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A millimeter-wave multiband phase-locked loop (PLL) is presented for the first time, which covers 40-, 60-, and 80-GHz bands. Three voltage-controlled oscillators corresponding to different frequencies are input to a multiband injection-locked frequency divider and switched on one at a time by a multiplexer as a band selector. The feedback loop embraces the following components: a chain of dividers with a fixed division-modulus of 256, a phase-frequency detector, a charge-pump, and a second-order loop filter. The PLL is clocked by a reference frequency of 78 MHz and its output power is higher than -9.5 dBm. The phase noise is -103 dBc/Hz at an offset frequency of 10 MHz. With a supply voltage of 1.5 V, the entire PLL consumes 114 mW. The chip is implemented in a 90-nm CMOS technology and measures 1.12 mm2.