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US 7,466,205 B1Granted
Ultra-wideband low noise amplifier and amplification method thereof
AssigneeNational Taiwan University
InventorsYu Tso Lin, Shey Shi Lu
Life of this patent
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Abstract
An ultra wideband low noise amplifier (UWB LNA) and amplification method thereof, providing a substantially achieved bandwidth extension by pole-zero cancellation and utilized to transform input impedance matching up to 50 ohm for gaining low noise figure. The ultra-wideband low noise amplifier is composed of a capacitive-feedback amplifier, a resistive-feedback amplifier, an inductive-feedback amplifier, and a buffer amplifier.
Claims24
An ultra wideband low noise amplifier (UWB LNA), comprising:
- a capacitive-feedback amplifier including a transistor taken as active component;
- a resistive-feedback amplifier, connected to the output of capacitive-feedback amplifier, including a transistor taken as active component;
- an inductive-feedback amplifier, connected to the output of resistive-feedback amplifier, including a transistor taken as active component;
- and
- a buffer amplifier, connected to the output of the inductive-feedback amplifier, including a transistor taken as active component;
- wherein the basic configuration of the amplifiers is a common-emitter amplifier.
3 more elements
A method for transforming an ultra wideband low noise amplifier comprising the steps of:
- matching input impedance by a capacitive-feedback amplifier;
- extending bandwidth by
- connecting a resistive-feedback amplifier to the out of capacitor-feedback amplifier;
- connecting an inductive-feedback amplifier to the output of resistive-feedback amplifier;
- and
- connecting a buffer amplifier to the output of inductive-feedback amplifier;
- whereby the UWB LNA circuit is formed to achieve pole-zero cancellation to extend bandwidth.
4 more elements
Dependencies are inferred from the claim text.