Analog comparator
AssigneesHitachi, Ltd., Nippon Telegraph & Telephone Public Corporation
InventorsKenji Fujikata, Norio Yokozawa, Akinori Shibayama
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Abstract
An analog comparator comprising a generator circuit which generates an input signal voltage having a certain slew rate, a setting circuit which sets a target or desired voltage, another setting circuit which sets a threshold voltage corresponding to the slew rate of the input signal voltage and an ambient temperature, and a comparison circuit which receives the input signal voltage, the target voltage and the threshold voltage and which delivers a coincidence timing signal upon detecting that the input signal voltage has reached a voltage shifting by the threshold voltage from the target voltage.
Claims8
An analog comparator comprising first means to generate an input signal having a certain slew rate, second means to set a desired target signal, third means to set a threshold signal corresponding at least to said slew rate, and fourth means to receive the signals from said first, second, and third means and to deliver a predetermined timing signal upon detecting that a level of said input signal has reached a signal level falling within a range established between the level of the target signal and the level of the threshold signal.
An analog comparator comprising first means to generate a signal representative of a slope of a desired ramp function, second means to generate a ramp function having a slope corresponding to the signal from said first means, third means to set a desired target signal, fourth means to set a threshold signal corresponding at least to the signal from said first means, and fifth means to receive the signals from said second, third and fourth means and to deliver a predetermined timing signal upon detecting that a signal level of said ramp function falls within a range established between the level of the target signal level and the level of the threshold signal.
Dependencies are inferred from the claim text.