Automatic gain control and tuned low noise amplifier for process-independent gain systems

1. A tuned low-noise amplifier for use in a GPS receiver, comprising:

a first current source;

a second current source;

a comparator, coupled to the first current source and the second current source, for providing a control signal; and

a third current source, receiving the control signal and coupled to the tuned low-noise amplifier, wherein a current in the third current source is proportional to a current in the first current source and the second current source, where values of the first current source, the second current source, and the third current source are based on a quasi-Proportional-To-Absolute-Temperature (PTAT) curve.

2. The tuned low-noise amplifier of claim 1 , wherein the first current source is a transistor.

3. The tuned low-noise amplifier of claim 1 , wherein the second current source is a transistor.

4. The tuned low-noise amplifier of claim 3 , wherein the first current source and the second current source are designed with similar scaling characteristics.

5. The tuned low-noise amplifier of claim 4 , wherein the third current source is a transistor with a scaling characteristic different than the scaling characteristics of the first current source and the second current source.

6. The tuned low noise amplifier of claim 5 , wherein the tuned low noise amplifier is used in a Global Positioning System (GPS) receiver.