Design of non-magnetic temperature control system for alkali vapor cell of NMRG

Design on amplitude control circuit for DDS signal source based on AD9834

“…Beihang University utilizes a PID control module to regulate the control variable, which, after being processed by a data acquisition board, outputs a DC voltage signal ranging from -5V to 5V. This signal is then amplified using a power amplification circuit composed of the PA96 chip to achieve amplitude modulation [7] .University of Chinese Academy of Sciences achieves amplitude modulation by utilizing FPGA to generate control signals that regulate the attenuation rate of the HSMP-3816 attenuator through a DAC [8] .University of Shanghai for Science and Technology achieves amplitude modulation by utilizing the voltage reference pin (VSNS) and a variable resistor in the TPS54160 chip, rheostat, to regulate the output voltage level [9] .Institute of Automation，Chinese Academy of Sciences integrates the design of high-frequency signal generation and amplitude modulation circuits into the FPGA, and subsequently achieves amplitude modulation through DAC and power amplification circuits [10] .…”