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US 8,138,831 B2Granted
Low noise amplifier
AssigneeHewlett-Packard Development Company, L.P.
InventorDavid E Smith
Life of this patent
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Abstract
A method for low noise signal amplification includes modifying a signal by way of a first amplification stage and conveying the modified signal to a second amplification stage. The method continues with comparing an output of the second amplification stage with a signal ground in a low-frequency feedback loop and changing a bias voltage for the first amplification stage as a result of the comparing step.
Claims9
A method for low noise signal amplification, comprising:
- modifying a signal by way of a first amplification stage;
- conveying the modified signal to a second amplification stage;
- coupling an output of the second amplification stage with an input to the first amplification stage by way of a high-frequency loop, the high-frequency loop including either a capacitor or a parallel combination of a resistor and a capacitor;
- comparing an output of the second amplification stage with a signal ground in a low-frequency feedback loop, the low-frequency feedback loop including an integrator configured to sample an output of the second amplification stage;
- and
- changing a bias voltage for the first amplification stage as a result of the comparing step.
3 more elements
A low noise amplifier, comprising;
- a first amplification stage;
- a second amplification stage coupled to the output of the first amplification stage;
- a low-frequency loop that integrates the output of the second amplification stage to form a low-frequency error signal, wherein the low-frequency error signal influences a bias voltage of the first amplification stage;
- and
- a high-frequency loop that couples an output of the second amplification stage with an input to the first amplification stage, the high-frequency loop including one of the group consisting of a capacitor and a parallel combination of a resistor and a capacitor.
2 more elements
Dependencies are inferred from the claim text.