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US 4,358,752 AGranted
Analog-to-digital converter
AssigneeFujitsu Limited
InventorsHaruo Tamada, Osamu Kudo
Life of this patent
Estimating the term…
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AssigneeFujitsu Limited
InventorsHaruo Tamada, Osamu Kudo
Estimating the term…
A differential amplifier, which is associated with a digital-to-analog converter and a register and serves as an element of an analog-to-digital converter, having the offset input voltage characteristic determined by selecting, for example, the ratio of the emitter areas of a first pair of transistors so that no offset characteristic is required for the digital-to-analog converter associated with the differential amplifier. The offset input voltage can also be determined by selecting the ratio of the emitter areas of a second pair of transistors each one of the second pair of transistors connected to a different one of the first transistors and each one of the second pair of transistors having a current source of the same magnitude. The offset characteristic can also be determined by selecting unequal magnitudes of the current sources connected to the second pair of transistors when the ratio of the second pair of transistor emitter areas are equal. The offset characteristic can also be selected by selecting both the second pair of transistors emitter areas ratios and the second transistor current source magnitudes as not equal or by selecting any combination of the above current magnitudes or emitter area ratios.
An analog-to-digital converter, operatively connectable to receive an analog input signal, comprising:
An analog-to-digital converter, operatively connectable to receive an analog input signal, comprising:
An analog-to-digital converter, operatively connectable to receive an analog input signal and operatively connected to first and second reference voltages, comprising:
An analog-to-digital converter, operatively connected to first and second reference voltages and operatively connectable to receive an analog input signal, comprising:
An analog-to-digital converter, operatively connected to first and second reference voltages and operatively connectable to receive an analog input signal, comprising:
An analog-to-digital converter, operatively connected to first and second reference voltages and operatively connectable to receive an analog input signal, comprising:
Dependencies are inferred from the claim text.