CN104980383B - Local oscillator leakage of transmitter reduces system - Google Patents
Local oscillator leakage of transmitter reduces system Download PDFInfo
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- CN104980383B CN104980383B CN201510431589.5A CN201510431589A CN104980383B CN 104980383 B CN104980383 B CN 104980383B CN 201510431589 A CN201510431589 A CN 201510431589A CN 104980383 B CN104980383 B CN 104980383B
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Abstract
Local oscillator leakage of transmitter, which reduces system, includes current source module, Digital Logic control module and comparator；The comparator is used for the DC maladjustment signal for gathering wave filter output, and according to one feedback control signal of DC maladjustment signal output；The Digital Logic control module is used for the keying that the first polarity switch sp and the second polarity switch sn of control current source module are corresponded to according to feedback control signal, and a mode is gradually added to control the switch S1 of current source module to the open/close states of switch Sm using binary system, until detecting that saltus step occurs for feedback control signal, the switch S1 of current flow source module is pinned to the open/close states of switch Sm；Current source module carries out DC compensation with caused current value under current switch S1 to the open/close states for switching Sm to wave filter.The present invention can calibration transmitter automatically DC maladjustment signal, so as to reduce local oscillator leakage.
Description
Technical field
The present invention relates to a kind of local oscillator leakage of transmitter to reduce system.
Background technology
Modern communication technology is maked rapid progress, and various wireless communication standards emerge in an endless stream.In transmitters, local oscillator leakage is to lead
One of an important factor for causing transmitter output signal degradation.
As shown in Figure 1, one of the reason for causing local oscillator leakage is due to the prime module electricity before frequency mixer in transmitter
Caused by the device mismatch that road possesses in itself causes DC maladjustment, DC maladjustment is bigger, then local oscillator leakage is bigger；In order to reduce
DC maladjustment, generally increases the size of device to reduce the mismatch of device in transmitters, but in the same of increase device size
When bring is becoming larger for parasitic capacitance, this can extreme influence frequency mixer prime module such as mould such as digital analog converter, wave filter
The stability and gain bandwidth product of amplifier in block.
The content of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of transmitter local oscillator for solving above-mentioned technical problem
Reveal reduction system.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of local oscillator leakage of transmitter reduces system, it includes current source module, Digital Logic control module and comparator；
Current source module include current value with two multiple one by one incremental current source I to current source 2mI, wherein, m is just
Integer；Current source I is to current source 2mOne end of I is grounded, other end difference connecting valve S1 to the one end for switching Sm；Switch S1
To the other end for switching Sm by the first input end VIP of the first polarity switch sp connection wave filters, also pass through the second pole
Property switch sn connection resistance feedback types wave filter the second input terminal；
The end of oppisite phase and in-phase end of comparator connect the first output terminal and the second output terminal of wave filter respectively；The comparator
For gathering the DC maladjustment signal of wave filter output, and according to one feedback control signal of DC maladjustment signal output；
The input terminal connection comparator of Digital Logic control module, each output terminal of digital logic module connect electric current respectively
The switch S1 of source module is to switching Sm, the first polarity switch sp and the second polarity switch sn；
The first polarity that the Digital Logic control module is used to correspond to control current source module according to feedback control signal is opened
Close the keying of sp and the second polarity switch sn, and gradually add a mode to control the switch S1 of current source module to opening using binary system
The open/close states of Sm are closed, until detecting that saltus step occurs for feedback control signal, pin the switch S1 of current flow source module to opening
Close the open/close states of Sm；Current source module is with caused current value under current switch S1 to the open/close states for switching Sm to filtering
Device carries out DC compensation.
Preferably, when feedback control signal is low level signal, Digital Logic control module control current source module
First polarity switch sp is closed and the second polarity switch sn conductings；
When feedback control signal is high level signal, Digital Logic control module controls the first polarity of current source module
Switch sp conductings and the second polarity switch sn is closed；
When feedback control signal jumps to high level signal from low level signal, or low level is jumped to from high level signal
During signal, Digital Logic control module pins the switch S1 of current flow source module to the open/close states of switch Sm.
Beneficial effects of the present invention are at least as follows：
The Digital Logic control mould of the present invention controls what current source module was exported according to the feedback control signal of comparator
Current polarity, and gradually add a mode to be scanned the compensation electric current found current source module and be most suitable for wave filter using binary system
Value, so that current source module provides suitable compensation electric current when transmitter works, so as to reduce local oscillator leakage.
Brief description of the drawings
Fig. 1 is the primary structure schematic diagram of existing transmitter.
Fig. 2 is the structure diagram for the better embodiment that local oscillator leakage of transmitter of the present invention reduces system.
Embodiment
Below in conjunction with attached drawing and embodiment, the present invention is described further：
Fig. 2 is referred to, the present invention relates to a kind of local oscillator leakage of transmitter to reduce system, its better embodiment includes electric current
Source module 101, Digital Logic control module 102 and comparator 103；
Current source module 101 include current value with 2 multiple one by one incremental current source I to current source 2mI, wherein, m is
Positive integer.Current source I is to current source 2mOne end of I is grounded, other end difference connecting valve S1 to the one end for switching Sm；Switch
S1, by the first input end VIP of the first polarity switch sp connection wave filters, also passes through second to the other end for switching Sm
Second input terminal VIN of the wave filter of polarity switch sn connection resistance feedback types；
The end of oppisite phase and in-phase end of comparator 103 connect the first output terminal VON and the second output terminal of wave filter respectively
VOP；The comparator 103 is used for the DC maladjustment signal for gathering wave filter output, and is fed back according to DC maladjustment signal output one
Control signal；During transmitter chip operation, base band conveys direct current signal to wave filter by digital analog converter, wave filter output
Direct current signal includes the DC maladjustment information of digital analog converter and wave filter.
The input terminal connection comparator 103 of Digital Logic control module 102, each output terminal point of digital logic module 102
Not Lian Jie current source module 101 switch S1 to switching Sm, the first polarity switch sp and the second polarity switch sn；
The Digital Logic control module 102 is used to correspond to the first of control current source module 101 according to feedback control signal
The keying of polarity switch sp and the second polarity switch sn, and gradually add a mode to control current source module 101 using binary system
S1 is switched to the open/close states of Sm are switched, until detecting that saltus step occurs for feedback control signal, pins current flow source module 101
Switch S1 to switch Sm open/close states；Current source module 101 is produced with current switch S1 to the open/close states for switching Sm are lower
Raw current value carries out DC compensation to wave filter.
For example, current source module 101 includes switch S1 to S4 is switched, then Digital Logic control module 102 uses binary system
When gradually plus a mode controls current source module 101, Digital Logic control module 102 sends to switch S1 at the t1 moment and extremely switchs
The control signal of S4 is 0001, sends 0010 at the t2 moment, 0011 is sent at the t3 moment, and so on, gradually add by binary system
One mode is scanned control, to find the compensation current that current source module 101 is most suitable for wave filter, when finding suitable benefit
When repaying current value (being determined by the open/close states for switching S1 to switch Sm), saltus step will occur for the level signal that comparator is exported,
At this time, Digital Logic control module 102 is to pin current switch S1 to the control signal for switching S4, so as in the normal work of transmitter
When making, DC maladjustment compensation is carried out to transmitter with the suitable compensation current, so as to reduce local oscillator leakage.
Here it is noted that no matter whether base band inputs when the digital analog converter of existing transmitter and wave filter work
Useful signal can all produce DC maladjustment signal, and the system is selected when transmitter base band does not input useful signal, for transmitting
DC maladjustment caused by machine device mismatch itself, the compensation current for being adapted to the transmitter is searched out with scan mode.In this way, hair
Penetrate after machine normally starts work, you can with the compensation current compensating direct current misalignment signal, let out so as to reduce local oscillator to greatest extent
Dew, while can also improve the stability of transmitter work.
In this way, the present invention can calibration transmitter produces at prime module automatically DC maladjustment, and then reduction local oscillator is let out
Dew.
Wherein, compensation current scope caused by current source module 101 is I~(22m- 1) R4 in I, Fig. 2 is filtering
The feedback resistance of device, the compensation current are finally exported by feedback resistance R4 in the first output terminal VON of wave filter and second
It is I*R4~(2 to hold the differential voltage that VOP is produced2m-1)I*R4。
Preferably, when feedback control signal is low level signal, Digital Logic control module 102 controls current source module
101 the first polarity switch sp is closed and the second polarity switch sn conductings；When feedback control signal is high level signal, numeral
Logic control module 102 controls the first polarity switch sp conductings of current source module 101 and the second polarity switch sn to close.
When feedback control signal jumps to high level signal from low level signal, or low level is jumped to from high level signal
During signal, Digital Logic control module 102 pins the switch S1 of current flow source module to the open/close states of switch Sm.
For those skilled in the art, technical solution that can be as described above and design, make other each
Kind is corresponding to be changed and deforms, and all these change and deform the protection model that should all belong to the claims in the present invention
Within enclosing.
Claims (2)
1. a kind of local oscillator leakage of transmitter reduces system, it is characterised in that：It includes current source module, Digital Logic control module
And comparator；
Current source module include current value with two multiple one by one incremental current source I to current source 2mI, wherein, m is positive integer；
Current source I is to current source 2mOne end of I is grounded, other end difference connecting valve S0 to the one end for switching Sm；Switch S0 is to opening
The other end of Sm is closed by the first input end VIP of the first polarity switch sp connection wave filters, is also opened by the second polarity
Close the second input terminal of the wave filter of sn connection resistance feedback types；
The end of oppisite phase and in-phase end of comparator connect the first output terminal and the second output terminal of wave filter respectively；The comparator is used for
The DC maladjustment signal of wave filter output is gathered, and according to one feedback control signal of DC maladjustment signal output；
The input terminal connection comparator of Digital Logic control module, each output terminal of digital logic module connect current source mould respectively
The switch S0 of block is to switching Sm, the first polarity switch sp and the second polarity switch sn；
The Digital Logic control module is used for the first polarity switch sp that control current source module is corresponded to according to feedback control signal
With the keying of the second polarity switch sn, and a mode is gradually added to control the switch S0 of current source module to switching Sm using binary system
Open/close states, until detecting that saltus step occurs for feedback control signal, pin the switch S0 of current flow source module to switching Sm
Open/close states；Current source module with current switch S0 to switch Sm open/close states under caused current value to wave filter into
Row DC compensation.
2. local oscillator leakage of transmitter as claimed in claim 1 reduces system, it is characterised in that：When feedback control signal is low electricity
During ordinary mail, the first polarity switch sp of Digital Logic control module control current source module is closed and the second polarity switch sn is led
It is logical；
When feedback control signal is high level signal, Digital Logic control module controls the first polarity switch of current source module
Sp is turned on and the second polarity switch sn is closed；
When feedback control signal jumps to high level signal from low level signal, or low level signal is jumped to from high level signal
When, Digital Logic control module pins the switch S0 of current flow source module to the open/close states of switch Sm.
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| CN201510431589.5A CN104980383B (en) | 2015-07-21 | 2015-07-21 | Local oscillator leakage of transmitter reduces system |
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| CN201510431589.5A CN104980383B (en) | 2015-07-21 | 2015-07-21 | Local oscillator leakage of transmitter reduces system |
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| CN104980383A CN104980383A (en) | 2015-10-14 |
| CN104980383B true CN104980383B (en) | 2018-04-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106610685B (en) * | 2015-10-26 | 2018-08-24 | 北京北方华创微电子装备有限公司 | The method and apparatus for adjusting electric power outputting current |
| US10361745B2 (en) | 2017-06-28 | 2019-07-23 | Qualcomm Incorporated | Systems and methods for reducing transmit and receive power via a T/R switch |
| CN110572225B (en) * | 2019-07-18 | 2022-04-15 | 广州润芯信息技术有限公司 | Receiver direct current offset monitoring system, method, electronic device and storage medium |
| CN115529023B (en) * | 2022-11-23 | 2023-04-07 | 南京邮电大学 | Filter circuit with DC offset elimination |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079645A (en) * | 2006-05-25 | 2007-11-28 | 北京六合万通微电子技术有限公司 | Device for eliminating local vibration leakage in the wireless communication transmitter |
| CN101155160A (en) * | 2006-09-29 | 2008-04-02 | 锐迪科微电子（上海）有限公司 | Up-conversion mixer |
| CN101162910A (en) * | 2006-10-10 | 2008-04-16 | 北京六合万通微电子技术有限公司 | Local oscillator leakage automatic eliminator |
| CN103701420A (en) * | 2013-11-27 | 2014-04-02 | 广州润芯信息技术有限公司 | Transmitter gain distribution method and circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7657236B2 (en) * | 2005-08-16 | 2010-02-02 | Broadcom Corporation | Transmitter having reduced local oscillator (LO) leakage by determining direct LO coupling and baseband DC offset |
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2015
- 2015-07-21 CN CN201510431589.5A patent/CN104980383B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079645A (en) * | 2006-05-25 | 2007-11-28 | 北京六合万通微电子技术有限公司 | Device for eliminating local vibration leakage in the wireless communication transmitter |
| CN101155160A (en) * | 2006-09-29 | 2008-04-02 | 锐迪科微电子（上海）有限公司 | Up-conversion mixer |
| CN101162910A (en) * | 2006-10-10 | 2008-04-16 | 北京六合万通微电子技术有限公司 | Local oscillator leakage automatic eliminator |
| CN103701420A (en) * | 2013-11-27 | 2014-04-02 | 广州润芯信息技术有限公司 | Transmitter gain distribution method and circuit |
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| CN104980383A (en) | 2015-10-14 |
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