JPS6150342U

JPS6150342U -

Info

Publication number: JPS6150342U
Application number: JP13868985U
Authority: JP
Priority date: 1985-09-12
Filing date: 1985-09-12
Publication date: 1986-04-04

Description

[Brief explanation of drawings]

第１図は直流電流が流れているダイオード直流
電流と微小信号に於ける交流インピーダンスとの
関係を示す図、第２図は可変減衰回路の従来例、
第３図は本考案の一実施例である。Ｔ１，Ｔ１−１，Ｔ１−２，Ｔ２，Ｔ３…変成
器、Ｒ１，Ｒ２，Ｒ３，Ｒ４…抵抗、Ｄ１，Ｄ２
，Ｄ３，Ｄ４…ダイオード、Ｖ，Ｖ１，Ｖ２…直
流電源、ＳＷ…スイツチング回路、Ｃ１，Ｃ２…
コンデンサ。 Figure 1 is a diagram showing the relationship between the DC current and AC impedance of a minute signal in a diode through which DC current flows, and Figure 2 is a conventional example of a variable attenuation circuit.
FIG. 3 shows an embodiment of the present invention. T1, T1-1, T1-2, T2, T3...Transformer, R1, R2, R3, R4...Resistor, D1, D2
, D3, D4...Diode, V, V1, V2...DC power supply, SW...Switching circuit, C1, C2...
capacitor.

Claims

[Scope of utility model registration request]

first and second transformers T1-1 and T1-2 having a primary winding into which a signal is input (or output) and a secondary winding having intermediate taps 14 and 14';
a third transformer T3 having first and second primary windings having intermediate taps 17 and 20, respectively, and a secondary winding to which a signal is output (or input); Both ends 13,15 of the secondary winding of T1-1 and both ends 16,1 of the first primary winding of the third transformer T3.
and diodes D1 and D2 inserted with the same polarity between the two terminals 13' and 15' of the secondary winding of the second transformer T1-2 and the second terminal of the third transformer T3. The diodes D1 and D2 are inserted between the ends 19 and 21 of the primary winding, the diodes D3 and D4 are inserted with opposite polarities, and one end is connected to the first transformer T.
A resistor R3 is connected to the intermediate tap 14 of the second transformer T1-1, and one end is connected to the intermediate tap 14 of the second transformer T1-2.
DC power supply V1, which is provided between the point connecting the other ends of the resistor R4 connected to ' and the intermediate taps 17, 20 of the first and second primary windings of the third transformer T3. V2, and a switching circuit SW that switches the polarity of the DC power supply, and switches the polarity of the DC power supply by each input signal applied to the first and second transformers (or the third transformer). A signal switching circuit characterized in that signals are alternately taken out from the third transformer (or the first or second transformer) according to