Apparatus for controlling modulation of an alternating waveform on a DC voltage signal within a low-noise block controller
AssigneeSilicon Laboratories Inc.
InventorScott Allan Woodford
Life of this patent
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Abstract
An apparatus for controlling modulation of an alternating waveform on a direct current (DC) voltage signal within a low-noise block (LNB) controller is disclosed. The apparatus includes a DC power supply and a mixing/switching circuit. The DC power supply provides a steady DC voltage to a load, such as an LNB amplifier. The mixing/switching circuit adds a modulating signal to the DC voltage and selectively allows the modulated DC voltage to the load. The mixing/switching circuit includes a common control signal input for managing both of the above-mentioned two functions.
Claims12
An apparatus for controlling modulation of an alternating waveform on a direct current (DC) signal intended for a load, said apparatus comprising:
- a DC power supply for providing a DC voltage;
- and
- a mixing/switching circuit includes a first transistor, a capacitor and a resistor for adding a modulating signal from signal input to said DC voltage and further includes a second and third transistors, two resistors and two diodes for selectively allowing said modulated DC voltage to supply said load, and a common control signal input for controlling said adding function and said selectively allowing function.
A low-noise block (LNB) control device capable of controlling modulation of an alternating waveform on a direct current (DC) voltage from a DC power supply to an LNB amplifier, said LNB control device comprising:
- a power supply feedback line for receiving a power supply feedback signal from said DC power supply;
- a power supply control line for sending a control signal to said DC power supply in response to said received power supply feedback signal;
- an LNB amplifier feedback line for receiving a LNB amplifier feedback signal from said LNB amplifier;
- and
- a modulating/switch control line for sending a modulating/switch control signal to a mixing/switching circuit in response to said received LNB amplifier feedback signal, wherein said modulating/switch control signal adds a modulating waveform from signal input to said DC voltage and selectively allows said modulated DC voltage to reach said LNB amplifier.
Dependencies are inferred from the claim text.