Pulse or digital communications – Transmitters – Angle modulation
Reexamination Certificate
2006-03-28
2006-03-28
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transmitters
Angle modulation
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).
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Caesar Rivise Bernstein Cohen & Pokotilow Ltd.
Chin Stephen
Rohde & Schwarz GmbH & Co KG
Wang Ted
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