Frequency mixer with compensated DC offset correction to reduce linearity degradation
First Claim
1. An apparatus comprising:
- a frequency mixer circuit configured to generate a baseband signal based on a local oscillator signal and a radio frequency signal; and
a compensation circuit configured to generate a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal, the DC offset compensation signal and the second signal having currents approximately equal in magnitude and opposite in direction, a current of the DC offset-compensated signal being substantially the same as a current of the baseband signal.
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Abstract
An apparatus includes a frequency mixer circuit configured to generate a baseband signal based on a local oscillator signal and a radio frequency signal. The apparatus includes a compensation circuit configured to generate a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal. The DC offset compensation signal and the second signal have currents approximately equal in magnitude and opposite in direction. A current of the DC offset-compensated signal is substantially the same as a current of the baseband signal. The compensation circuit may include a DC digital-to-analog converter circuit configured to generate the DC offset compensation signal and the second signal based on a control signal.
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Citations
20 Claims
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1. An apparatus comprising:
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a frequency mixer circuit configured to generate a baseband signal based on a local oscillator signal and a radio frequency signal; and a compensation circuit configured to generate a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal, the DC offset compensation signal and the second signal having currents approximately equal in magnitude and opposite in direction, a current of the DC offset-compensated signal being substantially the same as a current of the baseband signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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generating a baseband signal based on a radio frequency signal and a local oscillator signal; and generating a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal, the DC offset compensation signal and the second signal having currents approximately equal in magnitude and opposite in direction, a current of the DC offset-compensated signal being substantially the same as a current of the baseband signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a mixer circuit; and means for compensating for a DC offset in a baseband signal of a receiver path including the mixer circuit by introducing a DC offset voltage and zero net current into the baseband signal.
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Specification