Time-multiplexed residue amplifier
First Claim
1. A system including a circuit receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal, the circuit comprising:
- a low accuracy amplifier and a high accuracy attenuator,during one time period the first input signal and the low accuracy amplifier are selectively coupled to produce the first output signal and during another time period the second input signal, the low accuracy amplifier and the high accuracy attenuator are selectively coupled to produce the second output signal;
wherein the circuit maintains a highly accurate ratio between the output ratio and the input ratio.
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Accused Products
Abstract
A system is configured and a method is provided for receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal. The system is constructed and the method is provided for alternately operating in at least two time periods, wherein in one time period the first input signal, a low accuracy amplifier, and the first output signal are selectively coupled, and in another time period the input signal, the low accuracy amplifier, a high accuracy attenuator, and the second output signal are selectively coupled so as to maintain the output ratio proportional to the input ratio.
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Citations
82 Claims
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1. A system including a circuit receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal, the circuit comprising:
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a low accuracy amplifier and a high accuracy attenuator, during one time period the first input signal and the low accuracy amplifier are selectively coupled to produce the first output signal and during another time period the second input signal, the low accuracy amplifier and the high accuracy attenuator are selectively coupled to produce the second output signal; wherein the circuit maintains a highly accurate ratio between the output ratio and the input ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An analog to digital conversion system including a multi-stage circuit comprising:
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at least two stages each including a first signal path constructed to conduct at least a portion of an analog input signal, and a second signal path constructed to conduct at least a portion of an analog reference signal; at least one amplifier having a gain, an input and an output; and a time multiplexer constructed to operate alternately in at least two time periods, wherein (a) during a first time period the first signal path of a first stage is connected to the input of the amplifier and the output of the amplifier is connected to the first signal path of a second stage, and (b) during a second time period the second signal path of a first stage is connected to the input of the amplifier and the output of the amplifier is connected to the second signal path of the second stage, so that the analog input signal and analog reference signal are each amplified by the same gain as each is respectively transmitted from the first to the second stages during the first and second time periods. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A multi-stage analog to digital converter for converting an analog input signal to a digital output signal, comprising:
a plurality of stages constructed and arranged so as to quantize the analog input signal by comparing the input signal in the first stage and a residue signal in each subsequent stage with a reference signal provided to each stage, and an interstage amplifier disposed between each set of interconnected stages and operative so as to apply the same amplifier gain to the residue and reference signals provided to the subsequent stage. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal, the method comprising:
alternately operating in at least two time periods, wherein in one time period the first input signal, a low accuracy amplifier, and the first output signal are selectively coupled, and in another time period the input signal, the low accuracy amplifier, a high accuracy attenuator, and the second output signal are selectively coupled so as to maintain the output ratio proportional to the input ratio. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A method of converting an analog input signal to a digital output signal, comprising:
operating a time multiplexer alternately in at least two time periods, wherein (a) during a first time period connecting a first signal path of a first stage carrying an analog input signal to an input of an amplifier having a gain and connecting the output of the amplifier to a first signal path of a second stage, and (b) during a second time period connecting a second signal path of the first stage carrying an analog reference signal to the input of the amplifier and connecting the output of the amplifier to a second signal path of the second stage; wherein the analog input signal and analog reference signal are each amplified by the same gain as each is respectively transmitted from the first to the second stages during the first and second time periods. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. A method of converting an analog input signal to a digital output signal using a plurality of stages and an interstage amplifier disposed between each successive stage, comprising:
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quantizing the analog input signal by comparing the input signal in the first stage and a residue signal in each subsequent stage with a reference signal provided to each stage, and applying the same amplifier gain to the residue and reference signals provided to the subsequent stage. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79, 80, 81, 82)
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Specification