High output amplifier for stable operation

A high output amplifier driving a load at its output terminal, comprising:

• a comparison amplifier having a first input, a second input, and an output, wherein a set voltage is applied to said first input, a voltage of said output terminal is applied to said second input, and said output is generated in response to a difference between the voltage applied to said first input and the voltage applied to said second input;
• a low-pass filtering device that receives the output of the comparison amplifier, and that performs low-pass filtering of the output of said comparison amplifier and outputs it,
• a conversion device that converts the output of said low-pass filtering device to complementary signals;
• and
• a push-pull output device having a through current on a predetermined level that supplies electrical current to said load and that is driven by said complementary signals,
• wherein said low-pass filtering device is selected to suppress an increase in said through current in response to a change in said load,
• wherein said comparison amplifier comprises:
• a buffer having a buffer output that receives the set voltage in the input of one side of said comparison amplifier;
• and
• a resistance element that connects said buffer output to the input of the other side of said comparison amplifier so that said output of the comparison amplifier can be obtained across said resistance element.

A method of supplying current to a device to be tested by an IC tester comprising:

• providing a high output amplifier comprising:
• a comparison amplifier having a first input, a second input, and an output, wherein a set voltage is applied to said first input, a voltage of said output terminal is applied to said second input, and said output is generated in response to a difference between the voltage applied to said first input and the voltage applied to said second input;
• a low-pass filtering device that receives the output of the comparison amplifier, and that performs low-pass filtering of the output of said comparison amplifier and outputs it,
• a conversion device that converts the output of said low-pass filtering device to complementary signals;
• and
• a push-pull output device having a through current on a predetermined level that supplies electrical current to said load and that is driven by said complementary signals,
• wherein said low-pass filtering device is selected to suppress an increase in said through current in response to a change in said load;
• wherein said comparison amplifier is a complementary amplifier that generates complementary outputs, and further wherein said low-pass filtering device receives, combines and low-pass-filters said complementary outputs of said comparison amplifier, and
• coupling said push-pull output stage to said device to be tested by the IC tester.