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US 7,031,688 B2Granted
Direct-conversion receiver system and method with quadrature balancing and DC offset removal
AssigneeQuorum Systems, Inc.
InventorsLawrence J. Malone, Lon W. Christensen
Life of this patent
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Abstract
A system and method are provided for direct-conversion of a modulated radio-frequency (RF) signal. After receiving an RF signal, the RF signal is mixed with a plurality of oscillator signals with different phases in an interleaving manner.
Claims20
A method for direct-conversion of a modulated radio-frequency (RF) signal, comprising:
- receiving an RF signal;
- and
- mixing the RF signal with a plurality of oscillator signals with different phases in an interleaving manner to produce a plurality of baseband signals, each of the plurality of baseband signals including interleaved in-phase and quadrature baseband signals.
A direct-conversion subsystem, comprising:
- means for receiving an RF signal;
- and
- means for mixing the RF signal with a plurality of oscillator signals with different phases in an interleaving manner to produce a plurality of baseband signals, each of the plurality of baseband signals including interleaved in-phase and quadrature baseband signals.
A method for direct-conversion of a modulated signal, comprising:
- receiving a signal;
- and
- mixing the signal with a plurality of oscillator signals with different phases in an interleaving manner to produce a plurality of baseband signals, each of the plurality of baseband signals including interleaved in-phase and quadrature baseband signals.
A direct-conversion subsystem, comprising:
- a first mixer configured to receive an RF signal;
- a second mixer configured to receive the RF signal;
- a Local Oscillator (LO) configured to generate an oscillator signal;
- a polyphase network coupled to the LO and configured to generate a plurality of LO signals at different phases relative to the oscillator signal;
- and
- an LO phase interleaver configured to selectively couple each of the plurality of LO signals to the first and second mixers in an interleaving manner to generate baseband signals at the output of the first mixer and the second mixer, the baseband signals including interleaved in-phase and quadrature baseband signals based on the interleaving manner.
3 more elements
Dependencies are inferred from the claim text.