Invention Grant
US08385457B2 Methods and systems to compensate IQ imbalance in wideband zero-if tuners 有权
补偿宽带零无功调谐器智能失衡的方法和系统

Methods and systems to compensate IQ imbalance in wideband zero-if tuners
Abstract:
Methods and systems to compensate IQ imbalances in a tuner system, including relatively wideband ZIF tuner systems and tuner systems having substantially linear frequency dependent phase imbalance, where a one-tap compensation element may be utilized to compensate frequency dependent phase imbalance. A two tone probe may be applied in controlled loop-back modes, and resultant baseband components may be used to determine a straight line from which to determine compensation. The probe may include a Multi-Media over Coax Alliance (MoCA) Type 2 probe. Compensation parameters may be determined as fixed or non-adaptive compensation parameters in a digital domain and may be applied at baseband. One or more compensation values may be determined in a fixed point circuit.
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