Radio frequency signal generating device

A technology for generating devices and radio frequency signals, which is applied in the field of radio frequency signal sources, can solve the problems of high price, complex structure, poor spurious signal suppression ability, etc., and achieve the effect of convenient operation, convenient operation and extended frequency output range

CN101726712BActive Publication Date: 2012-11-21ウーハンジョンケニウジンマグネティックレゾナンステクノロジーカンパニーリミテッド

0 Cites 0 Cited by

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: ウーハンジョンケニウジンマグネティックレゾナンステクノロジーカンパニーリミテッド
Publication Date: 2012-11-21

Smart Images

Figure 1

Patent Text Reader

Abstract

The invention discloses a radio frequency signal generating device. A control circuit is connected with a configuration port of a digital frequency synthesizer, a reference end of an operational amplifier of an automatic level control circuit and a tuning end of a voltage-controlled oscillator; a clock distribution circuit is connected with the digital frequency synthesizer, a frequency mixer anda comb-shaped spectrum generating circuit; the digital frequency synthesizer is connected with the clock distribution circuit and the frequency mixer; a local oscillation signal is connected with a switch; the switch is connected with a local oscillation input port of a quadrature modulating circuit; the output port of the comb-shaped spectrum generating circuit is connected with a third frequency mixer; the voltage-controlled oscillator is connected with the third frequency mixer, the frequency mixer and the control circuit; the frequency mixer is connected with a band-pass filter; the band-pass filter is connected with the automatic level control circuit; the output port of the automatic level control circuit is connected with the frequency mixer; and the frequency mixer is connected with the band-pass filter. The invention has digital control, good generality, low cost, flexible frequency setting and good stray and phase noise performance.

Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the technical field of radio frequency signal sources, more specifically to a radio frequency signal generating device, a digital low-noise radio frequency signal source capable of high-speed frequency switching and amplitude and phase modulation, and the device can also be used for nuclear magnetic resonance spectrometers and Magnetic resonance imager. Background technique

[0002] The radio frequency signal source is an essential and important part of the nuclear magnetic resonance instrument. A typical RF signal synthesizer is a frequency synthesizer (Programmable Test Source, PTS), which is mainly composed of a standard frequency module (SGA, SGB), a high frequency resolution generation module (DM, DMA) and a three-mixer module. Among them, the standard frequency module generates several sets of standard frequencies and sends them to the high-frequency resolution generation module. The high-frequency resolution gen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More