Method and system for providing a digital signal representing an analog signal
First Claim
1. A method for providing a digital output signal representing at least one analog input signal, comprising:
- (a) feeding an analog circuit with said at least one analog input signal and a plurality of discrete correction signals;
(b) said analog circuit providing analog monitoring outputs,wherein said at least one analog input signal and said discrete correction signals are jointly related by a relationship to said analog monitoring outputs, said relationship having an identification algorithm;
(c) receiving said analog monitoring outputs and a synchronization clock and implementing a negative feedback control loop by said feeding said analog circuit with said discrete correction signals, in order to keep at least one of said analog monitoring outputs to be within a previously defined constraint;
(d) identifying said relationship thereby creating an internal representation of said relationship;
(e) calculating said digital output signal by using a digital representation of said discrete correction signals and said internal representation, wherein said digital output signal represents said at least one analog input signal.
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Accused Products
Abstract
A method for providing a digital output signal (59) representing an analog input signal (54) in a system (50) including an analog circuit (51) and a control unit (52). Analog circuit (51) preferably features high bandwidth, high gain, and low current consumption. Analog circuit (51) is preferably implemented with low accuracy components. Control unit (52) keeps error outputs (55) of analog circuit (51) at a minimal value so that control unit (52) cancels analog input signal(54) by outputting discrete value signals (58) in a feedback loop as input (58) to analog circuit (51). A DSP (53) of system (50) is previously trained using known analog signals and a model relating inputs (54,58) to error outputs (55) of analog circuit (51) is previously known. During operation, a digital representation (57) of the discrete value signals (58) is fed to DSP (53) that reconstructs analog input signal (54) by knowing from the prior training the effect of control unit (52) and the model of analog circuit (51).
14 Citations
20 Claims
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1. A method for providing a digital output signal representing at least one analog input signal, comprising:
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(a) feeding an analog circuit with said at least one analog input signal and a plurality of discrete correction signals; (b) said analog circuit providing analog monitoring outputs, wherein said at least one analog input signal and said discrete correction signals are jointly related by a relationship to said analog monitoring outputs, said relationship having an identification algorithm; (c) receiving said analog monitoring outputs and a synchronization clock and implementing a negative feedback control loop by said feeding said analog circuit with said discrete correction signals, in order to keep at least one of said analog monitoring outputs to be within a previously defined constraint; (d) identifying said relationship thereby creating an internal representation of said relationship; (e) calculating said digital output signal by using a digital representation of said discrete correction signals and said internal representation, wherein said digital output signal represents said at least one analog input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A multi-stage analog signals sampler, wherein each stage of the multi-stage analog signals sampler includes:
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(a) an amplifier which amplifies an input analog signal, thereby producing an amplified analog signal; (b) a capacitor which at least approximately integrates said amplified analog signal, thereby producing an integrated signal; wherein a discharge mechanism discharges said capacitor; and (c) a mechanism which performs a comparison of said integrated signal with at least one threshold, and adds at least one previously defined correction to said amplified analog signal, and registers an output of said comparison in a digital logic.
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17. A multi-stage analog signals sampler, wherein each stage of said multi-stage analog signals sampler includes:
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(a) an amplifier amplifying an analog input signal, thereby producing an amplified analog signal; (b) a mechanism which renders said amplifier dependent on a synchronization clock; (c) a circuit which features a time constant on the order of a period of said synchronization clock, wherein said circuit modifies said amplified analog signal; (d) a mechanism which provides, at least one discrete correction signal to said analog input signal, by using information from at least one other said stage, wherein said at least one discrete correction signal performs a negative feedback control loop which controls said analog input signal; and (e) a mechanism which receives and stores, a digital representation of said at least one discrete correction signal. - View Dependent Claims (18, 19, 20)
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Specification