JPH01179620U - - Google Patents
Info
- Publication number
- JPH01179620U JPH01179620U JP7621888U JP7621888U JPH01179620U JP H01179620 U JPH01179620 U JP H01179620U JP 7621888 U JP7621888 U JP 7621888U JP 7621888 U JP7621888 U JP 7621888U JP H01179620 U JPH01179620 U JP H01179620U
- Authority
- JP
- Japan
- Prior art keywords
- variable gain
- gain amplifier
- amplifier circuit
- constant current
- differential pair
- 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
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第1図は本考案の一実施例を説明するための可
変利得増幅回路図、第2図は従来の一例を説明す
るための可変利得増幅回路図である。
11……差動対トランジスタ回路(差動対回路
)、IN11,IN12……入力端子、INc1
〜INcn……制御端子、Q11,Q12,Qs
1〜Ssn……バイポーラトランジスタ、M1〜
Mn,Ms……MOSトランジスタ、R11,R
12……抵抗、11,12……出力端子、V
cc……電源、GND……接地端子、Ic1……
定電流源、IQ……動作電流。
FIG. 1 is a variable gain amplifier circuit diagram for explaining an embodiment of the present invention, and FIG. 2 is a variable gain amplifier circuit diagram for explaining a conventional example. 11... Differential pair transistor circuit (differential pair circuit), IN 11 , IN 12 ... Input terminal, IN c1
~IN cn ...Control terminal, Q11 , Q12 , Qs
1 ~S sn ...Bipolar transistor, M1 ~
M n , M s ...MOS transistor, R 11 , R
12 ...Resistance, 11 , 12 ...Output terminal, V
cc ...Power supply, GND...Grounding terminal, I c1 ...
Constant current source, IQ... operating current.
Claims (1)
の共通接続点にオン・オフ可能な定電流源の出力
端子を複数個接続したことを特徴とする可変利得
増幅回路。 A variable gain amplifier circuit characterized in that a plurality of output terminals of constant current sources that can be turned on and off are connected to a common connection point of the emitters of differential pair transistors that perform differential amplification.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7621888U JPH01179620U (en) | 1988-06-07 | 1988-06-07 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7621888U JPH01179620U (en) | 1988-06-07 | 1988-06-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01179620U true JPH01179620U (en) | 1989-12-22 |
Family
ID=31301259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7621888U Pending JPH01179620U (en) | 1988-06-07 | 1988-06-07 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01179620U (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS566513A (en) * | 1979-06-29 | 1981-01-23 | Matsushita Electric Ind Co Ltd | Signal level control circuit |
JPS56110314A (en) * | 1980-01-21 | 1981-09-01 | Tektronix Inc | Variable gain amplifier |
-
1988
- 1988-06-07 JP JP7621888U patent/JPH01179620U/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS566513A (en) * | 1979-06-29 | 1981-01-23 | Matsushita Electric Ind Co Ltd | Signal level control circuit |
JPS56110314A (en) * | 1980-01-21 | 1981-09-01 | Tektronix Inc | Variable gain amplifier |
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