Method for adjusting a phase angle of a phase modifier of a...

Pulse or digital communications – Transmitters – Angle modulation

Reexamination Certificate

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Details

C375S329000, C375S279000, C455S024000, C455S069000, C455S126000, C330S260000, C330S294000

Reexamination Certificate

active

07020216

ABSTRACT:
A method for adjusting a phase angle (φ) of a phase modifier (25) of a transmitting device which includes a quadrature modulator (3), a power amplifier (9), a quadrature demodulator (19) and differential amplifiers (26, 27). The power amplifier (9) is linearized via the feedback loop (16) according to the Cartesian feedback method. The phase modifier (25) supplies an oscillator signal to the quadrature demodulator (19), which signal is shifted by the phase angle (φ) to be adjusted with regard to the oscillator signal that is supplied to the quadrature modulator (3). An input signal with a constant inphase component (I) and a constant quadrature phase component (Q) is applied during each transmission burst in the instance of a closed feedback loop, and the quadrature component (VQM) and/or the inphase component (VIM) is measured at a measuring point (53, 61) located behind the output of the differential amplifiers (26, 27).

REFERENCES:
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5623226 (1997-04-01), Whitmarsh et al.
patent: 5793817 (1998-08-01), Wilson
patent: 5894496 (1999-04-01), Jones
patent: 6466628 (2002-10-01), Kim
patent: 0 706 259 (1996-04-01), None
patent: WO 98/00908 (1998-01-01), None
patent: WO 99/04486 (1999-01-01), None
patent: WO 99/17439 (1999-01-01), None
patent: WO 00/25421 (2000-05-01), None

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