Quadrature signal generator having digitally-controlled phase an

Details Quadrature signal generator having digitally-controlled phase an Quadrature signal generator having digitally-controlled phase an

1986-02-03

1987-09-22

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 39, 328162, 332 23R, H04L 2549

Patent

active

046960171

ABSTRACT:
A digitally-controlled quadrature signal generator is provided having a frequency synthesizer for receiving a digital input signal and in response thereto generating an output signal having a predetermined frequency. The output signal is split to produce an in-phase (I) signal and a quadrature-phase (Q) signal. A first table look-up memory is provided for generating a predetermined phase correction signal for use in cancelling any phase error in the quadrature-phase signal. A mixer receives the phase correction signal and the in-phase signal and in response thereto generates a phase error signal. The phase error signal is then added to the quadrature-phase signal to thereby cancel the undesirable phase error. Moreover, programmable attenuator circuits or limiter circuits are provided to limit the in-phase and quadrature-phase signals and thereby cancel any undesirable amplitude error components therein.

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