JPH045738U - - Google Patents
Info
- Publication number
- JPH045738U JPH045738U JP4573690U JP4573690U JPH045738U JP H045738 U JPH045738 U JP H045738U JP 4573690 U JP4573690 U JP 4573690U JP 4573690 U JP4573690 U JP 4573690U JP H045738 U JPH045738 U JP H045738U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- shifting
- signal output
- shifting means
- distribution
- 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
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000003786 synthesis reaction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
第１図は本考案の一実施例であるＱＰＳＫ変調
器の一例を示すブロツク図、第２図は従来のＱＰ
ＳＫ変調器のブロツク図である。
１……π／２ハイブリツド回路、２，３……ダ
ブル・バランスド・ミキサー（ＤＢＭ）、４……
同相ハイブリツド回路、５……減衰器。
Figure 1 is a block diagram showing an example of a QPSK modulator, which is an embodiment of the present invention, and Figure 2 is a block diagram of a conventional QPSK modulator.
FIG. 2 is a block diagram of an SK modulator. 1...π/2 hybrid circuit, 2, 3...Double balanced mixer (DBM), 4...
In-phase hybrid circuit, 5...attenuator.
Claims (1)
手段と、 上記分配手段から出力される第１の信号の位相
をπ／２だけ偏移させる移相手段と、 第１の制御信号に応答して上記分配手段から出
力される第２の信号の位相を０又はπのいずれか
だけ偏移させる第１の偏移手段と、 第２の制御信号に応答して上記位相手段から出
力される信号の位相を０又はπのいずれかだけ偏
移させる第２の偏移手段と、 上記第１と第２の偏移手段から出力される各信
号を合成する合成手段とを備えた４相位相変調器
において、 上記合成手段に入力される各信号のレベルが同
一となるように、所定の減衰量を有する減衰手段
を、上記第１の偏移手段と上記合成手段との間、
上記第２の偏移手段と上記合成手段との間、上記
分配手段と上記第１の偏移手段との間、又は上記
移相手段と上記第２の偏移手段との間のいずれか
に挿入したことを特徴とする４相位相変調器。[Claims for Utility Model Registration] Distribution means for dividing an input signal into first and second signals; and phase shifting means for shifting the phase of the first signal output from the distribution means by π/2. and a first shifting means for shifting the phase of the second signal output from the distribution means by either 0 or π in response to the first control signal; and a first shifting means responsive to the second control signal. and a second shifting means for shifting the phase of the signal output from the phase means by either 0 or π, and combining each signal output from the first and second shifting means. In the four-phase phase modulator, the attenuation means having a predetermined amount of attenuation is connected to the first shift means and the above-mentioned first shift means so that the levels of the respective signals input to the synthesis means are the same. between the synthesis means,
either between the second shifting means and the combining means, between the distributing means and the first shifting means, or between the phase shifting means and the second shifting means. A four-phase phase modulator characterized in that a four-phase phase modulator is inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4573690U JPH045738U (en) | 1990-04-27 | 1990-04-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4573690U JPH045738U (en) | 1990-04-27 | 1990-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH045738U true JPH045738U (en) | 1992-01-20 |
Family
ID=31560177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4573690U Pending JPH045738U (en) | 1990-04-27 | 1990-04-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH045738U (en) |
-
1990
- 1990-04-27 JP JP4573690U patent/JPH045738U/ja active Pending
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