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US 7,623,601 B2Granted
Controlling gain in a satellite receiver
AssigneeSilicon Laboratories Inc.
InventorsRamin Khoini-Poorfard, David Trager
Life of this patent
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Abstract
In one embodiment, the present invention includes a method for digitally detecting a first signal strength corresponding to a multi-channel spectrum of an incoming radio frequency (RF) spectrum and digitally detecting a second signal strength corresponding to a selected channel of the incoming RF spectrum. Based on these values, one or more one gain stages of a receiver, such as a satellite television receiver for the incoming RF spectrum, may be controlled. Other embodiments are described and claimed.
Claims15
A method comprising:
- digitally detecting a first signal strength corresponding to a multi-channel spectrum of an incoming radio frequency (RF) spectrum;
- digitally detecting a second signal strength corresponding to a selected channel of the incoming RF spectrum;
- and
- controlling at least one gain stage based on the first signal strength and the second signal strength, including setting a first target level for a first ratio of the first signal strength to an analog-to-digital converter (ADC) full-scale value, controlling the at least one gain stage to attain the first target level, determining a second ratio of the second signal strength to the ADC full-scale value at the first target level, and setting a second target level for the first ratio if the second ratio is less than a predetermined threshold.
1 more element
An apparatus comprising:
- an analog receiver path to receive an incoming radio frequency (RF) signal spectrum and to generate a multi-channel conditioned signal, and including an analog-to-digital converter (ADC) to convert the output of a wideband analog filter to the multi-channel conditioned signal;
- a digital receiver path coupled to the analog receiver path to process the multi-channel conditioned signal to obtain a single channel digital signal;
- a first power detector coupled to measure a first power level corresponding to the multi-channel conditioned signal;
- a second power detector coupled to measure a second power level corresponding to the single channel digital signal;
- and
- a controller to control at least one gain stage of the apparatus based on the first power level and the second power level, the at least one gain stage based on a first ratio between the first power level and a full scale value of the ADC and a second ratio between the second power level and the full scale value.
3 more elements
A system comprising:
- a first gain stage to receive an incoming radio frequency (RF) spectrum and to apply a gain to the incoming RF spectrum;
- an analog filter coupled to the first gain stage to generate a wideband filtered signal from the incoming RF spectrum;
- an analog-to-digital converter (ADC) coupled to the analog filter to convert the wideband filtered signal into a digital signal;
- a first detector coupled to the ADC to detect a strength of the digital signal;
- a digital filter coupled to the ADC to generate a narrowband filtered signal from the digital signal;
- a second detector coupled to the digital filter to detect a strength of the narrowband filtered signal;
- and
- a controller to control the first gain stage based on the strength of the digital signal and the strength of the narrowband filtered signal, so that a power level of a selected channel within the incoming RF spectrum is at least a minimum predetermined amount above a quantization noise level for the ADC.
5 more elements
Dependencies are inferred from the claim text.