Systems and methods are provided for requesting a resource over at least one network. Two differential output terminals of the class-D amplifier are connected to two differential amplifiers of the second-order integrator to construct a second-order feedback loop for offering second order noise shaping, eliminating non-linear components in the class-D amplifier, and also enhancing signal to noise and distortion ratio. The receiver may select the number of decoding iterations based on at least one parameter to tradeoff between decoder throughput and link performance. The instrument includes a mechanism operatively connected to the first jaw for moving the first jaw between the open position and the closed position.