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US 9,503,052 B1Granted
Frequency selective circuit
AssigneeMediatek Inc.
InventorsYuan-Hung Chung, Ming-Yeh Hsu
Life of this patent
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Abstract
A frequency selective circuit includes a first transistor, an impedance element, a first capacitive element, a second capacitive element, a second capacitive and a second transistor. The first transistor includes a first terminal, a second terminal and a control terminal. The impedance element is coupled between the first terminal and the control terminal of the first transistor. The first capacitive element is coupled to the first terminal of the first transistor. The second capacitive element is coupled to the control terminal of the first transistor. The second transistor includes a first terminal, a second terminal and a control terminal, wherein the control terminal of the second transistor is coupled to the control terminal of the first transistor.
Claims14
A frequency selective circuit, comprising:
- a first transistor comprising a first terminal, a second terminal and a control terminal;
- an impedance element coupled between the first terminal and the control terminal of the first transistor;
- a first capacitive element coupled to the first terminal of the first transistor;
- a second capacitive element coupled to the control terminal of the first transistor;
- and
- a second transistor comprising a first terminal, a second terminal and a control terminal, the control terminal of the second transistor being coupled to the control terminal of the first transistor;
- wherein the impedance element comprises a resistive element and an inductive element.
4 more elements
A frequency selective circuit, comprising:
- a first transistor comprising a first terminal, a second terminal and a control terminal;
- an impedance element coupled between the first terminal and the control terminal of the first transistor;
- a first capacitive element coupled to the first terminal of the first transistor;
- a second capacitive element coupled to the control terminal of the first transistor;
- and
- a second transistor comprising a first terminal, a second terminal and a control terminal, the control terminal of the second transistor being coupled to the control terminal of the first transistor;
- wherein the impedance element comprises a third transistor including a first terminal, a second terminal and a control terminal, the first terminal of the third transistor is coupled to the control terminal of the first transistor, the second terminal of the third transistor is coupled to the first terminal of the first transistor, and the control terminal is biased by a reference voltage;
- wherein the first terminal of the third transistor is coupled to the control terminal of the first transistor via a resistive element;
- wherein the impedance element further comprises an operational amplifier including a first input, a second input and an output, the first input is coupled to the reference voltage, the second input is coupled to the second terminal of the third transistor, and the output of the operational amplifier is coupled to the control terminal of the third transistor.
6 more elements
A frequency selective circuit, comprising:
- a first transistor comprising a first terminal, a second terminal and a control terminal;
- an impedance element coupled between the first terminal and the control terminal of the first transistor;
- a first capacitive element coupled to the first terminal of the first transistor;
- a second capacitive element coupled to the control terminal of the first transistor;
- and
- a second transistor comprising a first terminal, a second terminal and a control terminal, the control terminal of the second transistor being coupled to the control terminal of the first transistor;
- wherein the impedance element comprises:
- a first complementary transistor including a first terminal, a second terminal and a control terminal, wherein the first terminal of the first complementary transistor is coupled to the first terminal of the first transistor, the control terminal of the first complementary transistor is coupled to the control terminal of the first transistor, and the type of the first complementary transistor is complementary to that of the first transistor;
- and
- a resistive element coupled between the first terminal and the control terminal of the first complementary transistor.
7 more elements
A frequency selective circuit, comprising:
- a first transistor comprising a first terminal, a second terminal and a control terminal;
- an impedance element coupled between the first terminal and the control terminal of the first transistor;
- a first capacitive element coupled to the first terminal of the first transistor;
- a second capacitive element coupled to the control terminal of the first transistor;
- and
- a second transistor comprising a first terminal, a second terminal and a control terminal, the control terminal of the second transistor being coupled to the control terminal of the first transistor;
- wherein the first transistor, the impedance element and the second capacitive element form one branch of an input differential pair in an input stage of the frequency selective circuit, and the branch of the input differential pair is coupled to another branch of the input differential pair via the first capacitive element.
4 more elements
Dependencies are inferred from the claim text.