| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that the reduction effect of distortion is lowered when a feedback quantity on a mutual conductance stage can not be secured. SOLUTION: The amplifier suitable for use as a radio frequency low noise amplifier comprises first, second and third mutual conductance stages (1, 2 and 3). The amplifier input is connected to the inputs of the first and third stages (1 and 3), whose outputs are connected together in anti-phase so as to provide feedforward error correction. The second stage (2) has inputs connected to the outputs of the first stage (1) and outputs connected across a resistor (6) to current feedback inputs of the first stage (1) so as to provide feedforward distortion canceling so as to improve the linearity of the amplifier. The negative feedback provided by the second stage (2) further improves the linearity without substantially increasing the noise figure of the amplifier. COPYRIGHT: (C)2003,JPO
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