Method and apparatus for reducing transmitter AC-coupling droop
First Claim
1. A system for reducing voltage droop, the system comprising:
- a driver configured toamplify a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, andoutput the amplified signal on the communication channel;
an isolation device configured to isolate the driver from the communication channel;
a resistance configured to match the characteristic impedance of the communication channel, the resistance being connected between the driver and the isolation device; and
a voltage compensator, whereinan electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance of the communication channel, and ii) based on a desired frequency response to reduce the voltage droop, andthe voltage compensator is connected to the resistance between the driver and the isolation device.
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Abstract
As part of a transmitter and receiver system a droop compensator is provided between the channel isolation device and the driver system to compensate for reduced transition densities. The droop compensator is configured to improve power transfer to the channel in response to reductions in transition density without affecting power transfer during periods of high transition density. The droop compensator creates an impedance mismatch between the matching circuit and driver in relation to the line impedance. The droop compensator may comprise passive elements, such as capacitors, inductors, or resistor, or active elements including transistors or power control modules. The droop compensator may be configured to operate with transformer line couplers or capacitor line couplers, and either current drivers or voltage drivers.
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Citations
20 Claims
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1. A system for reducing voltage droop, the system comprising:
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a driver configured to amplify a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and output the amplified signal on the communication channel; an isolation device configured to isolate the driver from the communication channel; a resistance configured to match the characteristic impedance of the communication channel, the resistance being connected between the driver and the isolation device; and a voltage compensator, wherein an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance of the communication channel, and ii) based on a desired frequency response to reduce the voltage droop, and the voltage compensator is connected to the resistance between the driver and the isolation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for reducing voltage droop, the system comprising:
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a driver configured to amplify a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and output the amplified signal on the communication channel; an isolation device configured to isolate the driver from the communication channel; a resistance configured to match the characteristic impedance of the communication channel, the resistance being connected between the driver and the isolation device; and a voltage compensator, wherein an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance of the communication channel, and ii) based on a desired frequency response to reduce the voltage droop, the voltage compensator is connected to the resistance between the driver and the isolation device, and the communication channel includes a first signal line and a second signal line, and wherein the resistance comprises a first resistor connected i) between the first signal line and the second signal line, and ii) between the driver and the isolation device, and a second resistor connected in series with the first resistor between the first signal line and the second signal line, and the voltage compensator comprises a first capacitor connected in series with the first resistor and the second resistor, and a second capacitor connected in series with the first capacitor, the first resistor, and the second resistor.
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10. A system for reducing voltage droop, the system comprising:
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a driver configured to amplify a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and output the amplified signal on the communication channel; an isolation device configured to isolate the driver from the communication channel; a resistance configured to match the characteristic impedance of the communication channel, the resistance being connected between the driver and the isolation device; and a voltage compensator, wherein an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance of the communication channel, and ii) based on a desired frequency response to reduce the voltage droop, the voltage compensator is connected to the resistance between the driver and the isolation device, and the communication channel includes a first signal line and a second signal line, and wherein the resistance comprises a first resistor connected i) between the first signal line and the second signal line, and ii) between the driver and the isolation device, and the voltage compensator comprises an inductor connected i) in parallel to the first resistor, ii) between the first signal line and the second signal line, and iii) between the first resistor and the isolation device.
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11. A method for reducing voltage droop, the method comprising:
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using a driver, amplifying a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and outputting the signal on the communication channel; and isolating the driver from the communication channel using an isolation device, wherein a resistance is connected between the driver and the isolation device, the resistance being configured to match the characteristic impedance of the communication channel, and wherein a voltage compensator is connected to the resistance between the driver and the isolation device, and an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance, and ii) based on a desired frequency response to reduce the voltage droop. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for reducing voltage droop, the method comprising:
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using a driver, amplifying a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and outputting the signal on the communication channel; and isolating the driver from the communication channel using an isolation device, wherein a resistance is connected between the driver and the isolation device, the resistance being configured to match the characteristic impedance of the communication channel, wherein a voltage compensator is connected to the resistance between the driver and the isolation device, and an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance, and ii) based on a desired frequency response to reduce the voltage droop, and the communication channel includes a first signal line and a second signal line, and wherein; the resistance comprises a first resistor connected i) between the first signal line and the second signal line, and ii) between the driver and the isolation device, and a second resistor connected in series with the first resistor between the first signal line and the second signal line, and the voltage compensator comprises a first capacitor connected in series with the first resistor and the second resistor, and a second capacitor connected in series with the first capacitor, the first resistor, and the second resistor.
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20. A method for reducing voltage droop, the method comprising:
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using a driver, amplifying a signal to be transmitted over a communication channel, the communication channel having a characteristic impedance, and outputting the signal on the communication channel; and isolating the driver from the communication channel using an isolation device, wherein a resistance is connected between the driver and the isolation device, the resistance being configured to match the characteristic impedance of the communication channel, wherein a voltage compensator is connected to the resistance between the driver and the isolation device, and an electrical characteristic of the voltage compensator is selected i) to create an impedance mismatch with respect to the characteristic impedance, and ii) based on a desired frequency response to reduce the voltage droop, and the communication channel includes a first signal line and a second signal line, and wherein the resistance comprises a first resistor connected i) between the first signal line and the second signal line, and ii) between the driver and the isolation device, and the voltage compensator comprises an inductor connected i) in parallel to the first resistor, ii) between the first signal line and the second signal line, and iii) between the first resistor and the isolation device.
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Specification