Reference current generating circuit and memory device

A reference current generating circuit, comprising:

• a positive temperature coefficient current source configured to generate a first current, a value of which increases with an increase of an ambient temperature thereof;
• a negative temperature coefficient current source configured to generate a second current, a value of which decreases with the increase of the ambient temperature thereof;
• a first current adjustment circuit configured to adjust the first current in accordance with a first adjustment setting signal, to thereby generate a first positive temperature characteristic current;
• a second current adjustment circuit configured to adjust the second current in accordance with a second adjustment setting signal, to thereby generate a first negative temperature characteristic current;
• a third current adjustment circuit configured to adjust the first current in accordance with a third adjustment setting signal, to thereby generate a second positive temperature characteristic current;
• a fourth current adjustment circuit configured to adjust the second current in accordance with a fourth adjustment setting signal, to thereby generate a second negative temperature characteristic current;
• a first current amplifier configured to amplify a combined current of the first positive temperature characteristic current and the first negative temperature characteristic current, to thereby generate a first reference current;
• and
• a second current amplifier configured to amplify a combined current of the second positive temperature characteristic current and the second negative temperature characteristic current, to thereby generate a second reference current.

A memory device, comprising:

• a memory cell array including a plurality of memory cells;
• a reference current generating circuit configured to generate a reference current, the reference current generating circuit including:
• a positive temperature coefficient current source configured to generate a plurality of first currents, a value of each of which increases with an increase of an ambient temperature thereof;
• a negative temperature coefficient current source configured to generate a plurality of second currents, a value of which decreases with the increase of the ambient temperature thereof;
• a first current adjustment circuit configured to generate a positive temperature characteristic current by combining the first currents based on a first adjustment setting signal;
• a second current adjustment circuit configured to generate a negative temperature characteristic current by combining the second currents based on a second adjustment setting signal;
• and
• a current amplifier configured to amplify a combined current of the positive temperature characteristic current and the negative temperature characteristic current, to thereby generate a reference current.