摘要 |
Apparatus and method for a fully digital quadrature architecture for a complex modulator. The complex modulator can substitute for existing prior art analog quadrature modulator structures and those based on a digital polar architecture (r, ?). The complex modulator (110) comprises an I switch array (120), Q switch array (112) and matching network (114). The modulator effectively operates as a complex digital-to-analog converter where the digital inputs are given in Cartesian form, namely I and Q representing the complex number I + jQ, while the output is a modulated RF signal having a corresponding amplitude and phase shift. The phase shift being with respect to a reference phase dictated by the local oscillator, which is also input to the converter/modulator. Several embodiments are provided including modulators incorporating dual I and Q transistor arrays, a single shared I/Q transistor array, modulators with single ended and differential outputs and modulators with single and dual polarity clock and I/Q data signals.
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申请人 |
TEXAS INSTRUMENTS INCORPORATED;ELIEZER, OREN, E.;CRUISE, FRANCIS, P.;STASZEWSKI, ROBERT, B. |
发明人 |
ELIEZER, OREN, E.;CRUISE, FRANCIS, P.;STASZEWSKI, ROBERT, B. |