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US 9,806,686 B1Granted
Linear variable gain amplifier
AssigneeInphi Corporation
InventorGuojun Ren
Life of this patent
Estimating the term…
Abstract
The present invention is directed to electrical circuits and techniques thereof. More specifically, an embodiment of the present invention provides a variable gain amplifier that includes a first transistor and a second transistor whose gate terminals are coupled to a first input terminal. A first drain terminal of the first transistor and a first source terminal of the second transistor is coupled to a voltage gain control switch. There are other embodiments as well.
Claims20
A variable gain amplifier (VGA) device comprising:
- a first input terminal and a second input terminal;
- a first NMOS switch comprising a first source terminal, a first drain terminal, and a first gate terminal, the first gate terminal being coupled to the first input terminal;
- a second NMOS switch comprising a second source terminal, a second drain terminal, and a second gate terminal, the second drain terminal being coupled to the first source terminal, the second source terminal being coupled to a ground terminal, the second gate terminal being coupled to the first input terminal;
- a third NMOS switch comprising a third drain terminal, a third source terminal, and a third gate terminal, the third gate terminal being coupled to the second input terminal;
- a fourth NMOS switch comprising a fourth drain terminal, a fourth source terminal, and a fourth gate terminal, the fourth gate terminal being coupled to the second input terminal, the fourth source terminal being coupled to the ground terminal;
- and
- a voltage control module comprising a control terminal, the voltage control module being coupled to the first source terminal and the second drain terminal.
4 more elements
A variable gain amplifier (VGA) device comprising:
- a first input terminal and a second input terminal;
- a first NMOS switch comprising a first source terminal, a first drain terminal, and a first gate terminal, the first gate terminal being coupled to the first input terminal;
- a second NMOS switch comprising a second source terminal, a second drain terminal, and a second gate terminal, the second drain terminal being coupled to the first source terminal, the second source terminal being coupled to a ground terminal, the second gate terminal being coupled to the first input terminal;
- a third NMOS switch comprising a third drain terminal, a third source terminal, and a third gate terminal, the third gate terminal being coupled to the second input terminal;
- a fourth NMOS switch comprising a fourth drain terminal, a fourth source terminal, and a fourth gate terminal, the fourth gate terminal being coupled to the second input terminal, the fourth source terminal being coupled to the ground terminal;
- and
- a fifth NMOS switch comprising a fifth drain terminal, a fifth source terminal, and a fifth gate terminal, the fifth gate terminal being coupled to a voltage control terminal, the fifth source terminal being coupled to the first source terminal and the second drain terminal, the fifth drain terminal being coupled to the third source terminal and the second drain terminal.
4 more elements
A variable gain amplifier (VGA) device comprising:
- a first input terminal and a second input terminal;
- a first load resistor and a second load resistor;
- a first PMOS switch comprising a first source terminal, a first drain terminal, and a first gate terminal, the first gate terminal being coupled to the first input terminal;
- a second PMOS switch comprising a second source terminal, a second drain terminal, and a second gate terminal, the second source terminal being coupled to the first drain terminal, the second drain terminal being coupled to the first load resistor, the second gate terminal being coupled to the first input terminal;
- a third PMOS switch comprising a third drain terminal, a third source terminal, and a third gate terminal, the third gate terminal being coupled to the second input terminal;
- a fourth PMOS switch comprising a fourth drain terminal, a fourth source terminal, and a fourth gate terminal, the fourth gate terminal being coupled to the second input terminal, the fourth drain terminal being coupled to the second load resistor;
- and
- a voltage control module comprising a control terminal, the voltage control module being coupled to the first drain terminal and the second source terminal.
5 more elements
Dependencies are inferred from the claim text.