Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1989-12-12
1992-06-16
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
329305, 329306, 375 39, 375 53, 375 67, 375 80, 331117FE, 331117D, 331177V, H04L 2736, H04L 2738
Patent
active
051227657
ABSTRACT:
A microwave circuit intended for either direct modulation or direct demodulation of a microwave link communications signal is characterized in that a local oscillator (8) is incorporated in the circuit. The local oscillator supplies two signals that are in phase opposition at 180 degrees. Each signal is sent to a phase shifter. The first phase shifter (9) supplies two signals that are in quadrature, at 0 and 90 degrees. The second phase shifter supplies two signals in quadrature at 180 and 270 degrees. The 0 and 180 degree signals are sent to a first mixer (2), while the 90 and 270 degree signals are sent to a second mixer (3). In the case of a modulator, the first and second mixers receive, respectively, in-phase and quadrature signals, and the outputs of the mixers are combined to form a modulated signal. In the case of a demodulator, a modulated signal is applied through a .div.2 divider to inputs of the two mixers, and in-phase and quadrature signals are obtained at respective mixer outputs.
REFERENCES:
Philips Journal of Research, vol. 41, No. 3, 1986, pp. 219-231, Eindhoven, NL, R. A. Brown et al., "Some Features of Signal Demodulation Resulting from the Practical Implementation of a Direct Conversion Radio Receiver".
IEEE Gallium Arsenide Integrated Circuit Symposium, Portland, Oreg., Oct. 13-16, 1987, pp. 227-230, IEEE, New York, US, K. W. Lee et al., "Push-Push, Frequency-Doubling, MMIC Oscillators".
Prentice-Hall, Inc., Englewood Cliffs, N.J., US, 1984, pp. 180-183, G. Gonzales, "Microwave Transistor Amplifiers Analysis and Design".
Grimm Siegfried H.
Thomson Composants Microondes
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