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A face-to-face chip stacking isolator structure, which makes it easy to enhance the insulation voltage, is proposed. Transmitter (Tx) and receiver (Rx) chips, each of which has a coil, are stacked and communicate through a magnetic coupling of the coils. The die attach film sandwiched by the two chips not only bonds the chips but also enhances the insulation voltage by taking advantage of its thickness. With test chips, the breakdown voltage of 7kV RMS is demonstrated and >20-year lifetime with a working voltage of 1.5kV is estimated by extrapolation of time-dependent dielectric breakdown results.I.

An ultra-wide frequency range tunable LC-VCO is developed using a novel multi-stage variable inductor, which has a bridge architecture and a miniature 3D solenoid structure. Because of the inductor, the continuous tuning range over 15GHz (5∼20GHz) is achieved with 10.6mW total power consumption. Phase noise at 1MHz offset is -103dBc/Hz @10GHz and -87dBc/Hz @20GHz. The chip area is smaller than 1/10 of wide range LC-VCOs reported.

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