Tuning techniques for I/Q channel signals in microwave digital t

Details Tuning techniques for I/Q channel signals in microwave digital t Tuning techniques for I/Q channel signals in microwave digital t

1993-03-24

1994-12-06

Dolinar, Andrew M.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 39, 375 60, 455126, H04L 2736

Patent

active

053714814

ABSTRACT:
Structure and technique, for calibrating a vector modulator that does not require a network analyzer, are disclosed which are incorporated in a vector modulation system comprising a standard vector modulator circuit including means for shifting phase to adjust the relative phases of the I and Q components of the modulated RF carrier. Means for attenuating are included in the I and Q modulation system to adjust the relative amplitude of the modulation signals. The disclosure describes a technique wherein the microwave transmitter's I and Q phase difference is measured by measuring the power levels of the I and the Q signals. The power levels are compared and a correction value is stored in a read-only memory to compensate for the error. More particularly, the error compensation is achieved by first determining amplitude error or unbalance by I and Q signal power measurement and an amplitude compensation signal is stored, then a power measurement is carried out for phase compensation and a phase compensation signal is stored.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata
patent: 5012208 (1991-04-01), Makinen et al.
patent: 5021753 (1991-06-01), Chapman
patent: 5293407 (1994-03-01), Shibata

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