Method and apparatus of an input resistance of a passive mixer to broaden the input matching bandwidth of a common source/gate LNA
First Claim
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1. An apparatus, comprising:
- a first spiral inductor coupled to a source of a first transistor;
a second spiral inductor coupled to a drain of a second transistor;
a third inductor connecting the first transistor to the second transistor;
a first capacitance coupled in parallel to the third inductor forming a bandpass filter; and
a second capacitance coupled in parallel to the first spiral inductor forming a resonant circuit, wherein the resonant circuit oscillates at a center frequency.
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Abstract
A cascode amplifier circuit comprises a first spiral inductor coupled to a source of a first transistor; a second spiral inductor coupled to a drain of a second transistor; a third inductor connecting the first transistor to the second transistor; a first capacitor coupled in parallel to the third inductor forming a bandpass filter; and a second capacitor coupled in parallel to the second spiral inductor forming a resonant circuit, wherein the resonant circuit oscillates at a center frequency.
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13 Claims
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1. An apparatus, comprising:
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a first spiral inductor coupled to a source of a first transistor; a second spiral inductor coupled to a drain of a second transistor; a third inductor connecting the first transistor to the second transistor; a first capacitance coupled in parallel to the third inductor forming a bandpass filter; and a second capacitance coupled in parallel to the first spiral inductor forming a resonant circuit, wherein the resonant circuit oscillates at a center frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a circuit, comprising:
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coupling a first spiral inductor to a source of a first transistor; coupling a second spiral inductor to a drain of a second transistor; connecting a third inductor between the first transistor to the second transistor; forming a bandpass filter by coupling a first capacitance in parallel to the third inductor; and forming a resonant circuit by coupling a second capacitance in parallel to the first spiral inductor, wherein the resonate circuit oscillates at a center frequency. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification