JPS6461109A - Variable gain amplifier circuit - Google Patents
Variable gain amplifier circuitInfo
- Publication number
- JPS6461109A JPS6461109A JP21758587A JP21758587A JPS6461109A JP S6461109 A JPS6461109 A JP S6461109A JP 21758587 A JP21758587 A JP 21758587A JP 21758587 A JP21758587 A JP 21758587A JP S6461109 A JPS6461109 A JP S6461109A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- switches
- sets
- resistors
- amplifier circuit
- 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
Landscapes
- Analogue/Digital Conversion (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To improve the linearity and accuracy of gain control by using a resistor string comprising 2<n> sets of unit resistors so as to divide an output of an operational amplifier, feeding back the result to its inverting input and controlling the feedback quantity by an n-bit digital input data. CONSTITUTION:Among an output terminal of an operational amplifier 2, each connection midpoint of 2<n> sets of resistors 51-5L and an inverting input of the operational amplifier 2, 2<n> sets of switches 61-6L are connected respectively. A control signal is supplied to the switches 61-6L respectively from output terminals 71-7L of a decoder 7 receiving an n-bit digital input data and any of the switches, such as the switch 63, is closed selectively. Since the resistance of the resistors 51-5L of the resistor string is equal to each other, an excellent linearity is obtained for the operational amplifier 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21758587A JPS6461109A (en) | 1987-08-31 | 1987-08-31 | Variable gain amplifier circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21758587A JPS6461109A (en) | 1987-08-31 | 1987-08-31 | Variable gain amplifier circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6461109A true JPS6461109A (en) | 1989-03-08 |
Family
ID=16706590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21758587A Pending JPS6461109A (en) | 1987-08-31 | 1987-08-31 | Variable gain amplifier circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6461109A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05327376A (en) * | 1992-05-20 | 1993-12-10 | Fujitsu Ltd | Digital control variable gain circuit |
JP2002271155A (en) * | 2001-03-13 | 2002-09-20 | Sony Corp | Audio amplifier |
KR101102975B1 (en) * | 2004-12-30 | 2012-01-05 | 매그나칩 반도체 유한회사 | Digital controlled variable gain amplifier |
JP2012147219A (en) * | 2011-01-12 | 2012-08-02 | Ricoh Co Ltd | Volume control circuit |
JP2016082504A (en) * | 2014-10-21 | 2016-05-16 | ローム株式会社 | Variable gain amplifier circuit |
-
1987
- 1987-08-31 JP JP21758587A patent/JPS6461109A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05327376A (en) * | 1992-05-20 | 1993-12-10 | Fujitsu Ltd | Digital control variable gain circuit |
JP2002271155A (en) * | 2001-03-13 | 2002-09-20 | Sony Corp | Audio amplifier |
KR101102975B1 (en) * | 2004-12-30 | 2012-01-05 | 매그나칩 반도체 유한회사 | Digital controlled variable gain amplifier |
JP2012147219A (en) * | 2011-01-12 | 2012-08-02 | Ricoh Co Ltd | Volume control circuit |
JP2016082504A (en) * | 2014-10-21 | 2016-05-16 | ローム株式会社 | Variable gain amplifier circuit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5525209A (en) | Gain control circuit | |
US5633637A (en) | Digital-to-analog converter circuit | |
JPS6461109A (en) | Variable gain amplifier circuit | |
JPS62173809A (en) | Amplifier | |
JPS5513583A (en) | Analogue-digital converter circuit | |
JPS5472660A (en) | Analog digital converter | |
JPS5628524A (en) | Switch unit for analogue signal | |
SU1385258A1 (en) | Amplifying device | |
JPS6449410A (en) | Gain variable circuit | |
JPS5776918A (en) | A/d converter | |
JPS6454936A (en) | Binary/ternary value converting circuit | |
JPS55123233A (en) | Switch unit | |
JPH0450646Y2 (en) | ||
JPS645118A (en) | Successive comparison type a/d converter | |
SU560238A1 (en) | Tangent code to analog converter | |
ATE90817T1 (en) | SENSOR SWITCH ARRANGEMENT. | |
JPS55165026A (en) | Digital-analog converter | |
JPH0425732B2 (en) | ||
JPS57183113A (en) | Resistance network | |
JPS57159107A (en) | Range changeover amplifier | |
JPS5758481A (en) | Dropout compensation circuit | |
JPS6469107A (en) | Inverting circuit | |
JPS57125506A (en) | Operational amplifying circuit | |
JPH02206908A (en) | Operational amplifier circuit | |
JPH01177210A (en) | Digital input-controlled electronic volume circuit |