Method and system for implementing autonomous automatic gain control in a low noise broadband distribution amplifier
View Patent ↗Provided is a system for implementing gain control in an amplification module comprising a first stage amplifier having a number of first stage input and output ports. The first stage amplifier is configured to provide first stage amplification to a received input signal and produce from the amplified input signal a number of output signals. Also included are a number of second stage amplifiers, each having second stage input and output ports, the second stage input ports being respectively coupled to the first stage output ports and being configured to receive the number of output signals. A gain control device is coupled to at least one from the group including the first stage input ports, the first stage output ports, and the second stage output ports. The gain control device is also configured to control a gain of at least one of the first stage amplifier and one or more of the number of second stage amplifiers.
1. A method for controlling gain in an amplification system, comprising:
amplifying and combining two or more differential signals to produce a single differential signal therefrom;
producing a level indication signal representative of an output level of the differential signal;
producing one or more gain control signals in response to the level indication signal; and
adjusting the amplifying based upon the one or more gain control signals.
2. An apparatus for controlling gain in an amplifier including a (i) first stage amplification module having at least respective low and high gain amplifiers and (ii) at least one second stage amplification module having two or more second stage amplifiers configured to respectively receive inputs from the low and high gain amplifiers, and (iii) a summing mechanism configured to receive output signals produced by the second stage amplifiers, the apparatus comprising:
means for amplifying a received signal in the high gain amplifier to produce a first stage high gain signal;
means for amplifying an attenuated version of the received signal in the low gain amplifier to produce a first stage low gain signal;
means for receiving the high gain signal in a first of the two or more second stage amplifiers, the first of the second stage amplifiers producing a first output signal;
means for receiving the low gain signal in the other of the two or more second stage amplifiers, the second of the second stage amplifiers producing a second output signal; and
means for selectively combining the first and second output signals.