Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1996-08-01
1997-10-14
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455327, 455330, 455333, H04B 126
Patent
active
056782241
ABSTRACT:
The useful frequency range of an I/Q diode modulator is increased by adding two capacitors (15, 16) and an inductance (17), or two inductances and one capacitance, as a series-resonant circuit. The capacitors (15, 16) are connected in series and have a zero voltage at their connection point so that the inductance (17) does not influence the oscillator signal. The inductance (17) is chosen so that resonance occurs at the frequency at which leakage across the diodes would otherwise occur, so that the impedance between ground and the diode (4, 5) connection point is very low and, therefore, so is leakage between the mixer outputs. When the diode elements conduct, the voltage at the point between the diodes (4, 5 or 4a, 5a) is connected to both branches of the transformer (8) secondary so that the branches have equal voltages with the same phase. This permits an I/Q modulator or I/Q demodulator for 400 MHz or even 900 MHz frequency to be made with ordinary UHF mixer diodes.
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Eisenzopf Reinhard J.
Le Thanh
Nokia Mobile Phones Ltd.
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