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US 9,306,505 B2Granted
Low-noise amplifier circuit
AssigneeST-Ericsson SA
InventorFrederic Rivoirard
Life of this patent
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Abstract
A low-noise amplifier (LNA) circuit utilizes the capacitive cross coupling technique with two pairs of NMOS transistors in conjunction with two cross coupled PMOS transistors to obtain a reduced noise figure. By using the cross coupling technique on the PMOS input transistor, the LNA circuit is able to reduce the noise figure below 2 dB without the use of an inductor. This LNA circuit may be used to amplify a signal in the WLAN band or the Bluetooth band, either independently or simultaneously.
Claims14
A low-noise amplifier circuit comprising:
- a first transistor NMOS, a second transistor NMOS, a third transistor NMOS and a fourth transistor NMOS, each transistor having a source terminal, a gate terminal and a drain terminal,
- the source terminal of the second transistor being coupled to the drain terminal of the first transistor,
- the source terminal of the third transistor being coupled to the drain terminal of the fourth transistor,
- the gate terminal of the first transistor having a first capacitive coupling to the source terminal of the fourth transistor, and
- the gate terminal of the fourth transistor having a second capacitive coupling to the source terminal of the first transistor;
- a fifth transistor PMOS and a sixth transistor PMOS, each transistor having a source terminal, a gate terminal and a drain terminal,
- the drain terminal of the fifth transistor being coupled to the drain terminal of the second transistor,
- the drain terminal of the sixth transistor being coupled to the drain terminal of the third transistor,
- the source terminal of the fifth transistor having a third capacitive coupling to the source terminal of the first transistor,
- the gate terminal of the fifth transistor having a fourth capacitive coupling to the source terminal of the sixth transistor or to the source terminal of the fourth transistor,
- the gate terminal of the sixth transistor having a fifth capacitive coupling to the source terminal of the fifth transistor or to the source terminal of the first transistor, and
- the source terminal of the sixth transistor having a sixth capacitive coupling to the source terminal of the fourth transistor.
9 more elements
A circuit comprising:
- a low-noise amplifier circuit including
- a first transistor NMOS, a second transistor NMOS, a third transistor NMOS and a fourth transistor NMOS, each transistor having a source terminal, a gate terminal and a drain terminal, the source terminal of the second transistor being coupled to the drain terminal of the first transistor, the source terminal of the third transistor being coupled to the drain terminal of the fourth transistor, the gate terminal of the first transistor having a first capacitive coupling to the source terminal of the fourth transistor, and the gate terminal of the fourth transistor having a second capacitive coupling to the source terminal of the first transistor;
- a fifth transistor PMOS and a sixth transistor PMOS, each transistor having a source terminal, a gate terminal and a drain terminal, the drain terminal of the fifth transistor being coupled to the drain terminal of the second transistor, the drain terminal of the sixth transistor being coupled to the drain terminal of the third transistor, the source terminal of the fifth transistor having a third capacitive coupling to the source terminal of the first transistor, the gate terminal of the fifth transistor having a fourth capacitive coupling to the source terminal of the sixth transistor or to the source terminal of the fourth transistor, the gate terminal of the sixth transistor having a fifth capacitive coupling to the source terminal of the fifth transistor or to the source terminal of the first transistor, and the source terminal of the sixth transistor having a sixth capacitive coupling to the source terminal of the fourth transistor;
- and
- a power amplifier,
- wherein the low-noise amplifier circuit input is shared with the power amplifier across a Balun.
3 more elements
A mobile device comprising:
- a low-noise amplifier circuit including
- a first transistor NMOS, a second transistor NMOS, a third transistor NMOS and a fourth transistor NMOS, each transistor having a source terminal, a gate terminal and a drain terminal, the source terminal of the second transistor being coupled to the drain terminal of the first transistor, the source terminal of the third transistor being coupled to the drain terminal of the fourth transistor, the gate terminal of the first transistor having a first capacitive coupling to the source terminal of the fourth transistor, and the gate terminal of the fourth transistor having a second capacitive coupling to the source terminal of the first transistor;
- a fifth transistor PMOS and a sixth transistor PMOS, each transistor having a source terminal, a gate terminal and a drain terminal, the drain terminal of the fifth transistor being coupled to the drain terminal of the second transistor, the drain terminal of the sixth transistor being coupled to the drain terminal of the third transistor, the source terminal of the fifth transistor having a third capacitive coupling to the source terminal of the first transistor, the gate terminal of the fifth transistor having a fourth capacitive coupling to the source terminal of the sixth transistor or to the source terminal of the fourth transistor, the gate terminal of the sixth transistor having a fifth capacitive coupling to the source terminal of the fifth transistor or to the source terminal of the first transistor, and the source terminal of the sixth transistor having a sixth capacitive coupling to the source terminal of the fourth transistor.
Dependencies are inferred from the claim text.