Abstract: A position servo system is described for positioning a member mounted on a spring. The spring provides a force opposing the motion of the member from an initial position. A position actuator, for example a motor, applies a force in response to a position request signal for moving the member to a desired position. A portion of the position feedback signal is applied from a position sensor to the motor as a positive feedback signal to compensate for the force of the spring. A steady state position error of the servo system is thereby substantially reduced to zero. A circuit and method for calibrating the positive feedback signal are also described.

Abstract: A parallel-to-serial converter for synchronously converting parallel data transferred by one or more parallel data channels into corresponding serial data streams having respectively programmable frequency ratios of the serial output data bits.

Abstract: A circuit and method for providing two or more synchronous clock signals whose respective frequency ratios can be readily changed with respect to a master clock signal frequency.

Abstract: A serial-to-parallel converter receives serial data bits forming serial input words and serial word synchronizing pulses indicating the length of the serial input words. A parallel clock signal is generated synchronously with an integer number of serial word synchronizing pulses. The input data is sequentially supplied via a direct data path to an output storage means. A synchronous counter counts the received consecutive serial data bits and in response to each count a decoder sequentially enables one respective output storage means to store therein one data bit. The stored data is released simultaneously from the output storage means in form of a parallel word in response to the parallel clock signal. Means for changing the length of the parallel output word are provided.

Abstract: A compensation circuit for overshoot, undershoot and delay occurring in response to sudden D. C. level changes in signals received by reactive filters. A D. C. level change, represented by an input signal step applied to the reactive filter is detected by the compensation circuit. The compensation circuit responsively provides a compensation D. C. signal step of a predetermined magnitude and polarity with respect to the input signal step. The compensation step is applied by the circuit to the signal return line of the reactive filter, simultaneously with the input signal step received by the filter to maintain a substantially constant D. C. signal level with respect to the reactive filter elements. The reactive filter elements are thus prevented from charging and discharging in response to the input signal step and filter delay is eliminated.