JPH036108A - Frequency conversion circuit - Google Patents
Frequency conversion circuitInfo
- Publication number
- JPH036108A JPH036108A JP1140445A JP14044589A JPH036108A JP H036108 A JPH036108 A JP H036108A JP 1140445 A JP1140445 A JP 1140445A JP 14044589 A JP14044589 A JP 14044589A JP H036108 A JPH036108 A JP H036108A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- conversion circuit
- frequency conversion
- interference
- 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
Links
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は妨害信号特性を考慮した周波数変換回路に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a frequency conversion circuit that takes into account the characteristics of an interfering signal.
従来の技術
受信用回路には周波数変換回路を用いて構成される回路
が多く用いられる。Conventional technology Receiving circuits often include circuits configured using frequency conversion circuits.
第２図は従来の周波数変換回路を示すものである。第２
図において、１は局部発振回路、６は周波数変換回路、
４は受信信号入力端子、５は出力端子である。FIG. 2 shows a conventional frequency conversion circuit. Second
In the figure, 1 is a local oscillation circuit, 6 is a frequency conversion circuit,
4 is a received signal input terminal, and 5 is an output terminal.
以上のように構成された周波数変換回路について、以下
その動作について説明する。局部発振回路１で生じた局
部発振信号が局部発振信号入力端子２を通して周波数変
換回路６に入力され、受信信号が受信信号入力端子４か
ら周波数変換回路６に入力されると、局部発振信号と受
信信号の差の周波数の信号（中間周波信号）が出力端子
５に生じる。The operation of the frequency conversion circuit configured as described above will be explained below. When the local oscillation signal generated in the local oscillation circuit 1 is input to the frequency conversion circuit 6 through the local oscillation signal input terminal 2 and the received signal is input to the frequency conversion circuit 6 from the reception signal input terminal 4, the local oscillation signal and the received signal are input to the frequency conversion circuit 6 through the local oscillation signal input terminal 2. A signal at the frequency of the difference between the signals (intermediate frequency signal) is produced at the output terminal 5.
発明が解決しようとする課題
しかしながら上記の従来の構成では、受信信号入力端子
４から希望周波数以外の信号、即ち、妨害信号が入力さ
れた場合、希望信号が受信信号入力端子４に入力された
場合と同様に、局部発振信号と妨害信号との差の周波数
の信号が出力端子５に生じてしまう。この出力端子５に
生じた信号が次段に接続される回路に入力された場合、
本来の中間周波信号より比較的大きいと、本来の中間周
波信号を抑圧してしまうことが知られている。その結果
、受信感度が悪化する。Problems to be Solved by the Invention However, in the above conventional configuration, when a signal other than the desired frequency, that is, an interference signal, is input from the received signal input terminal 4, or when a desired signal is inputted to the received signal input terminal 4, Similarly, a signal having a frequency equal to the difference between the local oscillation signal and the interference signal is generated at the output terminal 5. When the signal generated at this output terminal 5 is input to the circuit connected to the next stage,
It is known that if the frequency is relatively larger than the original intermediate frequency signal, the original intermediate frequency signal will be suppressed. As a result, reception sensitivity deteriorates.
本発明は上記従来の問題点を解決するもので、妨害信号
が周波数変換回路に入力された場合に前述の受信感度悪
化を低減させる周波数変換回路を提供することを目的と
する。The present invention solves the above-mentioned conventional problems, and aims to provide a frequency conversion circuit that reduces the aforementioned deterioration of reception sensitivity when an interfering signal is input to the frequency conversion circuit.
課題を解決するための手段
この目的を達成するために、本発明の周波数変換回路は
、周波数変換回路の出力信号に周波数特性をもたせると
いう構成を有している。Means for Solving the Problems In order to achieve this object, the frequency conversion circuit of the present invention has a configuration in which the output signal of the frequency conversion circuit has frequency characteristics.
作用
この構成によって、妨害信号が周波数変換回路に入力さ
れた場合に受信感度悪化を低減させることができる。Effect: With this configuration, deterioration in reception sensitivity can be reduced when an interference signal is input to the frequency conversion circuit.
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。EXAMPLE An example of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例における周波数変換回路の構
成図を示すものである。第１図において、第２図と同一
機能をもつ素子については同一符号を付して説明を省略
する。３は出力信号に周波数特性をもたせた周波数変換
回路である。FIG. 1 shows a configuration diagram of a frequency conversion circuit according to an embodiment of the present invention. In FIG. 1, elements having the same functions as those in FIG. 2 are denoted by the same reference numerals, and explanations thereof will be omitted. 3 is a frequency conversion circuit that gives an output signal a frequency characteristic.
以上のように構成されたトランジスタ回路について、以
下その動作を説明する。The operation of the transistor circuit configured as above will be described below.
まず、受信信号入力端子４に入力された妨害信号と局部
発振信号との周波数の差が本来の中間周波信号の周波数
より高い場合、周波数変換回路に本来の中間周波信号の
周波数より高い周波数を低減させるような周波数特性〈
所謂ローパス）を出力信号に対してもたせれば、妨害信
号が周波数変換回路によって周波数変換された妨害中間
周波信号、即ち、妨害信号と局部発振信号との差の周波
数の信号は減衰されるので、この妨害中間周波信号が次
段に接続される回路に入力され本来の中間周波信号を抑
圧する度合いを低減することができ、結局、妨害信号に
よる受信感度の悪化を低減させることができる。First, if the difference in frequency between the interference signal input to the received signal input terminal 4 and the local oscillation signal is higher than the frequency of the original intermediate frequency signal, the frequency higher than the frequency of the original intermediate frequency signal is reduced by the frequency conversion circuit. Frequency characteristics that make
If a so-called low-pass) is applied to the output signal, the interfering intermediate frequency signal obtained by converting the frequency of the interfering signal by the frequency conversion circuit, that is, the signal having the difference in frequency between the interfering signal and the local oscillation signal, will be attenuated. This interfering intermediate frequency signal is input to a circuit connected to the next stage, and the degree to which the original intermediate frequency signal is suppressed can be reduced, and as a result, deterioration in reception sensitivity due to the interfering signal can be reduced.
また、受信信号入力端子４に人力された妨害信号と局部
発振信号との周波数の差が本来の中間周波信号の周波数
より低い場合、周波数変換回路に本来の中間周波信号の
周波数より低い周波数を低減させるような周波数特性（
所謂バイパス）を出力信号に対してもたせれば、妨害信
号が周波数変換回路によって周波数変換された妨害中間
周波信号、即ち、妨害信号と局部発振信号との差の周波
数の信号は減衰されるので、この妨害中間周波信号が次
段に接続される回路に入力され本来の中間周波信号を抑
圧する度合いを低減することができ、結局、妨害信号に
よる受信感度の悪化を低減させることができる。In addition, if the difference in frequency between the interference signal input to the received signal input terminal 4 and the local oscillation signal is lower than the frequency of the original intermediate frequency signal, the frequency lower than the frequency of the original intermediate frequency signal is reduced in the frequency conversion circuit. Frequency characteristics (
If a so-called bypass is provided for the output signal, the interfering intermediate frequency signal whose frequency has been converted by the interfering signal by the frequency conversion circuit, that is, the signal having the difference in frequency between the interfering signal and the local oscillation signal, will be attenuated. This interfering intermediate frequency signal is input to a circuit connected to the next stage, and the degree to which the original intermediate frequency signal is suppressed can be reduced, and as a result, deterioration in reception sensitivity due to the interfering signal can be reduced.
以上のように本実施例によれば、周波数変換回路に周波
数特性をもたせることにより、受信信号入力端子に入力
される妨害信号によって生じる妨害中間周波信号を減衰
させることができるので、この妨害中間周波信号が次に
接続される回路に入力され本来の中間周波信号を抑圧す
る度合いを低減することができ、結局、妨害信号による
受信感度の悪化を低減させることができる。As described above, according to this embodiment, by providing the frequency conversion circuit with frequency characteristics, it is possible to attenuate the interfering intermediate frequency signal generated by the interfering signal input to the received signal input terminal. The degree to which the signal is input to the next connected circuit and suppresses the original intermediate frequency signal can be reduced, and as a result, deterioration in receiving sensitivity due to interference signals can be reduced.
発明の効果
以上のように本発明によれば、周波数変換回路の出力信
号に周波数特性をもたせることにより、周波数変換回路
に希望信号の周波数以外の周波数の妨害信号が入力され
たときに、受信感度が悪化する度合いを低減させること
ができる優れた周波数変換回路を実現できる。Effects of the Invention As described above, according to the present invention, by giving the output signal of the frequency conversion circuit a frequency characteristic, when an interference signal having a frequency other than the frequency of the desired signal is input to the frequency conversion circuit, the receiving sensitivity can be improved. It is possible to realize an excellent frequency conversion circuit that can reduce the degree of deterioration of the frequency.
第１図は本発明の一実施例における周波数変換回路の構
成図、第２図は従来の周波数変換回路の構成図である。
１・・・・・・局部発振回路、２・・・・・・局部発振
信号入力端子、３・・・・・・出力信号に周波数特性を
もたせた周波数変換回路、４・・・・・・受信信号入力
端子、５・・・・・・出力端子。FIG. 1 is a block diagram of a frequency conversion circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional frequency conversion circuit. 1...Local oscillation circuit, 2...Local oscillation signal input terminal, 3...Frequency conversion circuit that gives the output signal frequency characteristics, 4... Received signal input terminal, 5... Output terminal.
Claims (1)
子と、その出力信号に周波数特性をもたせる機能とを備
えた周波数変換回路。A frequency conversion circuit that includes a local oscillation signal input terminal, a received signal input terminal, an output terminal, and a function to impart frequency characteristics to the output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1140445A JPH036108A (en) | 1989-06-01 | 1989-06-01 | Frequency conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1140445A JPH036108A (en) | 1989-06-01 | 1989-06-01 | Frequency conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH036108A true JPH036108A (en) | 1991-01-11 |
Family
ID=15268797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1140445A Pending JPH036108A (en) | 1989-06-01 | 1989-06-01 | Frequency conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH036108A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016003958A1 (en) | 2015-04-03 | 2016-10-06 | Hirata Corporation | Processing method, manufacturing method and positioning device |
-
1989
- 1989-06-01 JP JP1140445A patent/JPH036108A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016003958A1 (en) | 2015-04-03 | 2016-10-06 | Hirata Corporation | Processing method, manufacturing method and positioning device |
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