Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1994-09-07
1995-11-21
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
329305, 329306, 329348, 329358, 329366, 332152, 332172, 332178, 375261, 455102, H04L 2736, H04L 2738
Patent
active
054691265
ABSTRACT:
An I/Q-modulator or I/Q demodulator circuit in which the modulating signals (2, 3) are input through the output phase transfer branches of the circuit. In relation to the RF-characteristics, a series resistor (16) and a series inductance (20) in the phase transfer circuits are grounded with small capacitors (23, 25). A capacitor (17) having a high impedance at the modulating frequency is located between the branches. Tho modulating signals are not summed through the capacitor (17), and, thus, their phase difference is not weakened.
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Patent Abstract of Japan, No. JP63209207, Pub. Date Aug. 30, 1988, Kashiwagi Michio.
Grimm Siegfried H.
Nokia Mobile Phones Ltd.
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