METHODS AND APPARATUS FOR ADAPTIVE LOCAL OSCILLATOR NULLING
First Claim
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1. A method, comprising:
- (a) setting first and second offset adjust signals to initial levels based upon temperature and frequency information for minimizing local oscillator (LO) leakage output from a frequency mixer receiving inphase (I) and quadrature (Q) signals;
(b) measuring LO leakage during operation of the frequency mixer; and
(c) adjusting the first and second offset adjust signals to minimize the LO leakage output.
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Abstract
Methods and apparatus to adaptively null leakage from a local oscillator.
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Citations
19 Claims
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1. A method, comprising:
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(a) setting first and second offset adjust signals to initial levels based upon temperature and frequency information for minimizing local oscillator (LO) leakage output from a frequency mixer receiving inphase (I) and quadrature (Q) signals; (b) measuring LO leakage during operation of the frequency mixer; and (c) adjusting the first and second offset adjust signals to minimize the LO leakage output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system, comprising:
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a frequency mixer to generate a radio frequency (RF) output; a digital-to-analog converter (DAC) coupled to the mixer to provide analog inphase (I) and quadrature (Q) and inphase and quadrature offset adjust signals; and a control module coupled to the DAC to provide digital inphase and quadrature signals; a temperature sensor coupled to the control module, wherein the control module sets the inphase and quadrature offset adjust signals to initial levels based upon temperature and frequency information for minimizing local oscillator (LO) leakage output from the frequency mixer; and a power detection circuit to measure the LO leakage during operation of the frequency mixer to enable adjustment of the inphase and quadrature offset adjust signals to minimize the LO leakage output. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system, comprising:
a transmitter including a frequency mixer to generate a radio frequency (RF) output; a digital-to-analog converter (DAC) coupled to the mixer to provide analog inphase (I) and quadrature (Q) and inphase and quadrature offset adjust signals; and a control module coupled to the DAC to provide digital inphase and quadrature signals; a temperature sensor coupled to the control module, wherein the control module sets the inphase and quadrature offset adjust signals to initial levels based upon temperature and frequency information for minimizing local oscillator (LO) leakage output from the frequency mixer; and a power detection circuit to measure the LO leakage during operation of the frequency mixer to enable adjustment of the inphase and quadrature offset adjust signals to minimize the LO leakage output. - View Dependent Claims (16, 17, 18, 19)
Specification