Noise cancelling baseband amplifier
First Claim
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1. An apparatus comprising:
- a low noise amplifier;
a mixer coupled to the low noise amplifier and configured to receive a signal output by the low noise amplifier;
a first differential amplifier having an inverting input configured to receive an input signal from the mixer and having an output configured to be coupled to an inverting input of a second differential amplifier; and
a single-ended amplifier having an input coupled to the first input of the first differential amplifier and having an output configured to be coupled to a non-inverting input of the second differential amplifier, the single-ended amplifier configured to receive the input signal.
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Abstract
An apparatus includes a first amplifier having a first feedback resistance and an output configured to be coupled to a first input of a second amplifier having a second feedback resistance. The apparatus includes a third amplifier coupled to an input of the first amplifier and having an output configured to be coupled to a second input of the second amplifier.
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Citations
21 Claims
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1. An apparatus comprising:
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a low noise amplifier; a mixer coupled to the low noise amplifier and configured to receive a signal output by the low noise amplifier; a first differential amplifier having an inverting input configured to receive an input signal from the mixer and having an output configured to be coupled to an inverting input of a second differential amplifier; and a single-ended amplifier having an input coupled to the first input of the first differential amplifier and having an output configured to be coupled to a non-inverting input of the second differential amplifier, the single-ended amplifier configured to receive the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. An apparatus comprising:
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means for amplifying, with low noise, signals; means for mixing signals, the means for mixing coupled to the means for amplifying to receive the amplified signals; and means for filtering received signals, the means for filtering coupled to the means for mixing to receive the mixed signals, and the means for filtering comprising; first means for amplifying including an inverting input configured to receive an input signal and including an output configured to be coupled to an inverting input of second means for amplifying; and third means for amplifying including an input coupled to the first input of the first means for amplifying and including an output coupled to a non-inverting input of the second means for amplifying, the third means for amplifying configured to receive the input signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of processing signals, the method comprising:
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performing, at a low noise amplifier, a low noise amplification operation on a signal to generate an input signal; amplifying the input signal at a first differential amplifier to produce a first amplified signal that is provided to an inverting input of a second differential amplifier, the input signal received at an inverting input of the first differential amplifier; amplifying the input signal at a single-ended amplifier to produce a flicker noise canceling signal that is provided to a non-inverting input of the second differential amplifier, wherein the single-ended amplifier receives the input signal at an input coupled to a first input of the first differential amplifier; and amplifying the first amplified signal and the flicker noise canceling signal at the second differential amplifier to produce an output signal. - View Dependent Claims (18, 19, 20)
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Specification