The invention relates to a system for detecting motion of a body, said body comprising a first diffraction pattern and a second diffraction pattern with a predetermined orientation relative to said first diffraction pattern. In one example, the circuit includes a clocked gate for producing an output in response to an input when a clock is received, and a clock control circuit to receive the clock and the input, to determine whether the output will be changed by the input and to provide the clock to the clocked gate if the output will be changed by the input. The first transport block includes a plurality of code blocks, all modulation symbols of at least one code block belongs to a single part, and M1 is a positive integer value greater than one. First and second field effect transistors are respectively coupled in parallel with the first and second bipolar junction transistors.