Abstract: Described herein is an apparatus and a method for a low noise infinite radio frequency (RF) delayed-locked loop (DLL). The apparatus comprises a phase detector having a first input configured to receive a first RF signal, a second input, and an output; an infinite phase shifter having a first input configured to receive a second RF signal, an input bus, and an output connected to the second input of the phase detector; and a controller having a first input connected to the output of the phase detector and an output bus connected to the input bus of the infinite phase detector, wherein the output of the infinite phase shifter comprises a low noise signal in phase alignment with the first RF signal.

Abstract: Methods and apparatus for an absorptive, phase invariant signal attenuator. In embodiments, PIN diodes can be coupled to a hybrid coupler. Incident power can be split by the coupler to a terminating resistor, a terminating diode, and a series diode. The terminating diode becomes increasingly well matched and absorptive over the attenuation range. The series diode becomes increasingly mismatched and reflective over the attenuation range. The terminating resistor increasingly absorbs incident power as the coupling value decreases due to increasing diode impedance over the attenuation range.