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US 7,376,409 B2Granted
Bandpass filter with integrated variable gain function using improved resistor array
AssigneeBroadcom Corporation
InventorMeng-An Pan
Life of this patent
Estimating the term…
Abstract
The invention enables a gain adjustment in a receiver to improve signal quality by varying resistance of an input resistor array of a bandpass filter, the array having a plurality of resistors in series with switches that out of the path of the current when the resistors are in use.
Claims17
A method, comprising:
- filtering a signal with a bandpass filter;
- measuring the signal to noise ratio of the filtered signal;
- and
- adjusting the bandpass filter to increase the gain if the signal to noise ratio is insufficient by varying resistance of an input resistor array of the filter, the array having a plurality of resistors in series with switches that are out of the path of the current when the resistors are in use.
1 more element
A system, comprising:
- means for filtering a signal with a bandpass filter;
- means for measuring sufficiency of the signal to noise ratio of the filtered signal;
- and
- means for adjusting the bandpass filter to increase the gain if the signal to noise ratio is insufficient by varying resistance of an input resistor array of the filter, the array having a plurality of resistors in series with switches that are out of the path of the current when the resistors are in use.
1 more element
A system, comprising:
- a bandpass filter capable of filtering a received signal and capable of amplifying an amplitude of the received signal by varying resistance of an input resistor array of the filter, the array having a plurality of resistors in series with switches that are out of the path of the current when the resistors are in use;
- and
- at least one baseband circuit, communicatively coupled to the bandpass filter, capable of measuring sufficiency of the signal to noise ratio of a signal output from the bandpass filter.
Dependencies are inferred from the claim text.