Current-driven baseband filter with reduced adjacent channel leakage ratio (ACLR)
AssigneeQUALCOMM Incorporated
InventorsSeyed Hossein Miri Lavasani, Cheng-Han Wang, Abbas Komijani, Mohammad Bagher Vahid Far
Life of this patent
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Abstract
Certain aspects of the present disclosure provide methods and apparatus for processing an input signal. One example apparatus is a circuit that generally includes an amplifier, comprising a first transistor and a second transistor connected in cascode with the first transistor; a buffer coupled to an output of the amplifier and configured to provide feedback to the amplifier; and a current source coupled to the second transistor and incorporated into a loop of the feedback to the amplifier.
Claims18
A circuit comprising:
- an amplifier comprising:
- a first transistor;
- and
- a second transistor connected in cascode with the first transistor, wherein a source of the first transistor is coupled to an input of the amplifier and wherein a drain of the first transistor is coupled to a source of the second transistor;
- a buffer coupled to an output of the amplifier and configured to provide feedback to the amplifier;
- and
- a current source coupled to the second transistor and incorporated into a loop of the feedback to the amplifier.
A method for processing an input signal, comprising:
- amplifying, via an amplifier, the input signal, wherein the amplifier comprises a first transistor connected in cascode with a second transistor, wherein a source of the first transistor is coupled to an input node of the amplifier, and wherein a drain of the first transistor is coupled to a source of the second transistor;
- buffering, via a buffer, an output signal of the amplifier to generate a buffered signal;
- and
- feeding the buffered signal back to the amplifier via a feedback loop, wherein a current source is coupled to the second transistor and incorporated into the feedback loop.
An apparatus for processing an input signal, comprising:
- means for amplifying the input signal, wherein the means for amplifying comprises a first transistor connected in cascode with a second transistor, wherein a source of the first transistor is coupled to an input node of the means for amplifying and wherein a drain of the first transistor is coupled to a source of the second transistor;
- means for buffering an output signal of the means for amplifying to generate a buffered signal, wherein the buffered signal is provided as feedback to the means for amplifying;
- and
- means for sourcing current coupled to the second transistor and incorporated into a loop of the feedback to the means for amplifying.
Dependencies are inferred from the claim text.