Amplifier and tuner
AssigneeZarlink Semiconductor Inc.
InventorArshad Madni
Life of this patent
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Abstract
An amplifier which is suitable for use as a radio frequency low noise amplifier comprises first, second and third transconductance stages. The amplifier input is connected to the inputs of the first and third stages, whose outputs are connected together in anti-phase so as to provide feedforward error correction. The second stage has inputs connected to the outputs of the first stage and outputs connected across a resistor to current feedback inputs of the first stage so as to provide negative feedback. The first and third stages provide feedforward distortion cancelling so as to improve the linearity of the amplifier. The negative feedback provided by the second stage further improves the linearity without substantially increasing the noise figure of the amplifier.
Claims16
An amplifier comprising:
- an amplifier input;
- an amplifier output;
- a first transconductance stage having a first input connected to said amplifier input, a current feedback input, and a first output connected to said amplifier output;
- a second transconductance stage having a second input connected to said amplifier output and a second output connected to said current feedback input to provide negative feedback;
- and a third transconductance stage having a third input connected to said amplifier input and a third output connected to said amplifier output to provide feedforward error correction.
Dependencies are inferred from the claim text.