Design of Low Phase Noise and Low Stray Frequency Source Based on FPGA+HMC833

Abstract

Abstract-Microwave resonator sensor has been applied to various fields of measurement. A frequency source with low phase noise, low stray, low power consumption, small step is the key to measurement of microwave resonator sensor. In order to adapt the requirements of the measurement, this paper selects and uses HMC833 phase locked loop (PLL) chip to design frequency source, and uses FPGA to control PLL chip, designs a reliable frequency source through taking full advantage of FPGA and low phase noise and low stray of HMC833. At last of this paper, test results show that the frequency source can meet each requirement.

Design of Wireless Sweep Signal Receiving and Dispatching Hardware System Based on SiBCN Temperature Sensor

“…At this point, if the external excitation signal and the resonant cavity resonance occurs, it will form a standing wave in the cavity and the excitation signal energy is absorbed in the sensor.The energy reflected back at the resonant frequency point is minimum. Therefore, as long as the energy value of the echo signal is detected,the resonance of the sensor will be judged.According to this characteristic, the reflection coefficient (S11 parameter) which stand for the output signal and input signal ratio of the sensor slot antenna can be used to evaluate: signal Input signal Output  S (5) The SiBCN temperature sensor is excited by the swept signal sent by the excitation source.The slot antenna receives the swept signal and sends the echo signal.The signal frequency will not change, instead of the energy value of the signal is changed before and after stimulation. In this paper, the corresponding S11 curve is obtained by collecting the data, the ordinate of the curve represents the gain (dB), and the abscissa represents the frequency (GHz).…”

“…The signal source chip used in this system is a low phase noise (<-170dBc / Hz) produced by Analog Devices, broadband, integrated fractional frequency divider PLL HMC833 chip [5], as shown in Figure 4.The chip is internally integrated with voltage controlled oscillator (VCO), charge pump (CP), integrated phase detector (PFD), Σ-Δ modulator, and N or R frequency division doubler (DIV). The VCO has a base frequency range of 0.015 to 3GHz.…”

The Software Design of SiBCN Temperature Sensor Wireless Sweep Signal Receiving and Dispatching System Based on FPGA

“…SPI Write HMC833 Register Timing Diagram [3] After the completion of the SPI read and write communication function, the successful completion of the HMC833 chip internal VCO and PLL two sets of registers configuration, you can achieve the output of the RF signal. The REG 05H controls all the VCO register, for the output frequency setting signal source chip ratio and output power; while the PLL register is mainly used to control the signal source chip mode, which includes mode setting, fractional ratio coefficient setting [4]. As shown in Table 1, when the 5GHz signal is emitted by the signal source, the reference table of the register parameter value of the HMC833 in fractional frequency mode is given.…”