Programmable amplifiers with positive and negative hysteresis
First Claim
1. A two stage amplifying system comprisingfirst and second hysteretic amplifiers coupled to receive first and second differential input voltages;
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Abstract
Programmable dynamic amplifiers with hysteresis are provided. The hysteretic amplifiers have a first input voltage threshold when the output voltage is at a high voltage and a second input voltage threshold when the output voltage is at a low voltage. A multiplexer controls the hysteretic threshold voltages in response to the output signal of the amplifier. The hysteretic amplifiers can be programmed to have positive or negative hysteresis. When the amplifier is programmed with positive hysteresis, the output voltage transitions after the input voltages have both reached a common voltage value. When the amplifier is programmed with negative hysteresis, the output voltage transitions before the input voltages have both reached a common voltage value.
14 Citations
19 Claims
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1. A two stage amplifying system comprising
first and second hysteretic amplifiers coupled to receive first and second differential input voltages; - and
a third hysteretic amplifier having inputs coupled to outputs of the first and the second amplifiers, wherein the first and the second hysteretic amplifiers generate two positive hysteretic thresholds in response to first and second control signals, and two negative hysteretic thresholds in response to the first and the second control signals, and the third hysteretic amplifier generates two positive hysteretic thresholds in response to third and fourth control signals, and two negative hysteretic thresholds in response to the third and the fourth control signals.
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2. An integrated circuit including an input amplifier comprising:
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a first differential amplifier coupled to receive a first differential signal and having a first positive hysteresis or a first negative hysteresis depending on a state of a first control signal; a second differential amplifier coupled to receive the first differential signal and having the first positive hysteresis or the first negative hysteresis depending on the state of the first control signal; and a third differential amplifier coupled to receive an output from the first differential amplifier and an output from the second differential amplifier, and having a second positive hysteresis or a second negative hysteresis depending on a state of a second control signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. An integrated circuit including an input amplifier comprising:
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a first differential amplifier coupled to receive a first differential signal and having no hysteresis, a first positive hysteresis, or a first negative hysteresis depending on a state of a first control signal and a state of a second control signal; a second differential amplifier coupled to receive the first differential signal and having no hysteresis, the first positive hysteresis, or the first negative hysteresis depending on the state of the first control signal and the state of the second control signal; a third differential amplifier coupled to receive an output from the first differential amplifier and an output from the second differential amplifier, and having no hysteresis, a second positive hysteresis, or a second negative hysteresis depending on a state of a third control signal and a state of a fourth control signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification