Agc circuit arrangement for a tuner
OwnerAaron Bouillet, Matthew Mayerinventors
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Abstract
A method and apparatus for generating the adaptive gain control signals in a communications receiver is disclosed. The present invention can be used with existing two stage gain architectures, and overcomes many undesirable characteristics of the previous mechanism. An apparatus is presented wherein each of a plurality of RF AGC gain controllable amplifiers are individually controlled by individual AGC control signals generated by an AGC controller so that the level of the output signal from each of the RF AGC gain controllable amplifiers is individually optimized for tuner performance.
Claims19
An apparatus comprising:
- an input receiving a first signal;
- a first signal path for integrating the difference between the first signal and a first reference level to produce a first control signal;
- and
- a second signal path for integrating the difference between the first control signal and a second reference level to produce a second control signal.
A method comprising to steps of:
- determining a first control value by integrating the difference between a signal level and a first reference level;
- and
- determining a second control value by integrating the difference between the first control signal and a second reference level.
A gain control method comprising to steps of:
- converting an analog signal to a digital signal;
- integrating the difference between a predetermined characteristic of said digital signal and a first reference level to produce a first control signal;
- and
- integrating the difference between a predetermined characteristic of said first control signal and a second reference level to produce a second control signal.
Dependencies are inferred from the claim text.