Phase-Noise Measurement of Microwave Oscillators Using Phase-Shifterless Delay-Line Discriminator

Extended Noise Analysis Model of CW-type Radar Sensors with IQ Down-Conversion

“…The measurement of phase noise is described, e.g., in an application note [16], and papers [17][18][19][20][21][22]. In [18], [19], descriptions of simultaneous amplitude and phase noise measurement are presented.…”

A Phase Shift Demodulation Technique: Verification and Application in Fluorescence Phase Based Oxygen Sensors

“…As the phase detection technique applied to scientific research, production practice, and other fields, the requirement of the phase detection technology turns to high precision and high intelligent. The main methods of phase shift measurement contain the variable delay-line method [1], phase-locked method [2], correlation method [3,4], and the method of over-zero time [5]. In this paper, a system based on the subtraction measuring the phase shift is proposed.…”

Six-Port-Based Architecture for Phase Noise Measurement in the UWB Band

“…Recently, a new architecture for phase noise measurement based on delay line discriminator has been proposed [11]. In this circuit, a dual phase detector architecture and a 90-degree hybrid allow the detection of the phase noise from the in-phase and quadrature ( / ) signal components without quadrature adjustment.…”

“…In this circuit, a dual phase detector architecture and a 90-degree hybrid allow the detection of the phase noise from the in-phase and quadrature ( / ) signal components without quadrature adjustment. Even though this architecture needs neither reference oscillator nor quadrature adjustment circuitry, it has an important disadvantage: its input-referred phase noise floor considerably increases at lower input power levels [11]. A good solution to improve the phase noise measurement of this new architecture is the utilization of a six-port demodulator (see Figure 3).…”

“…The architecture proposed in this work makes use of the idea of dual / phase noise detection based on a delay line discriminator [11] and the six-port architecture used in [13] in order to implement a compact phase noise measurement system. This architecture uses neither reference oscillator nor a phase shifter for quadrature adjustments.…”