CN1619970A - Receirer and transmitter matched with said receiver - Google Patents
Receirer and transmitter matched with said receiver Download PDFInfo
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- CN1619970A CN1619970A CN 200310115358 CN200310115358A CN1619970A CN 1619970 A CN1619970 A CN 1619970A CN 200310115358 CN200310115358 CN 200310115358 CN 200310115358 A CN200310115358 A CN 200310115358A CN 1619970 A CN1619970 A CN 1619970A
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- 238000012545 processing Methods 0.000 claims description 57
- 238000001914 filtration Methods 0.000 claims description 42
- 238000002156 mixing Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000000452 restraining effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
A receiver and matched transmitter thereof, which contains RF amplifier, first frequency variable local oscillator, first frequency converter, first intermediate frequency filter, second frequency variable local oscillator, second frequency converter, second intermediate frequency filter and CPU. The transmitter contains first intermediate frequency filter, first frequency variable local oscillator, first frequency converter, second intermediate frequency filter, second frequency variable local oscillator, second frequency converter, first RF filter and CPU. Said invention can receive and transmit intermediate frequency band signal by adjusting the output frequency of first and second frequency variable local oscillator and combining with two stage intermediate filter.
Description
Technical field
The signal that the present invention relates to communication field receives and lift-off technology, refers to a kind of receiver and and the matched transmitter of described receiver especially.
Background technology
In existing communication system, when during at the processing receiving and transmitting signal, handling to the signal of different bandwidth with the radio receipts/sender of software definition.For example receipts/the sender of different carrier number, perhaps the different systems signal of different bandwidth situation under the same standard.
Generally use the band pass filter of a plurality of different bandwidths on receipts of the prior art/sender channel simultaneously, use switch to switch the conversion that these filters are realized intermediate-frequency bandwidth.With WCDMA base station multiple carrier receipts/sender is example, and as shown in Figure 1, can select bandwidth when 1,2,3,4 carrier waves for use is 5MHz, 10MHz, 15MHz, 20MHz totally 4 kinds of band pass filters, and the carrier number of working according to the base station switches intermediate-frequency filter.The shortcoming of this kind receipts/sender is: 1, cost height, and needs use the band pass filter of a plurality of intermediate-frequency bandwidths; 2, circuit complexity needs switch that filter is switched; 3, intermediate-frequency bandwidth when needing the intermediate-frequency channel of different bandwidth again, needs to increase filter and port number by selected several filter decisions.When for example needing under 3 carrier waves 14MHz bandwidth in the WCDMA receipts/sender, original 15MHz band pass filter just has been not suitable for, and need increase the band pass filter of 14MHz bandwidth newly.
Another kind method is only to use a kind of filter of intermediate-frequency bandwidth on the analog intermediate frequency passage, this filter must be taken into account all intermediate-frequency bandwidth, therefore the bandwidth of intermediate-frequency filter is chosen for the signal bandwidth of maximum possible, and for example reception of the WCDMA receipts/sender of 4 carrier waves and launching simulation passage are selected the band pass filter of 20MHz bandwidth for use.For other littler bandwidth, in analog channel, do not carry out Filtering Processing, realize other intermediate-frequency bandwidth but in numeric field, carry out Filtering Processing, for example realize 5MHz, 10MHz, 15MHz etc.These handle receiver be with analog to digital converter analog signal is transformed to digital signal after, transmitter is to be to handle before the analog signal with digital to analog converter with digital signal conversion.The shortcoming of this kind receipts/sender is: because analog filter uses maximum signal bandwidth, when the little bandwidth signal of processing is handled, do not restrain ability to neighboring trace with every the road, at this moment analog to digital converter in the receiver and the digital to analog converter in the transmitter need very big dynamic range.In order to realize Signal Processing under this state, usually need to use high dynamic analog to digital converter device in the receiver design, and use the simulation automatic gain control circuit to adjust signal level, make performance of analog-to-digital convertor perform to maximum to the best incoming signal level of analog to digital converter.Transmitter need use high dynamic digital to analog converter device, and the analog signal that makes it to export is at neighboring trace and leak very little every the road.This class circuit complexity, the cost height.
Summary of the invention
In order to overcome above-mentioned shortcoming of the prior art, the invention provides a kind of receiver and and the matched transmitter of described receiver.
For this reason, the invention provides following technical scheme:
A kind of receiver includes first radio frequency amplifier, first frequency variable local oscillator, first frequency converter, first intermediate-frequency filter, second frequency variable local oscillator, second frequency converter, second intermediate-frequency filter and central processing unit; Described central processing unit is controlled the first variable ratio frequency changer local oscillator and the second variable ratio frequency changer local oscillator, produces first local oscillated signal and second local oscillated signal; Described received signal and described first local oscillated signal through first radio frequency amplifier exported to first intermediate-frequency filter after through the first frequency converter mixing; This first intermediate-frequency filter carries out exporting to second frequency converter after the Filtering Processing to its input signal; This second frequency converter with the input signal and the second local oscillated signal mixing after, export to second intermediate-frequency filter and carry out the Filtering Processing second time, receive signal after handling by second intermediate-frequency filter output.
A kind of transmitter includes first intermediate-frequency filter, first frequency variable local oscillator, first frequency converter, second intermediate-frequency filter, second frequency variable local oscillator, second frequency converter, first radio-frequency filter and central processing unit;
Described central processing unit is controlled the first variable ratio frequency changer local oscillator and the second variable ratio frequency changer local oscillator, produces first local oscillated signal and second local oscillated signal; Describedly finish Filtering Processing for the first time, export to second intermediate-frequency filter after through the first frequency converter mixing, carry out the Filtering Processing second time with described first local oscillated signal through transmitting of first intermediate-frequency filter; By the second intermediate-frequency filter output signal and describedly after second local oscillated signal is through the second frequency converter mixing, export to first radio-frequency filter, the signal after handling by first radio-frequency filter output emission.
Described first intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the end of input signal on frequency domain restrained; Described second intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the other end of input signal on frequency domain restrained.
Described first intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
Described second intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
Described central controller can be controlled two local oscillator output signal frequency.
Described central controller is according to the feature of two-stage intermediate-frequency filter, and the intermediate-frequency bandwidth that needs, and coordinates the output frequency of two local oscillators of control.
The present invention is by adjusting the output frequency of first and second frequency variable local oscillator, cooperate with the two-stage intermediate-frequency filter, realize the received signal of variable intermediate frequency bandwidth and the processing that transmits, the stepping of local oscillator is depended in the variation stepping of intermediate-frequency bandwidth, can accomplish to adjust very flexibly.The present invention adopts the double conversion structure, and it is simple to have a circuit, and cost is low, adjusts advantage flexibly, can adapt to different the reception and the Filtering Processing of transmitted bandwidth signal.
Description of drawings
Fig. 1 is the intermediate frequency filtering structural representation of the variable receiver/transmitter of a kind of intermediate-frequency bandwidth of the prior art;
Fig. 2 is a variable intermediate frequency bandwidth receiver structure schematic diagram of the present invention;
Fig. 3 is the signal processing schematic diagram in the receiver of the present invention;
Fig. 4 is a variable intermediate frequency bandwidth transmitter architecture schematic diagram of the present invention;
Fig. 5 is the signal processing schematic diagram in the transmitter of the present invention.
Embodiment
Receiver structure of the present invention as shown in Figure 2.Received signal enters frequency converter 1 after through a low noise amplifier, with enter intermediate-frequency filter 1 behind local oscillator 1 signal mixing, in intermediate-frequency filter 1, carry out to received signal entering frequency converter 2 after the 1st Filtering Processing, with enter intermediate-frequency filter 2 behind local oscillator 2 signal mixings, carry out Filtering Processing the 2nd time, export double conversion and filtered signal afterwards.
The setting of filter and the setting of local oscillation signal are keys of the present invention, and its frequency translation and Filtering Processing process are as shown in Figure 3.
With the WCDMA base station receiver is example, the received signal centre frequency is 1950MHz, local oscillator 1 output 1500MHz, intermediate-freuqncy signal 1 through frequency converter 1 output 450MHz, this signal enters intermediate-frequency filter 1, it is carried out Filtering Processing, it on the schematic diagram wherein a kind of Filtering Processing mode, can adopt the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters to realize, an emphasis end of passband is to received signal restrained filtering, is that the high-end of passband signal restrained in this example.Intermediate-frequency filter 1 high-end supression breakover point is 452.5MHz.Filtered signal enters frequency converter 2, the frequency of local oscillator 2 signals is 300MHz, an intermediate-freuqncy signal 2 through frequency converter 2 output 150MHz, this signal enters intermediate-frequency filter 2, it is carried out Filtering Processing, it on the schematic diagram wherein a kind of Filtering Processing mode, also can adopt the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters to realize, an emphasis end of passband is to received signal restrained filtering, is that the low side of passband signal is restrained in this example.It is 147.5MHz that intermediate-frequency filter 2 low sides are restrained breakover point.Signal after the Filtering Processing is by intermediate-frequency filter 2 outputs.From the overall result of whole signal processing, receiver is that to have carried out bandwidth be the Filtering Processing of 5MHz for the signal of 1950MHz to centre frequency.The receiver channel equivalent bandwidth is 5MHz.
When the signal of other intermediate-frequency bandwidth of needs, coordinate the frequencies that two local oscillators outputs of control are fit to and to realize, and do not need filter on the conversion receive path.For example will realize that bandwidth is that the intermediate-frequency bandwidth of 8MHz receive to be handled, the frequency that can change local oscillator 1 is 1501.5MHz, is 448.5MHz in the centre frequency of intermediate-frequency filter 1 place's signal, and its spacing apart from intermediate-frequency filter 1 high-end supression breakover point 452.5MHz is 4MHz; The frequency that changes local oscillator 2 is 297MHz, and the centre frequency of received signal at intermediate-frequency filter 2 places is 151.5MHz, and its spacing of restraining breakover point 147.5MHz apart from intermediate-frequency filter 2 low sides is 4MHz; Signal after the Filtering Processing is by intermediate-frequency filter 2 outputs.From the overall result of whole signal processing, receiver is that to have carried out bandwidth be the Filtering Processing of 8MHz for the signal of 1950MHz to centre frequency.What receiver was exported is that bandwidth is the signal of 8MHz.The outer effect of restraining of its band receives under the bandwidth identical with original 5MHz.
Central processing unit is according to the setting of bandwidth, received signal frequency and the intermediate-frequency filter of needs, adjust the output signal frequency of two local oscillators, make it to reach the distance that needs and realize different bandwidth, implement the Filtering Processing of different bandwidth apart from the supression turnover frequency of two intermediate-frequency filters.
The selection of two intermediate-frequency filters only need be satisfied separately, and pass band width has enough supression abilities to get final product above the maximum intermediate-frequency bandwidth of receiver needs at filter one end.
Receiver is by double conversion, and twice filtering is combined into the wide processing that accepts filter of equivalence band passband.Realized the analog intermediate frequency Filtering Processing of any bandwidth.
Transmitter architecture of the present invention as shown in Figure 4.Transmit through entering frequency converter 1 behind the 1st intermediate-frequency filter, with enter intermediate-frequency filter 2 behind local oscillator 1 signal mixing, in intermediate-frequency filter 2, carry out entering frequency converter 2 after the 2nd Filtering Processing to transmitting, go into radio frequency filter 1 with local oscillator 2 signal mixings are laggard, export double conversion and filtered transmitting afterwards.
The setting of filter and the setting of local oscillation signal are keys of the present invention, and its frequency translation and Filtering Processing process are as shown in Figure 5.
With the WCDMA base station transmitter is example, the centre frequency that transmits is 2150MHz, the frequency of the 1st intermediate frequency is 50MHz, transmit and enter intermediate-frequency filter 1, it is carried out Filtering Processing, is wherein a kind of Filtering Processing mode on the schematic diagram, can adopt the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters to realize, emphasis is restrained filtering to an end of transmit signal passband, is that the low side of passband signal is restrained in this example.It is 47.5MHz that intermediate-frequency filter 1 low side is restrained breakover point.Filtered signal enters frequency converter 2, the frequency of local oscillator 1 signal is 350MHz, intermediate-freuqncy signal through frequency converter 1 output 400MHz, enter intermediate-frequency filter 2, it is carried out Filtering Processing, it on the schematic diagram wherein a kind of Filtering Processing mode, also can adopt the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters to realize, emphasis is restrained filtering to an end of transmit signal passband, is that the high-end of passband signal restrained in this example.Intermediate-frequency filter 2 high-end supression breakover points are 402.5MHz.Filtered signal enters frequency converter 2, and the frequency of local oscillator 2 signals is 1750MHz, and through the radiofrequency signal of frequency converter 2 output 2150MHz, this signal enters radio-frequency filter 1, and it is carried out exporting after the Filtering Processing.From the overall result of whole signal processing, transmitter is that to have carried out bandwidth be the Filtering Processing of 5MHz for the signal of 2150MHz to centre frequency.What transmitter was exported is that bandwidth is the signal of 5MHz.
When the signal of other intermediate-frequency bandwidth of needs, coordinating two suitable frequencies of local oscillator output of control can realize, for example to realize that bandwidth is the intermediate-frequency bandwidth emission processing of 14MHz, can change the signal center frequency of exporting to intermediate-frequency filter 1 is 54.5MHz, and its spacing of restraining breakover point 47.5MHz apart from intermediate-frequency filter 1 low side is 7MHz; The frequency that changes local oscillator 2 is 341MHz, is 395.5MHz in the centre frequency of intermediate-frequency filter 2 place's signals, and its spacing apart from intermediate-frequency filter 2 high-end supression breakover point 402.5MHz is 7MHz; Signal after the Filtering Processing again with local oscillation signal 21754.5MHZ signal mixing, upconverts to radiofrequency signal 2150MHz output by intermediate-frequency filter 2.From the overall result of whole signal processing, transmitter is that to have carried out bandwidth be the Filtering Processing of 14MHz for the signal of 2150MHz to centre frequency.What transmitter was exported is that bandwidth is the signal of 14MHz.Identical under the outer effect of restraining of its band and the 5MHz transmitted bandwidth originally.
The selection of two intermediate-frequency filters only need be satisfied separately, and pass band width has enough supression abilities to get final product above the maximum intermediate-frequency bandwidth of transmitter needs at filter one end.
Transmitter is by double conversion, and twice filtering is combined into the wide processing that accepts filter of equivalence band passband.Realized the analog intermediate frequency Filtering Processing of any bandwidth.
Claims (12)
1, a kind of receiver, it is characterized in that, include first radio frequency amplifier, first frequency variable local oscillator, first frequency converter, first intermediate-frequency filter, second frequency variable local oscillator, second frequency converter, second intermediate-frequency filter and central processing unit;
Described central processing unit is controlled the first variable ratio frequency changer local oscillator and the second variable ratio frequency changer local oscillator, produces first local oscillated signal and second local oscillated signal; Described received signal and described first local oscillated signal through first radio frequency amplifier exported to first intermediate-frequency filter after through the first frequency converter mixing; This first intermediate-frequency filter carries out exporting to second frequency converter after the Filtering Processing to its input signal; This second frequency converter with the input signal and the second local oscillated signal mixing after, export to second intermediate-frequency filter and carry out the Filtering Processing second time, receive signal after handling by second intermediate-frequency filter output.
2, receiver as claimed in claim 1 is characterized in that: described first intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the end of input signal on frequency domain restrained; Described second intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the other end of input signal on frequency domain restrained.
3, receiver as claimed in claim 1 or 2 is characterized in that: described first intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
4, receiver as claimed in claim 1 or 2 is characterized in that: described second intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
5, receiver as claimed in claim 1 or 2 is characterized in that: described central controller can be controlled two local oscillator output signal frequency.
6, receiver as claimed in claim 1 or 2 is characterized in that: described central controller is according to the feature of two-stage intermediate-frequency filter, and the intermediate-frequency bandwidth that needs, and coordinates the output frequency of two local oscillators of control.
7, a kind of transmitter, it is characterized in that, include first intermediate-frequency filter, first frequency variable local oscillator, first frequency converter, second intermediate-frequency filter, second frequency variable local oscillator, second frequency converter, first radio-frequency filter and central processing unit;
Described central processing unit is controlled the first variable ratio frequency changer local oscillator and the second variable ratio frequency changer local oscillator, produces first local oscillated signal and second local oscillated signal; Describedly finish Filtering Processing for the first time, export to second intermediate-frequency filter after through the first frequency converter mixing, carry out the Filtering Processing second time with described first local oscillated signal through transmitting of first intermediate-frequency filter; By the second intermediate-frequency filter output signal and describedly after second local oscillated signal is through the second frequency converter mixing, export to first radio-frequency filter, the signal after handling by first radio-frequency filter output emission.
8, transmitter as claimed in claim 7 is characterized in that: described first intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the end of input signal on frequency domain restrained; Described second intermediate-frequency filter has at the other at least one end of its passband has the degree of depth to restrain, and the other end of input signal on frequency domain restrained.
9, as claim 7 or 8 described transmitters, it is characterized in that: described first intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
10, as claim 7 or 8 described transmitters, it is characterized in that: described second intermediate-frequency filter can be the junction filter of low pass filter, high pass filter, band pass filter, band stop filter or these filters.
11, as claim 7 or 8 described transmitters, it is characterized in that: described central controller can be controlled two local oscillator output signal frequency.
12, as claim 7 or 8 described transmitters, it is characterized in that: described central controller is according to the feature of two-stage intermediate-frequency filter, and the intermediate-frequency bandwidth that needs, and coordinates the output frequency of two local oscillators of control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101153580A CN100446428C (en) | 2003-11-19 | 2003-11-19 | Receirer and transmitter matched with said receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101153580A CN100446428C (en) | 2003-11-19 | 2003-11-19 | Receirer and transmitter matched with said receiver |
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| Publication Number | Publication Date |
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| CN1619970A true CN1619970A (en) | 2005-05-25 |
| CN100446428C CN100446428C (en) | 2008-12-24 |
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| CNB2003101153580A Expired - Lifetime CN100446428C (en) | 2003-11-19 | 2003-11-19 | Receirer and transmitter matched with said receiver |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411312C (en) * | 2005-07-06 | 2008-08-13 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| US8139160B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Television tuner with double quadrature mixing architecture |
| US8139159B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Single down-conversion television tuner |
| WO2012051936A1 (en) * | 2010-10-19 | 2012-04-26 | 中国移动通信集团公司 | Base station device |
| US8212943B2 (en) | 2006-10-25 | 2012-07-03 | Mstar Semiconductor, Inc. | Triple-conversion television tuner |
| CN104135296A (en) * | 2014-07-12 | 2014-11-05 | 无锡中星微电子有限公司 | Adjustable intermediate frequency wireless receiver and Bluetooth module |
| CN105785138A (en) * | 2016-05-12 | 2016-07-20 | 北京森馥科技股份有限公司 | Frequency-selective electromagnetic radiation monitor |
| CN105897296A (en) * | 2015-01-26 | 2016-08-24 | 泉州市铁通电子设备有限公司 | Mine ultra-low-frequency two-way communication equipment |
| CN111313838A (en) * | 2020-03-04 | 2020-06-19 | 昆山立讯射频科技有限公司 | Non-mechanical variable bandwidth filtering system and control method thereof |
| CN113014273A (en) * | 2021-01-21 | 2021-06-22 | 海能达通信股份有限公司 | Self-adaptive anti-interference method and self-adaptive anti-interference device |
| TWI733707B (en) * | 2015-10-29 | 2021-07-21 | 美商蘭姆研究公司 | Systems and methods for filtering radio frequencies from a signal of a thermocouple and controlling a temperature of an electrode in a plasma chamber |
| CN115529056A (en) * | 2022-06-28 | 2022-12-27 | 南京源兴智达信息科技有限公司 | Receiver based on decision-oriented noncoherent Viterbi demodulation algorithm |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11164218A (en) * | 1997-11-26 | 1999-06-18 | Hitachi Ltd | Television signal receiver |
| JP2001285033A (en) * | 2000-03-29 | 2001-10-12 | Sony Corp | Synthesizer receiver |
| CN1440149A (en) * | 2003-02-28 | 2003-09-03 | 东方通信科技发展有限公司 | Primary CDMA variable frequency transmitting system with digital modulation |
-
2003
- 2003-11-19 CN CNB2003101153580A patent/CN100446428C/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411312C (en) * | 2005-07-06 | 2008-08-13 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| US8139160B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Television tuner with double quadrature mixing architecture |
| US8139159B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Single down-conversion television tuner |
| US8212943B2 (en) | 2006-10-25 | 2012-07-03 | Mstar Semiconductor, Inc. | Triple-conversion television tuner |
| WO2012051936A1 (en) * | 2010-10-19 | 2012-04-26 | 中国移动通信集团公司 | Base station device |
| CN102457858A (en) * | 2010-10-19 | 2012-05-16 | 中国移动通信集团公司 | Base station equipment |
| CN102457858B (en) * | 2010-10-19 | 2014-05-07 | 中国移动通信集团公司 | Base station equipment |
| CN104135296A (en) * | 2014-07-12 | 2014-11-05 | 无锡中星微电子有限公司 | Adjustable intermediate frequency wireless receiver and Bluetooth module |
| CN104135296B (en) * | 2014-07-12 | 2017-03-15 | 无锡中星微电子有限公司 | Adjustable mean frequency wireless receiver and bluetooth module |
| CN105897296A (en) * | 2015-01-26 | 2016-08-24 | 泉州市铁通电子设备有限公司 | Mine ultra-low-frequency two-way communication equipment |
| TWI733707B (en) * | 2015-10-29 | 2021-07-21 | 美商蘭姆研究公司 | Systems and methods for filtering radio frequencies from a signal of a thermocouple and controlling a temperature of an electrode in a plasma chamber |
| US11189452B2 (en) | 2015-10-29 | 2021-11-30 | Lam Research Corporation | Systems and methods for filtering radio frequencies from a signal of a thermocouple and controlling a temperature of an electrode in a plasma chamber |
| CN105785138A (en) * | 2016-05-12 | 2016-07-20 | 北京森馥科技股份有限公司 | Frequency-selective electromagnetic radiation monitor |
| CN111313838A (en) * | 2020-03-04 | 2020-06-19 | 昆山立讯射频科技有限公司 | Non-mechanical variable bandwidth filtering system and control method thereof |
| CN113014273A (en) * | 2021-01-21 | 2021-06-22 | 海能达通信股份有限公司 | Self-adaptive anti-interference method and self-adaptive anti-interference device |
| CN115529056A (en) * | 2022-06-28 | 2022-12-27 | 南京源兴智达信息科技有限公司 | Receiver based on decision-oriented noncoherent Viterbi demodulation algorithm |
| CN115529056B (en) * | 2022-06-28 | 2023-10-03 | 南京源兴智达信息科技有限公司 | Receiver based on decision-oriented incoherent Viterbi demodulation algorithm |
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| CN100446428C (en) | 2008-12-24 |
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