Method and apparatus for sampling of electrical signals
AssigneeTelefonaktiebolaget LM Ericsson
InventorErik R. Arvidsson
Life of this patent
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Abstract
Method and apparatus for sampling an electrical signal in order to obtain at least one signal weighted together from two or more samples, in which in a first step the electrical signal is connected to a number of capacitors connected in parallel. In a second step, one capacitor is disconnected from the electrical signal at each time of sampling and in a third step, when the sampling is completed, the capacitors are connected together. In this manner, one or more signals weighted together are generated in dependence of the charge of the capacitors when they are disconnected from the electrical signal and of the capacitances of the capacitors.
Claims16
A method of sampling an electrical signal and generating a combined signal from at least two samples of the electrical signal, comprising the steps of:
- connecting the electrical signal to a plurality of capacitors connected in parallel;
- at each of a plurality of sampling times, disconnecting a capacitor from the electrical signal, thereby generating the samples of the electrical signal;
- and
- when sampling is completed, reconnecting the disconnected capacitors together, thereby generating the combined signal from the samples, the samples being weighted in dependence on the charges on the capacitors when they were disconnected from the electrical signal and on the capacitances of the capacitors.
An apparatus for sampling an electrical signal and generating a combined signal from at least two samples of the electrical signal, comprising:
- a plurality of capacitors, and
- means, connected to the capacitors, for switchably connecting the capacitors,
- wherein, at a first stage, the switching means connects the capacitors in parallel to the electrical signal;
- at a second stage, the switching means disconnects, at each of a plurality of sampling times, a respective one of the plurality of capacitors from the electrical signal, thereby forming the samples;
- and
- at a third stage, after the sampling times, the switching means reconnects the disconnected capacitors together to form the combined signal in dependence on the charges of the capacitors when they were disconnected from the electrical signal and on the capacitances of the capacitors.
Dependencies are inferred from the claim text.