System and method for analog-to-digital conversion
First Claim
1. A system for converting an analog signal to a digital signal, the system comprising:
- an amplifier;
a first circuit coupled to said amplifier, said first circuit having a signal range and having an input configured to receive a first signal, said first circuit configured to sample said first signal and further configured to produce the digital signal from the first signal via said amplifier; and
a second circuit having an input and first and second outputs, said input of said second circuit configured to receive the analog signal, said first output of said second circuit coupled to said input of said first circuit, said second output of said second circuit coupled to said amplifier, said second circuit configured to;
sample and scale the analog signal via said amplifier to produce said first signal within said signal range; and
cancel an offset of said first signal.
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Accused Products
Abstract
A system and method for converting an analog signal to a digital signal is provided including a first circuit (22) having a signal range and an input for receiving a first signal, and a second circuit (24) having an input receiving the analog signal and a first output coupled to the input of the first circuit. The first circuit (22) includes an amplifier (28). The first circuit (22) samples the first signal and produces the digital signal from the first signal using the amplifier. A second output of the second circuit (24) is coupled to the amplifier (28). The second circuit (24) samples and scales the analog signal via the amplifier (28) to produce the first signal within the signal range and cancels an offset of the first signal. The system and method reduce power consumption and save device area.
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Citations
20 Claims
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1. A system for converting an analog signal to a digital signal, the system comprising:
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an amplifier; a first circuit coupled to said amplifier, said first circuit having a signal range and having an input configured to receive a first signal, said first circuit configured to sample said first signal and further configured to produce the digital signal from the first signal via said amplifier; and a second circuit having an input and first and second outputs, said input of said second circuit configured to receive the analog signal, said first output of said second circuit coupled to said input of said first circuit, said second output of said second circuit coupled to said amplifier, said second circuit configured to; sample and scale the analog signal via said amplifier to produce said first signal within said signal range; and cancel an offset of said first signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for converting an analog signal to a digital signal, the system comprising:
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a first circuit having a first input configured to receive a first signal and having a second input configured to receive a reference signal, said first signal having a signal range, said first circuit comprising an amplifier having an input and an output, said first circuit configured to produce the digital signal from said first signal and said reference signal; a second circuit having first and second inputs and first and second outputs, said first input of said second circuit configured to couple to a first reference potential, said second input of said second circuit coupled to said output of said amplifier, said first output of said second circuit coupled to said second input of said first circuit, said second output of said second circuit coupled to said input of said amplifier, said second circuit configured to produce said reference signal via said amplifier from said first reference potential while canceling an offset of said reference signal; and a third circuit having an input and first and second outputs, said input of said third circuit configured to receive the analog signal, said first output of said third circuit coupled to said first input of said first circuit, said second output of said third circuit coupled to said input of said amplifier, said second circuit configured to sample and scale the analog signal via said amplifier to produce said first signal within said signal range while canceling an offset of said first signal. - View Dependent Claims (9, 10, 11, 12)
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13. A method for converting an analog signal to a digital signal, the method comprising the steps of:
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sampling and scaling the analog signal via an OPAMP to produce a first signal while canceling an offset of the first signal, the offset produced by the OPAMP; and determining one or more bits of the digital signal by deriving one or more sampled signals from the first signal while applying a corresponding gain via the OPAMP to each of the one or more sampled signals, the corresponding gain based on a corresponding bit of the one or more bits of the digital signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification