Abstract: The present invention provides an apparatus for manufacturing a secondary battery, which includes a pressing part configured to press a stack in which electrodes and separators are alternately disposed, wherein the pressing part includes: a main pressing part configured to press an entire surface of the stack; and a sub pressing part including a drum part configured to press a partial surface of the stack, on which an edge part of an electrode active material layer provided on each of the electrodes is disposed, on the entire surface, wherein the drum part includes: a body part having a rotational shaft; and an elastic part provided on an outer circumferential surface of the body part and configured to press the partial surface of the stack.

Abstract: A power amplifier includes a clamping circuit configured to provide a clamped voltage from a power supply; an amplifier pair having first inputs coupled to the clamping circuit, second inputs and an output for providing an amplified signal; and a biasing circuit coupled between the clamping circuit and the second inputs. The biasing circuit is configured to adjust input bias voltages of the amplifier pair such that the output of the amplifier pair varies proportionally to a change of the power supply.

Abstract: A power amplifier includes a clamping circuit configured to provide a clamped voltage from a power supply; an amplifier pair having first inputs coupled to the clamping circuit, second inputs and an output for providing an amplified signal; and a biasing circuit coupled between the clamping circuit and the second inputs. The biasing circuit is configured to adjust input bias voltages of the amplifier pair such that the bias voltage of the output of the amplifier pair varies proportionally to a change of the power supply.