Array of coupled phase-locked oscillators at 160 GHz

Abstract

Abstruct-A ten-channel millimeter-wave heterodyne phase measurement system is currently under construction. This system will be used for electron density measurement at the plasma experiment W7-AS. Main features are: 1) twofold usage of each 160-GHz oscillator to excite both the transmitting signal to the plasma and the local oscillator (LO) signal for downconversion and 2) the phase-locked loops (PLL's) of each oscillator are coupled in a chain. This letter describes the millimeter-wave part and the digital PLL circuits of that system. Test results of the first three channels, which are already running in the laboratory, are presented.

Architecture of Realized Millimeter‐Wave Diagnostic Systems

“…Since improving the source frequency stability is the most direct approach to reduce the resulting phase changes δ , modern microwave interferometers operate with highly stable signal generators [4]. The stability is obtained by phase locking the microwave source to stable quartz oscillators as shown in the block diagram shown in Figure 8.5 and described in Section 7.6.…”