An F-band active phase shifter in 28nm CMOS

In this paper an active phase shifter with high linear frequency dependency is presented for a FSK quadrature demodulator. The circuit is based on a coupled resonator to increase the linear phase shifting range and bandwidth. A capacitor bank, implemented as a digitally controlled artificial dielectric transmission line, is used to realize the phase shifting operation. The design methodology is explained and measurements of an implementation in a 28nm bulk CMOS are given. The design has a phase range of 123° and a phase resolution of 7.2° with a frequency dependent phase difference of 12.2 °/GHz. The circuit occupies an active area of 0.01 mm2 and draws a current of 9.5 mA from a 900mV power supply.

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