Abstract: Micro-fluid ejection device actuator chips and methods of measuring temperature of a micro-fluid ejection device actuator chip are provided. An exemplary micro-fluid ejection device includes an actuator chip for delivering fluid from the device. In one such device, one or more fluid vias include a column of actuators per at least one of the sides of the vias that are apportioned into temperature zones. A temperature sense element or resistor (TSR), per each of the zones, measures a temperature therefor. In this manner, average die or chip temperature along a length of the one or more vias can be controlled closer to a predetermined value. In various aspects, individual actuators are apportioned into zones and dedicated TSRs sense temperatures of the zones. In turn, corrective action may be caused to increase or decrease temperature as the case may be. Representative zones include three per each side of a fluid via.

Abstract: Test circuits on heater chips for testing a heater circuit having a heater element and a first power device. The test circuit can include a second power device, a test device configured to hold the first power device off and the second power device on for a selected heater circuit when the test device receives a signal to activate the test circuit, and a common test output to transmit a signal indicative of a state of the selected heater circuit. Methods for using the same are also provided.

Abstract: Disclosed is a method and/or apparatus for adjusting the sample time and order associated with a digital correction system for maximizing output power and minimizing power stage delay sensitivity of a switching power stage. In certain embodiments, the sample point of an ADC may be changed as a function of the duty ratio of the PWM signal thus allowing higher performance and use of less expensive power stage components. In addition, adjustment of the order of an integrating error amplifier in the system permits operation of the power stage with an output being permitted to saturate up to the power supply rails, thus increasing a power output of the power stage.

Abstract: A fast and efficient median search method and filter searches a dynamically changing time-ordered list of data samples for a data sample representing the arithmetic median of the list. Embodiments include a method to reduce the number of memory access operations to 2N and a method to reduce the number of memory access operations to N, where N is the number of data samples searched. The described approach includes providing a circular list of N data samples including an incoming data sample replacing an outgoing data sample, and a median data sample. Then, updating the median data sample dependent on magnitudes of the incoming data sample, the median data sample, and the outgoing data sample.