Low power telemetry system and method
First Claim
1. A channel in a telemetry system, comprising:
- a sample-and-hold circuit for holding a sample of a signal;
a variable resistor circuit, communicatively coupled to the sample-and-hold circuit, the variable resistor circuit for presenting a variable impedance to one or more signal lines during a time period designated for the channel, wherein the variable impedance is representative of the sample held by the sample-and-hold circuit; and
a control element for controlling the variable resistor circuit to present to the one or more signal lines an open circuit equivalent impedance during times other than the time period designated for the channel.
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Abstract
A channel in a telemetry system is described. The channel includes a sample-and-hold circuit, a variable resistor circuit, and a control element. The sample-and-hold circuit is configured to hold a sample of a signal. The variable resistor circuit is communicatively coupled to the sample-and-hold circuit, and is configured to present a variable impedance to one or more signal lines during a time period designated for the channel. The variable impedance is representative of the sample held by the sample-and-hold circuit. The control element is configured to control the variable resistor circuit to present to the one or more signal lines an open circuit equivalent impedance during times other than the time period designated for the channel.
29 Citations
18 Claims
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1. A channel in a telemetry system, comprising:
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a sample-and-hold circuit for holding a sample of a signal; a variable resistor circuit, communicatively coupled to the sample-and-hold circuit, the variable resistor circuit for presenting a variable impedance to one or more signal lines during a time period designated for the channel, wherein the variable impedance is representative of the sample held by the sample-and-hold circuit; and a control element for controlling the variable resistor circuit to present to the one or more signal lines an open circuit equivalent impedance during times other than the time period designated for the channel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A channel in a telemetry system, comprising:
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a sample-and-hold circuit configured to hold a sample of a signal; a variable resistor circuit, communicatively coupled to the sample-and-hold circuit, the variable resistor circuit configured to present a variable impedance to one or more signal lines during a time period designated for the channel, wherein the variable impedance is representative of the sample held by the sample-and-hold circuit; and a programmable control element configured to control the variable resistor circuit to present to the one or more signal lines an open circuit equivalent impedance during times other than the time period designated for the channel. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A channel in a telemetry system, comprising:
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a sample-and-hold circuit for holding a sample of a signal; a variable resistor circuit, communicatively coupled to the sample-and-hold circuit, the variable resistor circuit for presenting a variable impedance to one or more signal lines during a time period designated for the channel, wherein the variable impedance is representative of the sample held by the sample-and-hold circuit; a programmable control element for controlling the variable resistor circuit to present to the one or more signal lines an open circuit equivalent impedance during times other than the time period designated for the channel; and a switch, communicatively coupled to the sample-and-hold circuit, the variable resistor circuit and the programmable control element, wherein the switch decouples the sample-and-hold circuit from the variable resistor circuit during times other than the time period designated for the channel. - View Dependent Claims (15, 16, 17, 18)
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Specification