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US 6,677,862 B1Granted
Transmitter tolerant to crystal variations
AssigneeSchlumbergerSema Inc.
InventorsThomas Sean Houlihane, Andrew Gordon Summers
Life of this patent
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Abstract
A transmitter to transmit data from an end-point includes a reference oscillator; a low pass filter coupled to the reference oscillator; a modulation filter to provide an over-sampled modulated signal; a synthesizer coupled to the low pass filter and the modulation filter; and a sine wave generator coupled to the synthesizer.
Claims20
A transmitter to transmit data from an end-point, comprising:
- a reference oscillator;
- a low pass filter coupled to the reference oscillator;
- a modulation filter to provide an over-sampled modulated signal;
- a synthesizer coupled to the low pass filter and the modulation filter;
- and
- a sine wave generator coupled to the synthesizer.
3 more elements
A remote data collection system for collecting usage data from an endpoint, comprising:
- a monitoring module coupled to the endpoint, the monitoring module having a wireless transmitter to transmit the usage data, the wireless transmitter including:
- a reference oscillator;
- a low pass filter coupled to the reference oscillator;
- a modulation filter to provide an over-sampled modulated signal;
- a synthesizer coupled to the low pass filter and the modulation filter;
- a sine wave generator coupled to the synthesizer;
- and
- an antenna coupled to the sine wave generator;
- and
- a data communication network coupled to the transmitter to communicate the usage data from the endpoint to a database.
7 more elements
Dependencies are inferred from the claim text.