Direct microwave modulation and demodulation device
First Claim
1. A device for direct modulation or demodulation of microwaves, said device being comprised of first and second mixers that deliver (in demodulation) or receive (in modulation) respectively an in-phase signal and a quadrature signal, said first mixer being controlled by two signals whose phase angles are 0 and 180 degrees respectively, said second mixer being controlled by two signals whose phase angles are 90 and 270 degrees respectively, the four signals being delivered by first and second phase shifters, wherein said device further comprisies a voltage controlled local oscillator that supplies first and second signals in phase opposition, said first signal having a 0 degree phase angle and being supplied to said first phase shifter, and said second signal having a 180 degree phase opposition and being supplied to said second phase shifter.
1 Assignment
0 Petitions
Accused Products
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 ÷2 divider to inputs of the two mixers, and in-phase and quadrature signals are obtained at respective mixer outputs.
-
Citations
6 Claims
- 1. A device for direct modulation or demodulation of microwaves, said device being comprised of first and second mixers that deliver (in demodulation) or receive (in modulation) respectively an in-phase signal and a quadrature signal, said first mixer being controlled by two signals whose phase angles are 0 and 180 degrees respectively, said second mixer being controlled by two signals whose phase angles are 90 and 270 degrees respectively, the four signals being delivered by first and second phase shifters, wherein said device further comprisies a voltage controlled local oscillator that supplies first and second signals in phase opposition, said first signal having a 0 degree phase angle and being supplied to said first phase shifter, and said second signal having a 180 degree phase opposition and being supplied to said second phase shifter.
Specification