silicon germanium

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silicon germanium

(SiGe) A semiconductor material made from silicon and germanium. Germanium is very similar to silicon, but when one layer is grown on top of the other to form the base of the transistor, the resulting transistor can switch faster and yield higher performance.

SiGe transistors are compatible with standard fabrication processes and are built on the same chip with silicon transistors to create high-frequency circuits. Only a handful of SiGe transistors are used in mobile phones, while tens of thousands are used in optical switches, DACs and ADCs. See silicon and strained silicon.
References in periodicals archive ?
Participants had previously been assessed for food allergies by detailed history, SPTs and ImmunoCAP tests (Thermo Fisher Scientific/Phadia, Sweden) for allergen sIgE and incremental open food challenges.
From the above, it is difficult to obtain high-quality, high-content SiGe epitaxial layer due to the large lattice mismatch between Si and Ge.
In the majority of patients with a history of penicillin allergy, the diagnostic procedure started with determination of sIgE against penicillin G, V and/or amoxicillin (allergens were selected from the medical history) with ImmunoCAP system (Termo Fisher, Waltham, Massachusetts, USA).
"That's why we grew the GaAsP on the SiGe - it provides a more stable base."
Clinical history of allergic reactions after honeybee stings, and positive result of skin prick test, or serum specific IgE (sIgE) to honeybee venom present diagnosis.[sup][10] Since no commercial honeybee venom extracts available for skin tests in China, we measured serum honeybee venom sIgE to evaluate sensitivity instead.
Total serum immunoglobulin E (IgE) and sIgE for milk, eggs, and peanuts measured at the end of the second phase also were increased in patients with increasing AD severity.
The initial results indicated that sIgE to CCDs could be found in about 10% subjects and detection of CCDs in serum was not helpful in diagnostics of occupational allergy [8].
95% PPV Cutoff for Specific Foods (KU/L) Egg >7 Peanut >14 Cow's milk >15 Fish >20 Soy >65 Wheat >80 Infants (<2 years): Egg >2 Milk >5 Although sIgE is generally, but not invariably, less sensitive than SPT, current guidelines indicate that negative tests can be used to rule out allergy in most patients.
In patients that reported a history of a non-severe reaction more than 3 years earlier and were sIgE negative, DPT was performed without previous skin testing.
Renesas Electronics and California Eastern Laboratories (CEL) released a new SiGe: C High Frequency Low Noise Transistor, the NESG7030M04.