Mixer As A Phase Detector. 38 x 0. A phase detector is a frequency mixer, analog multiplier or

38 x 0. A phase detector is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs. The basic form of a phase locked loop (PLL) consists of a voltage controlled oscillator (VCO), a phase detector (PD), and a filter. The double balanced mixer of diode ring phase detector is a simple and effective form of phase detector that can be implemented using a standard diode ring module. Feb 1, 2011 · In this paper, a single RF and LO input mixer, which we use as a phase detector for the PLL, is presented and implemented. With the use of microwave photonics, the mixer-based phase detector can be operated over a very wide frequency range. Keeping the input and output phase in lockstep also implies keeping the input and output frequencies the same; thus, a phase-locked loop can also track an input frequency. One difficulty is that actual mixers operate in a wide range of power (150 dB or more) and frequency (up to 3 decades). In its more general form (Figure 1), the PLL may also contain a mixer and a digital divider. We simply take a lot of old ideas and put them into a sort of mental Phase frequency detector, frequency, and phase lock.

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