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I-Q-modulator-and-I-Q-demodulator

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Comparison circuit for masking transient differences

I claim: 1. A comparison circuit for comparing first and second binary signals which are ...

Six channel digital demodulator

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Fiber optic switching network

FIG. 1 shows a ring wiring center (RWC) represented by broken block 10. The center includes a ...

I/Q-modulator and I/Q-demodulator

Details

Inventors: Murtojarvi, Simo;
Assignee: Nokia Mobile Phones Ltd. (Salo, FI)
Primary Examiner: Grimm; Siegfried H.
Assistant Examiner:
Attorney, Agent or Firm: Perman & Green

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.

DETAILED DESCRIPTION According to the present invention there is provided an I/Q-modulator or I/Q-demodulator comprising capacitors so coupled that the modulating signals can be provided through a pair of output phase shift branches of the circuit, from which the output signal is obtained, without the modulating signals loading the output at the output frequency.

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