Vayyar Imaging Ltd.

Reut Wizenberg

Naftali Chayat

Nadav Mazor

A Q-enhanced radio-frequency filter featuring loss-compensating circuits with values that can be controlled to optimize loss compensation. Instabilities are avoided by temporarily introducing a reflection at a port (such as via short-circuiting the port) and testing for the beginning of oscillations. Certain embodiments provide negative-resistance circuits for loss compensation, including cross-coupled transistor pairs and adjustable capacitance. Further embodiments provide loss-compensating RF filters with planar inductors, including overlapping planar inductors.

Loss compensation in radio-frequency filters

A self-contained radio-frequency device featuring multiple overlapping coupled coil inductors in a planar configuration with overlaps selected for desired coupling between different pairs of coils, wherein the electromagnetic energy of the coils arises substantially only from the coils themselves and affects only the coils themselves. Overlapping configurations provide a compact space-saving form-factor for such a device a variety of applications, including filters, baluns, transformers, matching networks, amplifier stages, distributed amplifiers, and frequency multipliers. Space-saving is achieved by overlapping the coils while controlling the mutual inductance. The planar arrangements are applicable to a variety of technologies, such as integrated circuits (IC, ASIC, RFIC), ceramic multilayer technologies such as low temperature co-fired ceramics (LTCC), and to printed circuit boards (PCB). Planar arrangements of overlapping coils is illustrated with respect to filters, tunable filters and Q-enhanced filters.

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Tel Aviv, Israel

Reut Wizenberg