TW200743300A - Variable gain amplifier with gain adjusting circuit - Google Patents
Variable gain amplifier with gain adjusting circuitInfo
- Publication number
- TW200743300A TW200743300A TW095149586A TW95149586A TW200743300A TW 200743300 A TW200743300 A TW 200743300A TW 095149586 A TW095149586 A TW 095149586A TW 95149586 A TW95149586 A TW 95149586A TW 200743300 A TW200743300 A TW 200743300A
- Authority
- TW
- Taiwan
- Prior art keywords
- exponential
- circuit
- controlling signal
- linear
- signal
- Prior art date
Links
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
A variable gain amplifier is disclosed, wherein the variable gain amplifier includes a gain adjusting circuit and an amplifying circuit. The gain adjusting circuit includes a linear exponential transforming circuit, a voltage buffer circuit and a power transforming circuit. The linear exponential transforming circuit receives a linear controlling signal and transforms the linear controlling signal to output an exponential controlling signal. The voltage buffer circuit is electrically connected with the linear exponential transforming circuit to receive the exponential controlling signal and generates a voltage controlling signal and a feedback signal according to the exponential controlling signal and a bias current. The voltage controlling signal controls the amplifying circuit. The power transforming circuit is electrically connected with the linear exponential transforming circuit and the voltage buffer circuit to receive the exponential controlling signal and the feedback signal and take the two times of square root of product of the exponential controlling signal and the feedback signal and then plus the bias current to output a power signal to the linear exponential transforming circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US79932406P | 2006-05-11 | 2006-05-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200743300A true TW200743300A (en) | 2007-11-16 |
TWI328343B TWI328343B (en) | 2010-08-01 |
Family
ID=38697682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW95149586A TWI328343B (en) | 2006-05-11 | 2006-12-28 | Variable gain amplifier with gain adjusting circuit |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN100578926C (en) |
TW (1) | TWI328343B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6085910B2 (en) | 2012-06-29 | 2017-03-01 | オムロン株式会社 | Photoelectric sensor and method for controlling amplification of received light amount in photoelectric sensor |
CN105720938B (en) * | 2016-01-22 | 2018-01-05 | 西安电子科技大学 | A kind of linear ultra wide band variable gain amplifiers of dB |
CN109150112A (en) * | 2018-08-01 | 2019-01-04 | 电子科技大学 | Ultra wide band variable gain mixer |
-
2006
- 2006-12-28 TW TW95149586A patent/TWI328343B/en active
- 2006-12-30 CN CN200610172338A patent/CN100578926C/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN100578926C (en) | 2010-01-06 |
TWI328343B (en) | 2010-08-01 |
CN101009479A (en) | 2007-08-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2008112041A3 (en) | Power supply providing ultrafast modulation of output voltage | |
WO2007123792A3 (en) | Switching power amplifier | |
WO2008008176A3 (en) | Polar transmitter having a dynamically controlled voltage regulator and method for operating same | |
TW200601692A (en) | Amplifying circuit with variable supply voltage | |
GB2451527B (en) | Amplifier circuit | |
MY156892A (en) | Transimpedance amplifier with distributed control of feedback line | |
TW200614643A (en) | Power supply controller and method | |
WO2007092195A3 (en) | Power amplifier controller circuit | |
EP2387150A3 (en) | Automatic bias control circuit for linear power amplifiers | |
GB2589794A (en) | Gain control in a class-D open-loop amplifier | |
WO2008088025A1 (en) | Amplification circuit and radio communication device | |
TW200609700A (en) | Low-gain current mode voltage regulator and control method thereof | |
ATE525801T1 (en) | CIRCUIT COMPRISING A POWER AMPLIFIER AND AMPLIFICATION METHOD | |
WO2010115158A3 (en) | Variable gain instrumentation amplifier | |
WO2006020521A3 (en) | Quiescent current control circuit for power amplifiers | |
ATE515105T1 (en) | POWER AMPLIFIER | |
TW200740106A (en) | Low noise amplifier and low noise amplifying method of dynamically adjusting a bias voltage when switching gain modes to improve linearity | |
HK1080308A1 (en) | Gain compensation over temperature and frequency variations in wireless transceivers | |
TW200644406A (en) | Operational amplifier circuit having adjustable bias current | |
TW200627791A (en) | Power amplifier circuit and method thereof | |
TWI268657B (en) | Variable gain amplifier | |
TW200743300A (en) | Variable gain amplifier with gain adjusting circuit | |
WO2009065621A3 (en) | Amplitude modulation controller for polar transmitter using coarse and fine power control | |
TW200740111A (en) | Low distortion class-D amplifier and audio system thereof | |
AU2002308163A1 (en) | R.f. output power control |