Inter-modulation interference inhibiting line amplifier
View Patent ↗Systems and methods are provided for using an inter-modulation interference inhibiting line amplifier that reduces signal losses for signals transmitted between a transmitting element and a receiving element. The present invention inhibits inter-modulation interference by separating the component signals of a transmitted signal into their component parts. The component signals are then adjusted for signal losses. Such adjusting includes amplification, equalization, and passing component signals through a gain control stage. The component signals are then recombined and transmitted to a receiving element or another line amplifier. The signal received by the line amplifier may be a signal transmitted by a transmitting element or another line amplifier.
1. A system for adjusting a composite signal transmitted from a VSAT transmitter to a VSAT receiver, wherein the composite signal includes at least a DC power signal, a clock signal, and a modulated-information signal, the system comprising:
a first set of filters comprising:
a first filter to separate the DC power signal from the composite signal;
a second filter to separate the clock signal from the composite signal; and
a third filter to separate the modulated-information signal from the composite signal;
a first amplifier to amplify the clock signal;
a gain control stage wherein the amplified clock signal is passed through the gain control stage;
a second amplifier to amplify the modulated-information signal;
an equalizer to equalize the amplified modulated-information signal;
a fourth filter to prevent the clock signal from being amplified by the second amplifier;
a fifth filter to prevent the clock signal from being amplified by the first amplifier; and
a signal combiner which receives the modulated-information signal from the fourth filter, the clock signal from the fifth filter, and the DC power signal and outputs a composite signal of the modulated-information signal from the fourth filter, the clock signal from the fifth filter, and the DC power signal.
2. The system defined in claim 1 wherein the VSAT transmitter is a VSAT gateway or a VSAT indoor unit.
3. The system defined in claim 1 wherein the VSAT receiver is a VSAT upconverter, or a VSAT outdoor unit.
4. The system defined in claim 1 wherein the modulated-information signal is amplified and equalized to vary the gain over the frequency to match the signal losses of the modulated-information signal over frequency.
5. The system defined in claim 1 wherein the clock signal is passed through a gain control stage and amplified to adjust the clock signal to match the signal losses of the clock signal.