Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-04-05
2005-04-05
Trinh, Sonny (Department: 2687)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S341000, C455S333000
Reexamination Certificate
active
06876843
ABSTRACT:
A radio frequency amplifier of improved intermodulation performance is provided by connecting first and second transconductance amplifiers in antiphase so that third order intermodulation products cancel each other but the reduction in gain is relatively small. The transconductance stages comprise long tail pairs of transistors provided with tail current sources formed by transistors whose bases are connected to a bias voltage source. The first transistor has an emitter connected via a resistor to ground. The second transistor has an emitter connected via another resistor to the emitter of the first transistor.
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Madni Arshad
Mudd Mark
Thompson Hine LLP
Trinh Sonny
Zarlink Semiconductor Limited
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