charging or electric discharge to loop filter 13, certainly this is also determined (usually to select positive voltage frequency curve characteristic by the voltage frequency characteristics Curves of VCO 14, negative voltage frequency characteristics is then contrary): if the frequency of reference clock is higher than the frequency of divided output signal, or reference clock signal phase place is ahead of the phase place of divided output signal, so phase frequency detector 11 and charge pump 12 acting in conjunction make charge pump 12 pairs of loop filters 13 charge, to improve VCO 14 frequency of oscillation, if the frequency of reference clock is lower than the frequency of divided output signal, or reference clock signal phase place lags behind the phase place of divided output signal, so phase frequency detector 11 and charge pump 12 acting in conjunction make charge pump 12 pairs of loop filters 13 discharge, to reduce VCO 14 frequency of oscillation, reduce difference on the frequency or the phase difference of reference fractional frequency signal and divided output signal, until both frequencies identical with phase place (phase difference also may be fixed value, is not 0) so always.
As shown in Figure 2, present invention comprises described loop filter 13 and loop parameter correction module 16.Loop filter 13 comprises basic 2 rank loop filters (the second resistance R2, the second electric capacity C2, the 3rd electric capacity C3), loop selector switch S1, High Order RC adjunct circuit (the first resistance R1, the first electric capacity C1).Wherein, first resistance R1 mono-termination filtering input Vi, another termination filtering exports Vo, loop selector switch S1 in parallel on first resistance R1, first resistance R1 one end connects one end of the first electric capacity C1, the other end ground connection of the first electric capacity C1, and the first resistance R1 other end connects second resistance R2 one end and the 3rd electric capacity C3 one end respectively, the second resistance R2 other end connects second electric capacity C2 one end, the second electric capacity C2 other end and the 3rd electric capacity C3 other end ground connection.The control signal that the size of described first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 exports by parameter adjustment logical circuit 162 controls.
When loop selector switch S1 closes, the second resistance R2, the first-three electric capacity C1-C3 constitute a traditional second-order loop filter jointly, and the first electric capacity C1 and the 3rd electric capacity C3 is equivalent to a filter capacitor in traditional structure altogether.When loop selector switch S1 opens, first resistance R1, the second resistance R2, the first-three electric capacity C1-C3 then constitute 3 rank loop filters, because each element (R1, R2, C1-C3) is all the control exported by parameter adjustment logical circuit 162, so the loop parameter adjustable range of loop filter 13 and adjustment interval can be very accurate, as long as the figure place of control word that parameter adjustment logical circuit 162 exports is abundant.Namely by increasing the figure place of the control word that parameter adjustment logical circuit 162 exports, can the loop parameter adjustable range of corresponding raising loop filter and adjustment interval, make the error of the loop parameter of loop filter and set point less.
Described loop parameter correction module 16 comprises RC reference circuit 161 and parameter adjustment logical circuit 162.With a fixing reference clock signal as calibration foundation, parameter adjustment logical circuit 162 is according to the inverse of the product of R and C in RC reference circuit 161, this inverse can regard a frequency meter as, if counted by fixed reference clock signal, by arranging the value of R and C, can make fixed reference clock signal be the integral multiple K of the inverse of R and C product doubly, K can be arranged arbitrarily, mainly determine according to the value of the R1-R2 needed in fixed reference clock signal frequency and loop filter, C1-C3.The value of R and C in adjustment RC reference circuit, makes fixed reference clock signal frequency be integral multiple K times of the inverse of R and C product, so can determine that the value of R, C can not change with the change of technique, temperature, supply voltage.And then carry out the value of R1-R2, C1-C3 in adjustment loop filter 13 according to the proportionate relationship of resistance R1-R2, electric capacity C1-C3 in resistance R, electric capacity C and loop filter 13 in RC reference circuit 16, make the R1-R2 in loop filter, C1-C3 still meets certain proportionate relationship with resistance R, electric capacity C in RC reference circuit 16.Parameter adjustment logical circuit 162 assignment is used for the control word of resistance in output ring path filter 13, capacitance, and different control words represents different resistance capacitance values.Described RC reference circuit 161 may be a module in whole transceiver, and also may be an independent module, accessible site be in the IC of whole transceiver.
The present invention adopts RC reference circuit 161 structure and parameter adjustment logical circuit 162 to carry out the resistance capacitance value of adjustment loop filter 13, so that eliminate because the change of fabrication process parameters, supply power voltage and temperature causes the change of loop parameter, thus enhance cycle of phase-locked loop stability.
The present invention, as three stage structures, if from being input to output, is inverted with traditional third order PLL path filter structure completely.But the loop function that these two kinds of inverted structures of input and output draw but is identical, because components and parts wherein are also inverted.
Described RC reference circuit can be some parts in the integrated circuit unit containing whole phase-locked loop, such as receive a part for the filter sent in link, also can be independent one and be similar to RC pierce circuit, or be specifically designed to a RC circuit of adjustment loop parameter.
Embodiment below in conjunction with concrete RC reference circuit 161 is described further embodiment of the present invention.
Embodiment one
According to the order in loop, reference clock signal and VCO 14 divided output signal exported through variable ratio frequency changer frequency divider 15 compares both phase difference (difference on the frequency) through phase frequency detector 11, what determine charge pump 12 is charging or electric discharge to loop filter 13, certainly this is also determined (usually to select positive voltage frequency curve characteristic by the voltage frequency characteristics Curves of VCO 14, negative voltage frequency characteristics is then contrary): if the frequency of reference clock is higher than the frequency of divided output signal, or reference clock signal phase place is ahead of the phase place of divided output signal, so phase frequency detector 11 and charge pump 12 acting in conjunction make charge pump 12 pairs of loop filters 13 charge, to improve VCO 14 frequency of oscillation, if the frequency of reference clock is lower than the frequency of divided output signal, or reference clock signal phase place lags behind the phase place of divided output signal, so phase frequency detector 11 and charge pump 12 acting in conjunction make charge pump 12 pairs of loop filters 13 discharge, to reduce VCO 14 frequency of oscillation, reduce difference on the frequency or the phase difference of reference fractional frequency signal and divided output signal, until both frequencies identical with phase place (phase difference also may be fixed value, is not 0) so always.
Because the change of technique, supply power voltage and temperature, the loop parameter of whole phase-locked loop has a very large change, and the stability of loop is difficult to be guaranteed.Therefore, before this locking process, loop parameter must be had to correct.RC reference circuit in the module that loop parameter correction module is important, as shown in Fig. 3 (a), described RC reference circuit 161 comprises a RC nucleus module 301, provides the module 302 of current source or voltage bias to RC nucleus module, and may be a LDO to the 303(of these two module for power supply, or DC-DC module).Module RC nucleus module 301 most crucial in this RC reference circuit 161, it is a filter (low pass, or high pass, or band is logical) in a part, and this filter may be a module in whole transceiver, also may be an independent module, accessible site be in the IC of whole transceiver.
Loop parameter correcting process as shown in Figure 4.First system provides an enabling signal, loop parameter corrects and starts, RC reference circuit 161 and parameter adjustment logical circuit 162 work, system will extract the value of R and C from RC nucleus module 301, again by the respectively value of changes in resistance R and the value of electric capacity C, fixed reference clock signal frequency is made to be integral multiple K times of the inverse of R and C product.If do not meet K times of ratio relation, so the control word of the resistance R electric capacity C changed in RC nucleus module 301 is changed the value of R and C by parameter adjustment logical circuit 162, till meeting predetermined condition.
Below by by the control word of parameter adjustment logical circuit 162 according to R, C value in RC nucleus module 301, and R1-R2 in R, C and loop filter 13 in RC nucleus module, the proportionate relationship of C1-C3, R1, R2 in loop filter 13 is set, the control word of C1-C3 numerical value, make the R in the resistance capacitance and 301 in loop filter 13, C keeps certain ratio, namely consistent change.
Embodiment two
As shown in Figure 3 (b), described RC reference circuit 161 comprises a RC nucleus module 301, provides the module 302 of current source or voltage bias to RC nucleus module, and may be a LDO to the 303(of these two module for power supply, or DC-DC module).Module RC nucleus module 301 most crucial in this RC reference circuit 161, this RC nucleus module 301 is parts in a RC oscillator, the typical embodiment of this RC oscillator as shown in Figure 3 (b), the Vgs difference of two transistors is made to produce a reference current on resistance R by the nmos pass transistor arranging different breadth length ratio, this electric current charges to C through mirror image circuit mirror image, the frequency of output signal is just closely related with the value of R and C, and this oscillator may be a module in whole transceiver, also may be an independent module, accessible site is in the IC of whole transceiver.
Loop parameter correcting process as shown in Figure 4.First system provides an enabling signal, and loop parameter corrects and starts, and RC reference circuit 161 and parameter adjustment logical circuit 162 work, and system will extract the value of R and C from RC nucleus module 301, be exactly its frequency of oscillator are in fact 1/RC.By the clock cycle inside counting of fixed reference clock signal at oscillator, if count value equals K, so illustrate that fixed reference clock signal frequency is integral multiple K times of the inverse of R and C product, also just meet predetermined condition.If do not meet K times of ratio relation, so the control word of the resistance R electric capacity C changed in RC nucleus module 301 is changed the value of R and C by parameter adjustment logical circuit 162, till meeting predetermined condition.
Below by by the control word of parameter adjustment logical circuit 162 according to R, C value in RC nucleus module 301, and R1-R2 in R, C and loop filter 13 in RC nucleus module, the proportionate relationship of C1-C3, R1, R2 in loop filter 13 is set, the control word of C1-C3 numerical value, make the R in the resistance capacitance and 301 in loop filter 13, C keeps certain ratio, namely consistent change.
Embodiment three
As shown in Figure 3 (c), described RC reference circuit 161 comprises a RC nucleus module 301, a module 302 of providing current source or voltage bias to RC nucleus module, and one may be a LDO to the 303(of these two module for power supply, or DC-DC module).RC nucleus module 301 is parts in a RC oscillator, the typical embodiment of this RC oscillator as shown in Figure 3 (c), the difference of the Vbe of two triodes is made to produce a reference current on resistance R by the NPN triode arranging different area, this electric current charges to C through mirror image circuit mirror image, the frequency of output signal is just closely related with the value of R and C, and this oscillator may be a module in whole transceiver, also may be an independent module, accessible site be in the IC of whole transceiver.
Loop parameter correcting process is with embodiment two.
Claims (4)
1. the fully integrated loop filter of variable-order, is characterized in that: comprise loop filter (13) and loop parameter correction module (16), described loop parameter correction module (16) comprises RC reference circuit (161) and parameter adjustment logical circuit (162), loop filter (13) comprising: the first resistance (R1) one termination filtering input (Vi), another termination filtering exports (Vo), the upper loop selector switch (S1) in parallel of first resistance (R1), first resistance (R1) one end connects one end of the first electric capacity (C1), the other end ground connection of the first electric capacity (C1), first resistance (R1) other end connects the second resistance (R2) one end and the 3rd electric capacity (C3) one end respectively, second resistance (R2) other end connects the second electric capacity (C2) one end, second electric capacity (C2) other end and the 3rd electric capacity (C3) other end ground connection, described first resistance (R1), the second resistance (R2), the first electric capacity (C1), the second electric capacity (C2), the control signal that the size of the 3rd electric capacity (C3) exports by parameter adjustment logical circuit (162) controls, parameter adjustment logical circuit (162) carrys out the resistance capacitance value in adjustment loop filter (13) according to the resistance R value of RC reference circuit (161) and electric capacity C value, make the resistance R value of RC reference circuit (161) become fixed proportion with described first resistance (R1), the second resistance (R2) value, the electric capacity C value of RC reference circuit (161) becomes fixed proportion with described first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) value,
In described RC reference circuit (161), resistance R value and electric capacity C value are calibrated by fixed reference clock signal, the value of resistance R and electric capacity C in adjustment RC reference circuit (161), makes fixed reference clock signal frequency be the integral multiple of the inverse of resistance R and electric capacity C product;
Parameter adjustment logical circuit (162) is according to the inverse of the product of resistance R and electric capacity C in RC reference circuit (161), as a frequency meter, if counted by fixed reference clock signal, by arranging the value of resistance R and electric capacity C, fixed reference clock signal can be made to be the integral multiple of the inverse of resistance R and electric capacity C product, and then according to resistance R in RC reference circuit (16), first resistance (R1) in electric capacity C and loop filter (13), second resistance (R2), first electric capacity (C1), second electric capacity (C2), the proportionate relationship of the 3rd electric capacity (C3) carrys out the first resistance (R1) in adjustment loop filter (13), second resistance (R2), first electric capacity (C1), second electric capacity (C2), the value of the 3rd electric capacity (C3), make the first resistance (R1) in loop filter, second resistance (R2), first electric capacity (C1), second electric capacity (C2), 3rd electric capacity (C3) is the middle resistance R with RC reference circuit (16) still, electric capacity C meets certain proportionate relationship,
Parameter adjustment logical circuit (162) assignment is used for the control word of resistance in output ring path filter (13), capacitance, and different control words represents different resistance capacitance values; The first resistance (R1), the second resistance (R2) in adjustment loop filter (13) is come according to the proportionate relationship of resistance capacitance value in resistance R value in RC reference circuit (161) and electric capacity C value and loop filter (13), and the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) value.
2. the fully integrated loop filter of a kind of variable-order according to claim 1, it is characterized in that, in described loop filter (13), second resistance (R2), the second electric capacity (C2), the 3rd electric capacity (C3) form basic 2 rank loop filters, and the first resistance (R1) and the first electric capacity (C1) form High Order RC adjunct circuit; When loop selector switch (S1) cuts out, the second resistance (R2) and the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) constitute a traditional second-order loop filter jointly; When loop selector switch (S1) is opened, the first resistance (R1), the second resistance (R2), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) then constitute 3 rank loop filters.
3. the fully integrated loop filter of a kind of variable-order according to claim 1, it is characterized in that, by increasing the figure place of the control word that described parameter adjustment logical circuit (162) exports, the adjustable range and the adjustment that improve the loop parameter of loop filter (13) are interval.
4. the fully integrated loop filter of a kind of variable-order according to claim 1, it is characterized in that, described RC reference circuit (161) is some parts in the integrated circuit unit containing whole phase-locked loop: be the part receiving the filter sent in link, or independent RC pierce circuit, or be specifically designed to a RC circuit of adjustment loop parameter.
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Citations (3)
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|---|---|---|---|---|
| JP2003517755A (en) * | 1999-10-01 | 2003-05-27 | エリクソン インコーポレイテッド | PLL loop filter using switched capacitor resistor |
| CN1813407A (en) * | 2003-08-27 | 2006-08-02 | 诺基亚公司 | Calibrating a loop-filter of a phase locked loop |
| CN1879304A (en) * | 2003-10-03 | 2006-12-13 | 模拟设备股份有限公司 | Phase-locked loop bandwidth calibration circuit and implementation method thereof |
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| AU2002242053B2 (en) * | 2001-02-07 | 2005-09-22 | Gerenraich Family Trust | Control system with capacitive detector |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003517755A (en) * | 1999-10-01 | 2003-05-27 | エリクソン インコーポレイテッド | PLL loop filter using switched capacitor resistor |
| CN1813407A (en) * | 2003-08-27 | 2006-08-02 | 诺基亚公司 | Calibrating a loop-filter of a phase locked loop |
| CN1879304A (en) * | 2003-10-03 | 2006-12-13 | 模拟设备股份有限公司 | Phase-locked loop bandwidth calibration circuit and implementation method thereof |
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