Abstract:
A DAC (1) has a switched element capacitor (7, Cr) to which charge is delivered via switches (6, S1/S2) depending on required analog voltage level (Vref1, Vref2). An output switch (S3) is closed and a ground switch (S4) is opened to deliver charge to the output according to received bi-level digital inputs (+1, −1). The control block (2) has a memory and determines an inactive output level if there is an input digital transition from +1 to −1 or from −1 to +1. For the inactive level S3 is kept open and S4 is kept closed. Thus, for every clock cycle with one of these transitions there is no charge transfer and hence no thermal noise. Overall noise is therefore considerably reduced.
Abstract:
An acquisition and averaging circuit is provided in which, during a sampling phase capacitors in sample blocks 4 and 6 are sequentially connected to the input signal to sample it and are then isolated so as to hold the sample. The capacitors are then connected to a combining/averaging arrangement such that an average of the sample values is formed.
Abstract:
Embodiments of the present invention provide a motor-driven mechanical system with a detection system to measure properties of a back channel and derive oscillatory characteristics of the mechanical system. Uses of the detection system may include calculating the resonant frequency of the mechanical system and a threshold drive DTH required to move the mechanical system from the starting mechanical stop position. System manufacturers often do not know the resonant frequency and DTH of their mechanical systems precisely. Therefore, the calculation of the specific mechanical system's resonant frequency and DTH rather than depending on the manufacturer's expected values improves precision in the mechanical system use. The backchannel calculations may be used either to replace or to improve corresponding pre-programmed values.
Abstract:
Embodiments of the present invention provide a motor-driven mechanical system with a detection system to measure properties of a back channel and derive oscillatory characteristics of the mechanical system. Uses of the detection system may include calculating the resonant frequency of the mechanical system and a threshold drive DTH required to move the mechanical system from the starting mechanical stop position. System manufacturers often do not know the resonant frequency and DTH of their mechanical systems precisely. Therefore, the calculation of the specific mechanical system's resonant frequency and DTH rather than depending on the manufacturer's expected values improves precision in the mechanical system use. The backchannel calculations may be used either to replace or to improve corresponding pre-programmed values.
Abstract:
A method and system that may include a pair of amplifier transistors and an output coupled to a load device. The precharge buffer may be controlled by an activation signal. The precharge buffer may also include a pair of level shifters. Each level shifter may be provided in association with a respective one of the transistors, and each may provide a respective level shift to an input signal at a common signal source based on a reference voltage. Outputs of the level shifters may be coupled to the respective transistors. The precharge buffer may also include a bypass signal path extending from the common signal source to the load device. A signal path may be controlled by another activation signal, and the precharge buffer and the bypass signal may be enabled during mutually exclusive states of the activation signal.
Abstract:
A drive signal for a motor-driven mechanical system has zero (or near zero) energy at an expected resonant frequency of the mechanical system. The drive signal may be provided in a series of steps according to a selected row of Pascal's triangle, wherein the number of steps equals the number of entries from the selected row of Pascal's triangle, each step has a step size corresponding to a respective entry of the selected row of Pascal's triangle, and the steps are spaced from each other according to a time constant determined by an expected resonant frequency of the mechanical system. Alternatively, the stepped drive signal may be provided as a series of uniform steps according to a selected row of Pascal's triangle, in which the steps are provided in a number of spaced intervals corresponding to the number of entries from the selected row of Pascal's triangle, each interval includes a number of steps corresponding to a respective entry from the selected row of Pascal's triangle and the intervals are spaced in time according to a time constant determined from the expected resonant frequency of the mechanical system. These techniques not only generate a drive signal with substantially no energy at the expected resonant frequency, they provide a zero-energy “notch” of sufficient width to tolerate systems in which the actual resonant frequency differs from the expected resonant frequencies.
Abstract:
A method and system that may include a pair of amplifier transistors and an output coupled to a load device. The precharge buffer may be controlled by an activation signal. The precharge buffer may also include a pair of level shifters. Each level shifter may be provided in association with a respective one of the transistors, and each may provide a respective level shift to an input signal at a common signal source based on a reference voltage. Outputs of the level shifters may be coupled to the respective transistors. The precharge buffer may also include a bypass signal path extending from the common signal source to the load device. A signal path may be controlled by another activation signal, and the precharge buffer and the bypass signal may be enabled during mutually exclusive states of the activation signal.
Abstract:
Disclosed are a method, device, and system for a microelectromechanical (MEM) device control system that can control the operation of a MEM device. The system can include a microelectromechanical device and a control circuit. The micromechanical device can include a moveable member coupled to an electrical terminal, a sensor, responsive to a movement of the moveable member, can output a sensor signal based on the movement of the moveable member, and an actuating electrode for receiving a control signal. The control circuit can be responsive to the signals output by the sensor and outputs the control signal to the actuating electrode.
Abstract:
Disclosed are a method, device, and system for a microelectromechanical (MEM) device control system that can control the operation of a MEM device. The system can include a microelectromechanical device and a control circuit. The micromechanical device can include a moveable member coupled to an electrical terminal, a sensor, responsive to a movement of the moveable member, can output a sensor signal based on the movement of the moveable member, and an actuating electrode for receiving a control signal. The control circuit can be responsive to the signals output by the sensor and outputs the control signal to the actuating electrode.
Abstract:
A drive signal for a motor-driven mechanical system has zero (or near zero) energy at an expected resonant frequency of the mechanical system. The drive signal may be provided in a series of steps according to a selected row of Pascal's triangle, wherein the number of steps equals the number of entries from the selected row of Pascal's triangle, each step has a step size corresponding to a respective entry of the selected row of Pascal's triangle, and the steps are spaced from each other according to a time constant determined by an expected resonant frequency of the mechanical system. Alternatively, the stepped drive signal may be provided as a series of uniform steps according to a selected row of Pascal's triangle, in which the steps are provided in a number of spaced intervals corresponding to the number of entries from the selected row of Pascal's triangle, each interval includes a number of steps corresponding to a respective entry from the selected row of Pascal's triangle and the intervals are spaced in time according to a time constant determined from the expected resonant frequency of the mechanical system. These techniques not only generate a drive signal with substantially no energy at the expected resonant frequency, they provide a zero-energy “notch” of sufficient width to tolerate systems in which the actual resonant frequency differs from the expected resonant frequencies.