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San Jose, CA, United States

Micrel Incorporated, founded in 1978, is a global manufacturer of integrated circuits with corporate headquarters in San Jose, California. Micrel has been a publicly traded corporation since December 1994. In fiscal year 2009, it earned $219.6 million in revenue, and $16.3 million in net income.Micrel's products include mixed-signal, analog and power semiconductors, high performance communication, clock management, Ethernet switch and physical layer transceiver ICs. Micrel uses CMOS, bipolar, and other technologies for IC fabrication. Wikipedia.


A hold-up circuit coupled to a first node to receive an input voltage and to provide a hold-up voltage includes an inductor, a constant on-time buck-boost control circuit configured to drive a high-side power switch and a low-side power switch to operate in a buck mode and a boost mode of operation, and an energy storage capacitor. When the input voltage is greater than a predetermined threshold, the buck-boost control circuit is configured to drive the power switches in the boost mode to charge the capacitor to a capacitor voltage greater than the input voltage. When the input voltage is less than the predetermined threshold, the buck-boost control circuit is configured to drive the power switches in the buck mode to supply the energy stored on the capacitor to the inductor to provide a regulated voltage less than the capacitor voltage as the hold-up voltage to the first node.


A distributed infusion pump system is provided with long-term recording of the type of medication, nutrition or hydration, pump output pressure, corresponding infusion flow, infusion flow resistance, and an automatic or manual alarm in the event that thresholds applied to these parameters or their derivatives are exceeded.


A compound spring MEMS resonator includes a resonator body constructed using one or more spring unit cells forming a compound spring block and one or more compound spring blocks forming the resonator body. Each compound spring block is anchored at nodal points to ensure a high quality factor. The resonator body further includes masses attached to the open ends of the compound spring block and capacitively coupled to drive/sense electrodes. The dimensions of the spring unit cells, the number of spring unit cells for a compound spring block, the size and weight of the masses, and the length and width of the support beams are selected to realize a desired resonant frequency. Meanwhile, the number of compound spring blocks is selected to tune the desired electrical characteristics, such as impedance, of the MEMS resonator.


Patent
Micrel | Date: 2015-10-14

A multiple coil spring MEMS resonator includes a center anchor and a resonator body including two or more coil springs extending in a spiral pattern from the center anchor to an outer closed ring. Each pair of coil springs originates from opposing points on the center anchor and extends in the spiral pattern to opposing points on the outer ring. The number of coil springs, the length and the width of the coil springs and the weight of the outer ring are selected to realize a desired resonant frequency


Patent
Micrel | Date: 2015-11-03

An infusion pump comprises peristaltic pump means with tubing comprising four zones. The first, most upstream, zone provides for an engagement element to engage the tubing during movement along the first zone, and the engagement element remains in engagement with the tubing during movement along the second and third zones. The fourth, most downstream, zone provides for an engagement element to disengage from the tubing during movement along the fourth zone. The length of each of the zones is shorter than the distance between the two neighboring engagement elements, and the sum of the second and third zone lengths is equal to the distance between the two neighboring engagement elements. The second zone cross-section is larger than the third zone cross-section, leading to a volume increase which is at least equal to a volume increase displaced in the fourth zone resulting from disengagement of an engagement element from the tubing.

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