Neoreach, Inc.

Dong Kyun Kang

Jay Wright

Sang-Gug Lee

Kurt Gordon

Choong-yul Cha

A low noise amplifier is provided for the receiver of a wireless communications system. The amplifier incorporates an image rejection function by incorporating a notch filter formed by an inductor and capacitor connected at a node between two active elements of the amplifier. The amplifier also incorporates a gain control function by adding a further active element connected to, on one hand, a node between the inductor and capacitor and, on the other hand, a voltage supply. A gain control signal is connected to the control input of the further active element has an input connected to a feedback lead of the receiver to provide the gain control.

Low noise amplifier for wireless communications

A voltage controlled oscillator is provided. The oscillator has an oscillator amplifier core formed of a complementary pair of FETs connected with their gates in common and connected to share a bias current. An inductance is connected between the common gates and the common drains of the FETs. The inductance may be an inductor element or an inductance of a physical structure of the circuit, such as a bond wire. The voltage controlled oscillator includes a variable capacitor stage connected at the input of the oscillator amplifier stage and a buffer amplifier stage connected at the output of the oscillator amplifier stage. The buffer amplifier of one embodiment includes a pair of complementary FETs having common gates connected to the common drains of the FETs of the oscillator amplifier stage. The buffer amplifier stage also include an inductor and a capacitor connected between common drains of the buffer amplifier FETs and the output.

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North Potomac, MD, United States of America

Dong Kyun Kang