Interpolation amplifier and source driver comprising the same

An interpolation amplifier for outputting a voltage corresponding to an input signal with a plurality of bits, the interpolation amplifier comprising:

• an input stage including a plurality of unit modules configured to receive one bit of the plurality of bits of the input signal and generate a current corresponding to the bit;
• a load stage configured to generate a voltage corresponding to the current output by the input stage;
• and
• an output stage configured to output the voltage generated by the load stage,
• wherein an output voltage generated in the output stage is fed back and input to the input stage,
• the input stage includes a number of unit modules corresponding to the number of bits of the input signal,
• each unit module of the plurality of unit modules included in the input stage includes a connection source module comprising:
• a first differential pair including transistors of a first conductive type;
• and
• a second differential pair including transistors of a second conductive type,
• sources of the transistors included in the first differential pairs included in the plurality of unit modules are all electrically connected to form a single electrical node,
• sources of the transistors included in the second differential pairs included in the plurality of unit modules are all electrically connected to form a single electrical node,
• each unit module of the plurality of unit modules included in the input stage further includes:
• a first current source configured to provide a bias current to the first differential pair;
• and
• a second current source configured to provide a bias current to the second differential pair, and
• the plurality of unit modules further include separate source modules,
• between the plurality of unit modules, sources of the transistors included in the first differential pairs are not electrically connected, and
• between the plurality of unit modules, sources of the transistors included in the second differential pairs are not electrically connected.

A source driver for driving a plurality of pixels included in a display panel, the source driver comprising:

• an interpolation amplifier configured to output a voltage corresponding to an input signal with a plurality of bits,
• wherein the interpolation amplifier includes an input stage including a plurality of unit modules configured to receive one bit of the plurality of bits of the input signal and generate a current corresponding to the bit, a load stage configured to generate a voltage corresponding to the current output by the input stage, and an output stage configured to output the voltage generated by the load stage,
• an output voltage generated in the output stage is fed back and input to the input stage,
• the input stage includes a number of unit modules corresponding to the number of bits of the input signal,
• each unit module of the plurality of unit modules included in the input stage includes:
• a first differential pair including transistors of a first conductive type;
• and
• a second differential pair including transistors of a second conductive type,
• sources of the transistors included in the first differential pairs included in the plurality of unit modules are all electrically connected to form a single electrical node,
• sources of the transistors included in the second differential pairs included in the plurality of unit modules are all electrically connected to form a single electrical node,
• each unit module of the plurality of unit modules included in the input stage further includes:
• a first current source configured to provide a bias current to the first differential pair;
• and
• a second current source configured to provide a bias current to the second differential pair, and
• the plurality of unit modules further include separate source modules,
• between the plurality of unit modules, sources of the transistors included in the first differential pairs are not electrically connected, and
• between the plurality of unit modules, sources of the transistors included in the second differential pairs are not electrically connected.