JPS63140708U - - Google Patents
Info
- Publication number
- JPS63140708U JPS63140708U JP3239587U JP3239587U JPS63140708U JP S63140708 U JPS63140708 U JP S63140708U JP 3239587 U JP3239587 U JP 3239587U JP 3239587 U JP3239587 U JP 3239587U JP S63140708 U JPS63140708 U JP S63140708U
- Authority
- JP
- Japan
- Prior art keywords
- diagram
- detection circuit
- circuit
- detection
- output end
- 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
- 238000001514 detection method Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
第１図は本考案の一実施例の回路図、第２図は
ＪＦＥＴのドレイン・ソース間の電圧電流特性の
図、第３図は平均値検波回路の原理図、第４図は
包絡線検波回路の原理図、第５図は包絡線検波と
平均値検波の効率曲線図、第６図は本考案の他の
実施例の回路の説明図で、イ図はその回路図、ロ
図、ハ図は検波の状況を示す図、第７図はバイポ
ーラ対数増幅器の特性曲線図である。
１……高周波トランス、２Ａ，２Ｂ，１０……
ダイオード、３……ＪＦＥＴ、４，１１……抵抗
、５，１２……コンデンサ、６……時定数回路、
７……低域フイルタ。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a diagram of voltage-current characteristics between the drain and source of a JFET, Fig. 3 is a principle diagram of an average value detection circuit, and Fig. 4 is an envelope detection circuit. Figure 5 is a diagram of the principle of the circuit, Figure 5 is an efficiency curve diagram of envelope detection and average value detection, Figure 6 is an explanatory diagram of a circuit of another embodiment of the present invention, Figure A is the circuit diagram, Figure 5 is the circuit diagram, The figure shows the detection situation, and FIG. 7 is a characteristic curve diagram of the bipolar logarithmic amplifier. 1...High frequency transformer, 2A, 2B, 10...
Diode, 3... JFET, 4, 11... Resistor, 5, 12... Capacitor, 6... Time constant circuit,
7...Low frequency filter.
Claims (1)
数圧縮増幅したのち検波する検波回路において、
検波手段の出力端に接続した定電流回路と、平滑
用コンデンサとを具備したことを特徴とする検波
回路。 In a detection circuit that logarithmically compresses and amplifies received echo signals with a wide dynamic range,
A detection circuit characterized by comprising a constant current circuit connected to an output end of a detection means and a smoothing capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3239587U JPS63140708U (en) | 1987-03-05 | 1987-03-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3239587U JPS63140708U (en) | 1987-03-05 | 1987-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63140708U true JPS63140708U (en) | 1988-09-16 |
Family
ID=30839031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3239587U Pending JPS63140708U (en) | 1987-03-05 | 1987-03-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63140708U (en) |
-
1987
- 1987-03-05 JP JP3239587U patent/JPS63140708U/ja active Pending