Amplifying circuit and associated receiver
AssigneeRealtek Semiconductor Corp.
InventorsChia-Jun Chang, Ka-Un Chan
Life of this patent
Estimating the term…
Abstract
An amplifying circuit includes a first gain adjusting circuit, a second gain adjusting circuit, a load circuit and a switch module. When the amplifying circuit operates in a first mode, the first gain adjusting circuit receives a first input signal, and generates a first output signal to a second output terminal of the amplifying circuit via the load circuit and the switch module; and when the amplifying circuit operates in a second mode, the second gain adjusting circuit receives a second input signal, and generates a second output signal to a first output terminal of the amplifying circuit via the load circuit and the switch module.
Claims10
An amplifying circuit, comprising:
- a first output terminal and a second output terminal;
- a first gain adjusting circuit;
- a second gain adjusting circuit;
- a loading circuit;
- and
- a switching circuit, coupled to the first gain adjusting circuit, the second gain adjusting circuit, the loading circuit, the first output terminal and the second output terminal of the amplifying circuit;
- wherein when the amplifying circuit operates in a first operating mode, the first gain adjusting circuit receives a first input signal, and transmits a first output signal to the second output terminal of the amplifying circuit via the switching circuit and the loading circuit, and the first output signal is not transmitted to the first output terminal at this point;
- and when the amplifying circuit operates in a second operating mode, the second gain adjusting circuit receives a second input signal, and transmits a second output signal to the first output terminal via the switching circuit and the loading circuit, and the second output signal is not transmitted to the second output terminal at this point.
A receiver, comprising:
- a matching circuit;
- a low noise amplifier, coupled to the matching circuit, comprising:
- a first output terminal and a second output terminal;
- a first gain adjusting circuit;
- a second gain adjusting circuit;
- a loading circuit;
- and
- a switching circuit, coupled to the first gain adjusting circuit, the second gain adjusting circuit, the loading circuit, the first output terminal and the second output terminal of the low noise amplifier;
- wherein when the low noise amplifier operates in a first operating mode, the first gain adjusting circuit receives a first input signal from an antenna via the matching circuit, and transmits a first output signal to the second output terminal of the low noise amplifier via the switching circuit and the loading circuit, and the first output signal is not transmitted to the first output terminal;
- and when the low noise amplifier operates in a second operating mode, the second gain adjusting circuit receives a second input signal from the antenna via the matching circuit, and transmits a second output signal to the first output terminal of the low noise amplifier via the switching circuit and the loading circuit, and the second output signal is not transmitted to the second output terminal;
- and
- a transformer wherein one of two terminals of a side coil of the transformer connects to the first output terminal of the low noise amplifier, and the other of the two terminals connects to the second output terminal of the low noise amplifier.
Dependencies are inferred from the claim text.