CN1353883A - Heterodyne mobile radio telephone receiver having simplified input filtering - Google Patents
Heterodyne mobile radio telephone receiver having simplified input filtering Download PDFInfo
- Publication number
- CN1353883A CN1353883A CN 00808272 CN00808272A CN1353883A CN 1353883 A CN1353883 A CN 1353883A CN 00808272 CN00808272 CN 00808272 CN 00808272 A CN00808272 A CN 00808272A CN 1353883 A CN1353883 A CN 1353883A
- Authority
- CN
- China
- Prior art keywords
- pass filter
- filter
- mobile radio
- low
- radio telephone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Abstract
The simplified design of a heterodyne mobile radio telephone receiver provides for a front-end filter (FF) with a high selectivity in the image frequency range whose adjacent channel selectivity is distinct in such a way that a simple high-pass filter or low-pass filter is sufficient in the interstage area. As an alternative to this simple high-pass or low-pass filter, it is also possible to have a software-like offset compensation. This simplified design leads to significant advantages with regard to costs and space.
Description
In heterodyne mobile radio telephone receiver, on picture frequency, there is an adjacent sink.Perhaps, receiver has and resembles sensitivity identical on operating frequency in this adjacent sink.On this frequency, require a very strong filtering in order to prevent to disturb.For example this adds up to 71dB in the GSM-900 system.For this purpose is used two ceramic filters or two Surface Acoustic Wave Filter so far usually.These filters typically are designed to band pass filter in present settling mode, it is used to suppress picture frequency.In governable technology so far, the selectivity of single band pass filter is inadequate on picture frequency, and therefore must use two band pass filters.
First band pass filter (FF), front end filter be to low selectivity of this general domination and lower insertion decay in useful band, and be placed on the front of low-noise preamplifier (LAN).Second band pass filter (IF), so-called inter-stage filter, the domination than high selectivity and be placed on preamplifier and first frequency mixer (first frequency mixer) between.Can realize enough selectivity of picture frequency with the application of two band pass filters in the front end scope or in the inter-stage scope.
The present invention is based on this task, provide the low cost solution as far as possible of this problem, comparing with the known solution with two band pass filters in addition has lower locational requirement.Solve this task according to the present invention by the heterodyne mobile radio telephone receiver that has according to the feature of one of demand for independence.
Fig. 1 has schematically pointed out the structure according to beat receiver of the present invention.
Fig. 2 has schematically pointed out the structure of common so far beat receiver.
Describe the present invention in detail by means of preferred embodiment and according to figure below.
According to development newer in the scope of band pass filter, now new-type band pass filter ratio attainable band pass filter so far has selectivity higher on picture frequency.Inventor's extensive experiment and emulation draw, can construct beat receiver in a simplified manner with this new-type band pass filter, resemble so far in principle as the inter-stage filter, that is to say as the band pass filter between the preamplifier and first mixer stage the same, the new salient point according to front end filter of the present invention is high adjacentchannel selectivity, does not also use this front end filter up to now.
Front end filter is enough in the inter-stage scope by using so, that is to say to use the low pass filter of simplifying or also can use a high pass filter between the low-noise preamplifier and first mixer stage.An other possibility is, uses the migration according to software to replace remaining necessary filtering.According to solution of the present invention, the new-type band pass filter of above-mentioned form can satisfy the compatible requirement of the power that in the GSM scope Surface Acoustic Wave Filter is proposed thus in addition, and this Surface Acoustic Wave Filter should be used in the front end scope.
Up to now, that is to say before the present invention, only realize mobile radio receiver with a band pass filter.This receiver is constructed as beat receiver, or with the work of so-called image refusal frequency mixer, it has higher current drain certainly.These shortcomings can be avoided by solution according to the present invention, and crucial expense advantage and position advantage can be realized.
Point out heterodyne system wireless receiver, special heterodyne system wireless receiver that following in principle structure is present as Fig. 2:
The output signal of antenna is supplied to a front end filter, and it is connected the front of a low-down preamplifier of typical noise.The output signal of low noise preamplifier is supplied to an inter-stage filter, and its output signal is supplied to first mixer stage (first frequency mixer) again.
The salient point of this front end filter in common version generally is lower selectivity and lower insertion decay in useful band, this inter-stage filter is had higher selectivity.
Be based upon the new-type heterodyne system wireless receiver of describing among Fig. 1 in simple mode thus according to the present invention, the band pass filter that is high selectivity is as front end filter, its filtering characteristic is so good, so that in the inter-stage scope, just only also need a high pass filter or a low pass filter between the low noise preamplifier and first frequency mixer.
It also is possible replacing this low pass filter or migration according to software of high pass filter in the inter-stage scope.
Claims (3)
1. heterodyne system wireless receiver, mobile radio receiver particularly, front end filter and a high pass filter with the high selectivity before low noise input amplifier, it is connected after the low noise input amplifier and is connected before first mixer stage.
2. heterodyne system wireless receiver, mobile radio receiver particularly, front end filter and a low pass filter with the high selectivity before low noise input amplifier, it is connected after the low noise input amplifier and is connected before first mixer stage.
3. the heterodyne system wireless receiver that one of requires according to aforesaid right has one after the front end filter of the high selectivity of low noise input amplifier front and a replacement are connected low noise input amplifier and the high pass filter before being connected first mixer stage or the migration of low pass filter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19933267 | 1999-07-15 | ||
| DE19933267.3 | 1999-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1353883A true CN1353883A (en) | 2002-06-12 |
Family
ID=7914941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00808272 Pending CN1353883A (en) | 1999-07-15 | 2000-04-11 | Heterodyne mobile radio telephone receiver having simplified input filtering |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1197002A1 (en) |
| CN (1) | CN1353883A (en) |
| WO (1) | WO2001006667A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433543C (en) * | 2005-05-09 | 2008-11-12 | 凌阳科技股份有限公司 | High carrier inhibited up-conversion mixing system |
| CN103250360A (en) * | 2010-12-15 | 2013-08-14 | 赫希曼汽车通讯有限公司 | Wideband sampling with phase diversity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3701134A1 (en) * | 1987-01-16 | 1988-07-28 | Siemens Ag | Radio receiver with extremely wide bandwidth |
-
2000
- 2000-04-11 EP EP00938480A patent/EP1197002A1/en not_active Withdrawn
- 2000-04-11 WO PCT/DE2000/001109 patent/WO2001006667A1/en not_active Application Discontinuation
- 2000-04-11 CN CN 00808272 patent/CN1353883A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433543C (en) * | 2005-05-09 | 2008-11-12 | 凌阳科技股份有限公司 | High carrier inhibited up-conversion mixing system |
| CN103250360A (en) * | 2010-12-15 | 2013-08-14 | 赫希曼汽车通讯有限公司 | Wideband sampling with phase diversity |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001006667A1 (en) | 2001-01-25 |
| EP1197002A1 (en) | 2002-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |