JPH0288321U

JPH0288321U -

Info

Publication number: JPH0288321U
Application number: JP16874088U
Authority: JP
Priority date: 1988-12-27
Filing date: 1988-12-27
Publication date: 1990-07-12

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例の構成を示す接続
図、第２図はこの考案の他の実施例の構成を示す
接続図、第３図は従来のＴ型可変減衰器の構成を
示す接続図、第４図は動作説明のための等価回路
図である。図において、１は第１のＦＥＴ、２は第２のＦ
ＥＴ、３は第３のＦＥＴ、４は第１の抵抗、５は
第２の抵抗、６は第３の抵抗、７はグランドであ
る。なお、図中同一符号は同一または相当部分を
示す。 Fig. 1 is a connection diagram showing the structure of one embodiment of this invention, Fig. 2 is a connection diagram showing the structure of another embodiment of this invention, and Fig. 3 shows the structure of a conventional T-type variable attenuator. The connection diagram and FIG. 4 are equivalent circuit diagrams for explaining the operation. In the figure, 1 is the first FET, and 2 is the second FET.
ET, 3 is a third FET, 4 is a first resistor, 5 is a second resistor, 6 is a third resistor, and 7 is a ground. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

It consists of a first resistor whose one end is grounded and whose other end is connected to one end of a second resistor and one end of a third resistor, and the other end of the second resistor is connected to an input terminal (or an output terminal). ), the other end of the third resistor is the output terminal (or input terminal) of a T-type fixed attenuator, the drain electrode is connected to the input terminal of the T-type fixed attenuator, and the source electrode is connected to the T-type fixed attenuator.
A variable attenuator comprising a field effect transistor connected to an output terminal of a fixed type attenuator.