Abstract: A folding display rack includes a corner connection piece and an intermediate connection piece, where the corner connection piece includes an upper corner connection piece and a lower corner connection piece; two ends of the long frames are connected to an upper short frame and a lower short frame respectively through the upper corner connection piece and the lower corner connection piece; the intermediate connection piece is located at the middle position of each of the long frames and divides the long frame into two parts; the long frame is can be folded in a direction from the middle to the inner side of the display frame through the intermediate connection piece; and the long frames on two sides can be folded in half from the middle through the corner connection piece and then are staggered, folded and stored on the short frame on the lower side.

Abstract: A folding display rack includes a corner connection piece and an intermediate connection piece, where the corner connection piece includes an upper corner connection piece and a lower corner connection piece; two ends of the long frames are connected to an upper short frame and a lower short frame respectively through the upper corner connection piece and the lower corner connection piece; the intermediate connection piece is located at the middle position of each of the long frames and divides the long frame into two parts; the long frame is can be folded in a direction from the middle to the inner side of the display frame through the intermediate connection piece; and the long frames on two sides can be folded in half from the middle through the corner connection piece and then are staggered, folded and stored on the short frame on the lower side.

Abstract: A method of testing an analog and/or mixed-signal circuit can be used in either a production or a built-in self test environment. The method includes generating an excitation signal for testing by using dynamic element matching for performance enhancement of the test signal generator that applies an excitation, and/or by measuring an output of the DUT using dynamic element matching for performance enhancement of an output measurement device. Signal generators and circuits using aspects of the method are also discussed.

Abstract: A method of testing an analog and/or mixed-signal circuit can be used in either a production or a built-in self test environment. The method includes generating an excitation signal for testing by using dynamic element matching for performance enhancement of the test signal generator that applies an excitation, and/or by measuring an output of the DUT using dynamic element matching for performance enhancement of an output measurement device. Signal generators and circuits using aspects of the method are also discussed.