Title:
METHOD FOR ADJUSTING A PHASE ANGLE OF A PHASE MODIFIER OF A TRANSMITTING DEVICE
Document Type and Number:
WIPO Patent Application WO2001024467
Kind Code:
A3
Abstract:
The invention relates to a method for adjusting a phase angle (φ) of a phase modifier (25) of a transmitting device which comprises 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). Said oscillator 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). According to the invention, 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).
Inventors:
LIPP FRIEDRICH (AT)
Application Number:
PCT/EP2000/006078
Publication Date:
September 27, 2001
Filing Date:
June 29, 2000
Export Citation:
Assignee:
ROHDE & SCHWARZ (DE)
LIPP FRIEDRICH (AT)
LIPP FRIEDRICH (AT)
International Classes:
H03F1/32; H03F1/34; H04L27/36; (IPC1-7): H04L27/36; H03F1/32
Domestic Patent References:
| WO2000025421A1 | 2000-05-04 | |||
| WO1999004486A1 | 1999-01-28 | |||
| WO1998000908A1 | 1998-01-08 |
Foreign References:
| US5894496A | 1999-04-13 | |||
| US5793817A | 1998-08-11 |
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