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US 6,556,085 B2Granted
Low power low noise amplifier
AssigneeKorea Advanced Institute of Science and Technology
InventorsIck Jin Kwon, Joon Ho Gil, Hyung Cheol Shin
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Abstract
A low power low noise amplifier achieves a high power gain without increasing power consumption by sharing the bias current. The amplifier is composed of a cascade structure which consists of a parallel connected common source transistor and common gate transistor connected to a common source transistor, an inverter type structure connected to the common source transistor, and structure improving the third-order intermodulation component using the parallel connected common source transistor and common gate transistor.
Claims1
A low power low noise amplifier, comprising:
- a common source transistor M1;
- a common source transistor M2;
- a common gate transistor M3 having a drain connected to a drain of the common source transistor M2;
- a capacitor C1 having one end coupled to a drain of the common source transistor M1 and a second end coupled to a gate of the common source transistor M2 and to a source of the common gate transistor M3,
- wherein a signal amplified by the common source transistor M1 is amplified after being coupled by capacitor C1 and then being applied to the gate of the common source transistor M2, a third-order intermodulation output of transistors M2 and M3 have opposite polarity to each other so that a total third-order intermodulation is cancelled at said connection between the drains of the transistors M2 and M3, and the transistors M1, M2, and M3 share a bias current.
2 more elements
Dependencies are inferred from the claim text.