Direct down-conversion mixer architecture
First Claim
Patent Images
1. A direct down-conversion mixer, comprising:
- an LO switching pair coupled to receive an RF input signal and produce a down converted output signal;
an integrator coupled to receive the output signal and produce an integrator output signal; and
a control circuit coupled to receive an LO input voltage and the integrator output signal to provide a control signal that is coupled to the LO switching pair so as to offset asymmetry in said LO switching pair, said control circuit comprising a second control circuit coupled to receive the integrator output signal and produce the control signal and a replica amplifier coupled to the second control circuit to receive the control signal.
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Abstract
Direct down-conversion mixer. A direct down-conversion mixer is provided. The mixer comprises an LO switching pair coupled to receive an RF input signal and produce a down converted output signal. The mixer also comprises an integrator coupled to receive the output signal and produce an integrator output signal. The mixer also comprises a control circuit coupled to receive an input voltage and the integrator output signal to produce a control signal that is coupled to the LO switching pair.
124 Citations
13 Claims
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1. A direct down-conversion mixer, comprising:
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an LO switching pair coupled to receive an RF input signal and produce a down converted output signal; an integrator coupled to receive the output signal and produce an integrator output signal; and a control circuit coupled to receive an LO input voltage and the integrator output signal to provide a control signal that is coupled to the LO switching pair so as to offset asymmetry in said LO switching pair, said control circuit comprising a second control circuit coupled to receive the integrator output signal and produce the control signal and a replica amplifier coupled to the second control circuit to receive the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A direct down-conversion double balanced mixer, comprising:
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a first LO switching pair coupled to receive an RF input signal and produce a first down converted output signal; a second LO switching pair coupled to receive an RF input signal and produce a second down converted output signal; a first integrator coupled to receive the first down converted output signal and produce a first integrator output signal; a second integrator coupled to receive the second down converted output signal and produce a second integrator output signal; a first control circuit coupled to receive a first LO input voltage and the first integrator output signal to provide a first control signal that is coupled to the first LO switching pair so as to offset asymmetry in said first LO switching pair; and a second control circuit coupled to receive a second LO input voltage and the second integrator output signal to produce a second control signal that is coupled to the second LO switching pair.
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9. A method of operating a direct down-conversion mixer, comprising:
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receiving an RF signal at an LO switching pair to produce a down converted output signal; receiving the output signal at an integrator to produce an integrator output signal; and receiving an LO input voltage and the integrator output signal at a control circuit to produce a control signal that is coupled to the LO switching pair so as to offset asymmetry in said LO switching pair;
wherein the step of receiving the LO input voltage further comprises receiving the integrator output signal at a second control circuit that produces the control signal and receiving the control signal at a replica amplifier that is coupled to the second control circuit. - View Dependent Claims (10)
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11. A direct down-conversion mixer, comprising:
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an LO switching pair means for receiving an RF input signal to produce a down converted output signal; an integrator means for receiving the output signal and producing an integrator output signal; and a control circuit means for receiving an LO input voltage and the integrator output signal to produce a control signal that is coupled to the LO switching pair so as to offset asymmetry in said LO switching pair, said control circuit means comprising a second control circuit means for receiving the integrator output signal and producing the control signal and a replica amplifier means coupled to the second control circuit means for receiving the control signal. - View Dependent Claims (12, 13)
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Specification