CN202121602U - Device for calibrating mismatch of modem - Google Patents
Device for calibrating mismatch of modem Download PDFInfo
- Publication number
- CN202121602U CN202121602U CN2011201610020U CN201120161002U CN202121602U CN 202121602 U CN202121602 U CN 202121602U CN 2011201610020 U CN2011201610020 U CN 2011201610020U CN 201120161002 U CN201120161002 U CN 201120161002U CN 202121602 U CN202121602 U CN 202121602U
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- Prior art keywords
- signal
- demodulator
- modulator
- receiver
- phase
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Abstract
The utility model relates to a device for calibrating mismatch of a modem. A signal output end of an emitter of the modem is connected to a signal input end of a receiver of the modem in a feedback connection manner. I/Q orthogonal signals needed for a phase-shift network to generate modulation and demodulation are respectively arranged on lines from which a clock generator correspondingly supplies local oscillation signals for the receiver and the emitter. Output signals of the emitting end, which are processed by I/Q quadrature modulation, are inputted to the receiver in a feedback manner, two paths of baseband signals are obtained after I/Q quadrature demodulation treatment on the output signals of the emitting end, and then algebraic operation is conducted on the received signals to realize measuring and compensation of phase and range offset of the emitting end and the receiving end. With no circuit of the modem needing to be constructed and no power consumption needing to be increased, the device can eliminate the influence of offset, can increase data transmission rate of the modem and reduce power consumption of the circuit, and can also reduce intensity of interference signals of the modem and improve image frequency rejection ratio.
Description
Technical field
The utility model relates to a kind of integrated circuit, particularly a kind of calibrating installation of modulator-demodulator mismatch.
Background technology
At present, because process tolerant, can there be mismatch phenomenon in the CMOS modulator-demodulator on signal path, thereby influences the performance of modulator-demodulator.
In the quadrature channel of the baseband portion that occurs in modulator-demodulator of particularly ought not matching, such as baseband filter, base band D/A and A/D converter, up-conversion mixer, 1/4th clock signals of the frequency mixer of down-conversion mixer and control.These do not match and can cause distorted signals, make the signal of a certain frequency be copied to other frequencies.
For example, when digital orthogonal baseband signal is 10MHz, carry out frequency up-converted through the biorthogonal frequency mixer with the local oscillator of 1GHz, the output signal should be the simple signal of a 1.01GHz.
Yet,, can produce the false signal of a 990MHz owing to do not match.Its phase place and amplitude are by the modulator-demodulator that is introduced into do not match size and type decided.
For example, do not match when there is amplitude in baseband filter, the expection signal can produce phase distortion; Yet if the orthogonal mixer phase place does not match, the output signal is compared with the expection signal 90 ° phase shift can occur.
If be provided with receiver and reflector on our chip simultaneously, we just need to describe the performance with the lower part:
Receiver quadrature phase amplitude does not match;
Receiver quadrature phase phase place does not match;
Reflector quadrature phase amplitude does not match;
Reflector quadrature phase phase place does not match.
The utility model content
The purpose of the utility model provides a kind of calibrating installation of modulator-demodulator mismatch, and the reception signal of modulator-demodulator is carried out algebraic operation, and the quadrature that therefrom extracts above-mentioned receiver and reflector is four kinds of unmatched concrete parameters of amplitude and phase place mutually; Thereby can when transmitting and receiving, mismatch be compensated according to estimation,, and obtain high message transmission rate with raising quality of signals, reduction power consumption to mismatch parameter.
In order to achieve the above object, the technical scheme of the utility model provides a kind of calibrating installation of modulator-demodulator mismatch, and it is included in attenuation network and two phase-shift networks of setting up in reflector and the receiver of modulator-demodulator;
Wherein, said attenuation network is with the signal output part of the reflector of modulator-demodulator, and feedback is connected to the signal input part of the receiver of this modulator-demodulator;
Said two phase-shift networks, being separately positioned on said clock generator correspondence provides on the circuit of local oscillated signal to receiver and reflector.
In the reflector of said modulator-demodulator,, be disposed with module, D/A converter, low pass filter, some grades of amplifiers of emission digital baseband signal according to the trend that transmits;
Said clock generator is through the two-way quadrature local oscillated signal of said phase-shift network generation and the output signal mixing of said low pass filter, and stack obtains the output signal of transmitting terminal then; The output of said amplifier is through said attenuation network, and feedback is connected to the receiver place of said modulator-demodulator, with the said transmitting terminal output signal after the processing and amplifying, respectively as the receiving terminal input signal of said receiver.
In the receiver of said modulator-demodulator,, be disposed with the module of some grades of amplifiers, low pass filter, A/D converter, reception digital baseband signal according to the trend that receives signal;
Said clock generator is through two-way quadrature demodulated signal and the receiving terminal input signal mixing through amplifying that another said phase-shift network produces, the two-way receiving terminal baseband signal that obtains carrying out the mismatch parameter estimation.
Compared with prior art, the calibrating installation of the said modulator-demodulator mismatch of the utility model, its advantage is: the utility model does not need to make up in addition the circuit of modulator-demodulator; Need not increase power consumption yet; With the output of the transmitting terminal before and after phase shift signal, feedback is input to the receiver place and obtains two baseband signals, carries out algebraic operation through the signal that this is received respectively; Realization is to the measurement and the compensation of the phase place and the amplitude offset of transmitting terminal and receiving terminal; Not only remove the influence of those side-play amounts, also increased the speed of modem data transmission, reduced the power consumption of circuit; Can also help to reduce the interference signal intensity of modulator-demodulator and improve image-frequency rejection ratio.
Description of drawings
Fig. 1 is the circuit block diagram of the calibrating installation of the said modulator-demodulator mismatch of the utility model.
Embodiment
The calibrating installation of the said modulator-demodulator mismatch of the utility model is particularly useful for being provided with simultaneously on the modem chip situation of receiver and reflector, to the quadrature of said receiver and reflector mutually amplitude and phase place four kinds do not match and calibrate.
Referring to shown in Figure 1, said calibrating installation is included in attenuation network and two phase-shift networks of setting up in reflector and the receiver of modulator-demodulator; Wherein, said attenuation network is with the signal output part of the reflector of modulator-demodulator, and feedback is connected to the signal input part of the receiver of this modulator-demodulator; Said two phase-shift networks, being separately positioned on said clock generator correspondence provides on the circuit of local oscillated signal to receiver and reflector.
Concrete, in the transmitter portion of this modulator-demodulator,, be disposed with module, D/A converter, low pass filter, some grades of amplifiers of emission digital baseband signal according to the trend that transmits; Said clock generator is connected with the output of said low pass filter through phase-shift network.Orthogonal signalling by the local oscillated signal after the phase shift; To modulating through baseband signal after the handled of D/A converter, low pass filter; The transmitting terminal output signal that obtains after amplifying through signal again feeds back the receiver that inputs to said modulator-demodulator via attenuation network.
The receiver part of said modulator-demodulator according to the trend that receives signal, is disposed with the module of some grades of amplifiers, low pass filter, A/D converter, reception digital baseband signal; Said clock generator is connected with the input of said low pass filter through another phase-shift network.By the orthogonal signalling of local oscillated signal, the input signal after amplifying is carried out demodulation, obtain digital baseband signal after doing handled by said low pass filter, A/D converter again.
Below in conjunction with the structure of block diagram of calibrating installation shown in Figure 1, the calibration steps of the said modulator-demodulator mismatch of the utility model is described, comprise following steps:
In the transmitter portion of step 1, modulator-demodulator, clock generator is the local oscillated signal LO of its output, to the transmitting terminal baseband signal after process filtering and the D/A conversion process
V TX, BB Modulate, and after signal amplifies, obtain transmitting terminal output signal
Step 2, transmitting terminal is exported signal
pass through attenuation network; Feedback inputs to the receiver part of this modulator-demodulator, as its input signal
;
Step 3, clock generator are the local oscillated signal LO of the corresponding output of receiver, to the receiving terminal input signal through processing and amplifying
Carry out demodulation, filtering obtains the receiving terminal baseband signal
V RX, BB
Step 4, be the local oscillated signal LO that provides of said reflector and the baseband signal of said reflector with clock generator
V TX, BB Carry out phase shift simultaneously;
Step 5, the baseband signal after using the local oscillated signal LO after the phase shift in the step 4 as phase shift
V TX, BB Modulate, and the transmitting terminal output signal after after signal amplifies, obtaining phase shift
Step 6, similar with step 2; The transmitting terminal that modulation after the phase shift obtains is exported signal
; Also input to the receiver part of modulator-demodulator, as the input signal after the phase shift
through the attenuation network feedback;
Step 7, similar with step 3 is the local oscillated signal LO of the corresponding output of receiver by clock generator, to the receiving terminal input signal through obtaining after the phase shift of processing and amplifying
Carry out demodulation, filtering obtains the receiving terminal baseband signal after the phase shift
V RX, BB
Step 8, according to the receiving terminal baseband signal before and after the phase shift that obtains respectively in step 3, the step 7
V RX, BB , the quadrature that calculates said receiver and reflector is four kinds of mismatch parameters of amplitude and phase place mutually.
Below provided concrete computing formula based on said method.Suppose what clock generator in the step 1 produced, four tunnel orthogonal signalling that are used for the local oscillated signal LO of transmitting terminal signal modulation do
Wherein,
is the frequency of oscillation of local oscillated signal LO.
If do not have mismatch at transmitting terminal, through the transmitting terminal output signal of local oscillated signal LO mixing should for
Wherein,
is the base-band signal frequency of input.
Owing to do not match in the transmitting terminal existence, after baseband signal was modulated through local oscillated signal LO, the transmitting terminal output signal that obtains was following:
Wherein, The amplitude mismatch parameter of
expression reflector, the phase mismatch parameter of
expression reflector.
Above-mentioned unmatched transmitting terminal output signal is approximately
Of step 2, said transmitting terminal output signal
is fed back in the receiver that is input to this modulator-demodulator as its input signal
.Suppose what clock generator in the step 3 produced, four tunnel orthogonal signalling that are used for the local oscillated signal LO of receiving end signal demodulation are:
Wherein,
is the frequency of oscillation of local oscillated signal LO, and
is the phase place of local oscillated signal.
After the input signal of receiving terminal
the process receiving terminal local oscillated signal LO mixing, demodulation obtains the baseband signal of receiving terminal:
Afterwards, of step 4 ~ 5, to the local oscillated signal LO and the baseband signal V of reflector
TX, BBCarry out phase shift simultaneously through phase-shift network, and be the baseband signal after the phase shift by the local oscillated signal LO after the phase shift
V TX, BB Modulate, the transmitting terminal output signal that obtains this moment after the phase shift does
（8）
In step 6 ~ 7; Transmitting terminal after said phase shift output signal
is also fed back to receiver; After the same demodulation through formula 5 said receiver local oscillation signal LO, the baseband signal that receive this moment will become:
Of step 8; In order to draw the mismatch parameter
in the modulation process;
;
;
supposes
At this moment; Carry out algebraic operation to the received signal; Be about in the formula 7 substitution formula 11; We just can obtain said mismatch parameter
;
;
, the concrete numerical value of
.Thereby can when signal transmits and receives, mismatch be compensated according to those mismatch parameters.
Thereby the utility model does not need to make up in addition the circuit of modulator-demodulator, need not increase power consumption yet; With the output of the transmitting terminal before and after phase shift signal, feedback is input to the receiver place and obtains two baseband signals, carries out algebraic operation through the signal that this is received respectively; Realization is to the measurement and the compensation of the phase place and the amplitude offset of transmitting terminal and receiving terminal; Not only remove the influence of those side-play amounts, also increased the speed of modem data transmission, reduced the power consumption of circuit; Can also help to reduce the interference signal intensity of modulator-demodulator and improve image-frequency rejection ratio.
Although the content of the utility model has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to the restriction to the utility model.After those skilled in the art have read foregoing, for the multiple modification of the utility model with to substitute all will be conspicuous.Therefore, the protection range of the utility model should be limited appended claim.
Claims (3)
1. the calibrating installation of a modulator-demodulator mismatch is characterized in that, said calibrating installation is included in attenuation network and two phase-shift networks of setting up in reflector and the receiver of modulator-demodulator;
Wherein, said attenuation network is with the signal output part of the reflector of modulator-demodulator, and feedback is connected to the signal input part of the receiver of this modulator-demodulator;
Said two phase-shift networks, being separately positioned on said clock generator correspondence provides on the circuit of local oscillated signal to receiver and reflector.
2. the calibrating installation of modulator-demodulator mismatch according to claim 1; It is characterized in that; In the reflector of said modulator-demodulator,, be disposed with module, D/A converter, low pass filter, some grades of amplifiers of emission digital baseband signal according to the trend that transmits;
Said clock generator is through the two-way quadrature local oscillated signal of said phase-shift network generation and the output signal mixing of said low pass filter, and stack obtains the output signal of transmitting terminal then; The output of said amplifier is through said attenuation network, and feedback is connected to the receiver place of said modulator-demodulator, with the said transmitting terminal output signal after the processing and amplifying, respectively as the receiving terminal input signal of said receiver.
3. like the calibrating installation of the said modulator-demodulator mismatch of claim 2; It is characterized in that; In the receiver of said modulator-demodulator,, be disposed with the module of some grades of amplifiers, low pass filter, A/D converter, reception digital baseband signal according to the trend that receives signal;
Said clock generator is through two-way quadrature demodulated signal and the receiving terminal input signal mixing through amplifying that another said phase-shift network produces, the two-way receiving terminal baseband signal that obtains carrying out the mismatch parameter estimation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201610020U CN202121602U (en) | 2011-05-19 | 2011-05-19 | Device for calibrating mismatch of modem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201610020U CN202121602U (en) | 2011-05-19 | 2011-05-19 | Device for calibrating mismatch of modem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202121602U true CN202121602U (en) | 2012-01-18 |
Family
ID=45462638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201610020U Expired - Lifetime CN202121602U (en) | 2011-05-19 | 2011-05-19 | Device for calibrating mismatch of modem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202121602U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340467A (en) * | 2011-05-19 | 2012-02-01 | 乐鑫信息科技（上海）有限公司 | Device and method for calibrating mismatched modem |
| WO2022000529A1 (en) * | 2020-07-03 | 2022-01-06 | 锐迪科创微电子（北京）有限公司 | Amplitude offset calibration method, device and storage medium |
-
2011
- 2011-05-19 CN CN2011201610020U patent/CN202121602U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340467A (en) * | 2011-05-19 | 2012-02-01 | 乐鑫信息科技（上海）有限公司 | Device and method for calibrating mismatched modem |
| WO2022000529A1 (en) * | 2020-07-03 | 2022-01-06 | 锐迪科创微电子（北京）有限公司 | Amplitude offset calibration method, device and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 403, No. 2966 Jinke Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee after: Lexin Information Technology (Shanghai) Co., Ltd. Address before: Room 403, No. 2966 Jinke Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee before: Yue Xin information technology (Shanghai) Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |
|
| CX01 | Expiry of patent term |