摘要 |
The present invention relates to a ferroelectric varactor (400) that comprises a dielectric-layer stack (408) between electrodes (406, 410). The dielectric- layer stack comprises an alternating layer sequence of at least three dielectric layers. At least two first dielectric layers of the dielectric-layer stack are made of a non-single-crystalline first dielectric material having a first dielectric constant, at least one second dielectric layer of the dielectric-layer stack is made of a non-single-crystalline second dielectric material with a second dielectric constant that differs from the first dielectric constant. One of the first and second dielectric materials exhibits a weaker ferroelectric hysteresis. The dielectric material with the weaker ferroelectric hysteresis makes up more than 20 % of the total volume of the dielectric- layer stack. The ferroelectric varactor of the present invention achieves high relative dielectric permittivities in the dielectric layers, a high breakdown voltage, a large tuning range at low voltages, and low dielectric losses. |
申请人 |
NXP B.V.;BEELEN, DANIELLE;KLEE, MAREIKE;REIMANN, KLAUS;KEUR, WILHELMUS, C.;MAUCZOK, RUEDIGER |
发明人 |
BEELEN, DANIELLE;KLEE, MAREIKE;REIMANN, KLAUS;KEUR, WILHELMUS, C.;MAUCZOK, RUEDIGER |