Abstract: A radio frequency (RF) receiver front-end includes an low noise amplifier (LNA) module, a current domain mixing module, and a buffer module. The LNA module is coupled to amplify an inbound RF signal to produce an amplified inbound RF current signal. The current domain mixing module is coupled to mix the amplified inbound RF current signal with a local oscillation to produce a mixed current signal. The buffer module is coupled to provide a baseband or near baseband voltage signal from the mixed current signal.

Abstract: A phase-locked loop (PLL) includes at least first and second loops, and loop selection circuitry coupled to the first and second loops, the loop selection circuitry being responsive to at least one loop select signal to control transition from an operating mode of one of the first and second loops to an operating mode of the other of the first and second loops. In an illustrative embodiment, the PLL comprises a dual-loop PLL with the first and second loops corresponding to respective frequency and phase loops, and the loop selection circuitry is configured such that the loop select signal as applied to a control input of a current-generating component of the first loop represents a delayed and inverted version of the loop select signal as applied to a control input of a current-generating component of the second loop.