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US 6,784,738 B1Granted
Method and apparatus for gain control in a CMOS low noise amplifier
AssigneeMarvell International Ltd.
InventorsXiaodong Jin, Lawrence Tse
Life of this patent
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Abstract
An amplifier comprising a Low Noise Amplifier (LNA) to amplify a Radio Frequency (RF) signal. The LNA having a transconductance and including an input stage to receive the RF signal. The LNA again varying as a function of changes in conditions. A bias assembly to generate a bias current to bias the LNA input stage. The bias assembly configured to reduce variation of the LNA gain to changes in conditions.
Claims69
An amplifier, comprising:
- a Low Noise Amplifier (LNA) to amplify a Radio Frequency (RF) signal, the LNA having a transconductance and a gain and including an input stage to receive the RF signal, the LNA gain varying as a function of changes in conditions;
- a bias assembly to generate a bias current to bias the LNA input stage, the bias assembly configured to reduce variation of the gain of the LNA that is a function of changes in conditions, wherein bias assembly includes a bias circuit with a bias impedance, and wherein the bias current is a function of the bias impedance;
- and
- a calibration circuit that monitors changes in a calibratio that controls the bias impedance as a function of the changes in the calibration impedance.
1 more element
A method of amplifying an input signal, comprising:
- providing a Low Noise Amplifier (LNA) to receive and amplify the input signal;
- generating a bias current as a function of a bias impedance;
- supplying the bias current to the LNA;
- compensating for changes in the bias impedance to reduce LNA gain variations caused by changes in conditions by measuring variation of a calibration impedance in response to changes in conditions and controlling a value of the bias impedance based on the measured calibration impedance variation;
- and
- amplifying the input signal.
3 more elements
An amplifier, comprising:
- means for amplifying a Radio Frequency (RF) signal, the RF signal amplifying means having a transconductance and a gain and including input stage means for receiving the RF signal, the gain of the RF signal amplifying means varying as a function of changes in conditions;
- means for biasing the input stage means, the biasing means configured to reduce variation of the gain of the RF signal amplifying means that is a function of changes in conditions, wherein the biasing means includes generating means that includes a bias impedance for generating a bias current as a function of the bias impedance;
- and
- calibration means for monitoring changes in a calibration impedance and for controlling the bias impedance as a function of the chances in the calibration impedance.
1 more element
An amplifier, comprising:
- a Low Noise Amplifier (LNA) that has an input stage that receives Radio Frequency (RF) signals, a transconductance, and gain that varies as a function of changes in conditions;
- and
- a bias circuit that has a bias impedance and that generates a bias current for said LNA input stage based on said bias impedance;
- and
- a calibration circuit that monitors changes in a calibration impedance, that adjusts the bias impedance as a function of the changes in the calibration impedance, and that reduces variation of the LNA gain based on said changes in conditions.
2 more elements
An amplifier, comprising:
- amplifying means for amplifying Radio Frequency (RF) signals and that has an input stage, a transconductance, and gain that varies as a function of changes in conditions;
- bias means for generating a bias current for said LNA input stage based on a bias impedance;
- and
- calibration means for monitoring changes in a calibration impedance, for adjusting the bias impedance as a function of the changes in the calibration impedance, and for reducing variation of the LNA gain based on said changes in conditions.
1 more element
Dependencies are inferred from the claim text.