Boosting xDSL amplifier supply power on-demand
Systems and methods for increasing amplifier supply power on demand for a plurality of xDSL signals is provided. In an embodiment, circuitry may be used to detect the signal or signals having the highest voltage. In different embodiments, the signal(s) with the highest absolute voltage or highest combined voltage between complementary signal pairs may be compared to a threshold voltage, such as an existing amplifier supply voltage. In different embodiments, when these highest voltage(s) exceed the threshold voltage, the corresponding amplifier supply voltages may be increased to meet the increased amplification demand. In some embodiments when these highest voltage(s) do not exceed the threshold voltage, the amplifier supply voltage may not be increased and the existing amplifier supply voltage may be used to amplify the xDSL signals.
1. A multichannel amplifier system, comprising:
a plurality of amplifiers, each having an input for a respective input channel and having a power supply input,
a charge pump system coupled to the power supply inputs of the amplifiers,
a control system for the charge pump system, comprising logic to identify the input channel having a signal value with a highest absolute voltage amplitude from among a subset of the input channels and to deliver the identified signal value of the input channel in each subset to the charge pump system as a control signal to the respective amplifiers when the identified signal value exceeds a threshold, and
a gain block for amplifying the signal value of the identified input channel.
2. The system of claim 1 , where the logic comprises an absolute value circuit and a maximum out block.
3. The system of claim 1 , where the subset includes every input channel.
4. The system of claim 1 , further comprising two subsets of input channels, a first subset comprising a first set of signals in each differential signal pair and a second subset comprising the complementary signal in each differential signal pair.
5. The system of claim 4 , where the first set of signals is a set of high signals in each differential signal pair and the second set of signals is the complementary set of low signals in each different signal pair.
6. The system of claim 1 , further comprising a controller connected to the control system.
7. The system of claim 6 , where the controller is further connected to each differential signal input.
8. The system of claim 7 , where the controller further comprises a configuration setting input connected to at least one of the configuration ports.
9. The system of claim 8 , where the configuration setting input is at least one of: a hardwired input, a DIP switch, and a printed circuit board connection.
10. The system of claim 8 , where the configuration setting input is a programmable register.
11. The system of claim 1 where the gain block comprises a non-rail-to-rail amplifier.
12. The system of claim 1 , where at least one amplifier is a non-rail-to-rail amplifier.
13. The system of claim 1 , further comprising an amplifier interface comprising an interface for coupling:
each input signal to the corresponding amplifier input channel and
each highest absolute voltage amplitude to the power supply inputs of the respective amplifiers.
14. The system of claim 1 , further comprising a communications device, the communications device comprising the plurality of amplifiers, the charge pump system, and the control system.
15. The system of claim 1 , where the communications device is at least one of: a xDSL modem, a xDSL access multiplexer, xDSL router, xDSL gateway, or a xDSL terminal adapter.
16. A method comprising:
sending each input channel in a multi-channel xDSL input signal to an input of a distinct amplifier;
identifying the input channel having a highest absolute voltage amplitude;
adding a voltage gain to the identified input channel;
determining whether a voltage of the identified input channel exceeds a threshold;
when the voltage exceeds the threshold, supplying each amplifier with a supply power proportional to the voltage of the identified highest amplitude input channel and exceeding a default supply power; and
otherwise, supplying each amplifier with the default supply power.
17. The method of claim 16 , further comprising:
identifying a subset of input channels;
identifying the input channel having the highest absolute voltage amplitude in the subset;
when the voltage of the identified input channel in the subset exceeds the threshold, supplying each amplifier in the subset with the supply power exceeding the default supply power; and
otherwise, supplying each amplifier in the subset with the default supply power.
18. The method of claim 17 , further comprising two subsets of input channels, a first subset comprising a first set of signals in each differential signal pair and a second subset comprising the complementary signal in each differential signal pair.
19. The method of claim 16 , where the threshold is the default supply power and the supply power exceeding the default supply power is the voltage of the identified input channel including the added gain.
20. The method of claim 16 , further comprising using a controller to adjust at least one of: the input channel and the supply power.
21. The method of claim 16 , where the controller dynamically adjusts the at least one of the input channel and the supply power through at least one of: a printed circuit board connection and a programmable register.
22. The method of claim 17 , where at least one input channel is amplified using a non-rail-to-rail amplifier.