High dynamic range time-varying integrated receiver for elimination of off-chip filters
AssigneeAxiom Microdevices, Inc.
InventorsAlyosha Molnar, Rahul Magoon
Life of this patent
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Abstract
A quadrature mixer with an LO input is provided. The quadrature mixer receives a signal having a frequency FLO and a signal input having a frequency FSIG, and has an output that comprises an output impedance that is high at frequencies of |FLO−FSIG | and |FLO+FSIG| and low at other. A mixer coupled to the output impedance interacts with the output impedance such that an impedance presented at the signal input is high for signals at FSIG if FSIG is a predetermined signal frequency, and low at other frequencies.
Claims21
A receiver circuit comprising:
- a quadrature passive mixer having an input and an output;
- one or more output impedances coupled to the output of the quadrature passive mixer wherein an input impedance of the quadrature passive mixer provides a band-pass response;
- a low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range;
- and
- wherein the LNA and the quadrature passive mixer are configured so that a band-pass mixer input impedance response is presented to the output of the LNA so as to substantially reduce a LNA voltage gain for unwanted signals presented to the LNA input.
A receiver circuit comprising:
- a mixer having an input and an output;
- one or more output impedances coupled to the output of the mixer wherein an input impedance of the mixer provides a band-pass response;
- and
- a low noise amplifier (LNA) having an input and an output coupled to the mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range.
A receiver circuit comprising:
- a quadrature passive mixer having an input and an output;
- means coupled to the output of the quadrature passive mixer for providing a band-pass response of an input impedance of the quadrature passive mixer;
- and
- a low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range.
A receiver circuit comprising:
- a mixer having an input and an output;
- one or more output impedances coupled to the output of the mixer providing an input impedance of the mixer with a band-pass response;
- a low noise amplifier (LNA) having an input and an output and providing substantially linear transconductance over a predetermined input range coupled to the mixer;
- and
- wherein a band-pass mixer input impedance response is presented to the output of the LNA.
A receiver comprising:
- a quadrature passive mixer having an input and an output and an input impedance and providing a band-pass response;
- a low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range;
- and
- wherein the LNA and the quadrature passive mixer are configured so that a band-pass mixer input impedance response is presented to the output of the LNA so as to substantially reduce a LNA voltage gain for unwanted signals presented to the LNA input.
Dependencies are inferred from the claim text.