A high frequency phase reference
Date Issued
2004
Abstract
Magnetic Induction Tomography (MIT) requires signal measurements with a very high degree
of phase precision. To enable the development and characterisation of input amplifiers, signal distribution
and signal measurement system for MIT, a high precision phase reference capable of operating over the
frequency range DC - 50 MHz is being developed. The phase reference consists of two Direct Digital
Synthesizers (DDS) which are supplied with a common clock and control bus. The synthesizers are
programmable, allowing 14-bit resolution (20 m°) of the phase offset between the channels and 12-bit
control of the output amplitude (8Vpp max). The phase reference is controlled by a PC via a USB
interface. Details of the design of the phase reference and the results of measurements of the phase noise,
phase drift and phase skew performance of the system is given.
of phase precision. To enable the development and characterisation of input amplifiers, signal distribution
and signal measurement system for MIT, a high precision phase reference capable of operating over the
frequency range DC - 50 MHz is being developed. The phase reference consists of two Direct Digital
Synthesizers (DDS) which are supplied with a common clock and control bus. The synthesizers are
programmable, allowing 14-bit resolution (20 m°) of the phase offset between the channels and 12-bit
control of the output amplitude (8Vpp max). The phase reference is controlled by a PC via a USB
interface. Details of the design of the phase reference and the results of measurements of the phase noise,
phase drift and phase skew performance of the system is given.
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