Condition:New
Type:Logic ICs
Model Number:AD9834
Model:JYSP-60
Applicable scenario:Portable
Rated voltage:5V
Power accuracy:10%
bandwidth:60MHz
Rated current:0.2A
? ? ?For hands-on lovers, the frequency of using the frequency sweeper is very high, after all, the selection of intermediate frequency materials (including the physical inductance and capacitance element manufacturing process and component dielectric coefficient) is very important;???? ? ? The traditional electrician work, which mainly focuses on maintenance, places more emphasis on work convenience. At low frequencies, the component manufacturing process and the dielectric constant of the component materials can be ignored. Experience is the main factor, and a convenient capacitor inductance meter is sufficient.???AD9834 frequency sweeper -40 V2.02, capacitance and inductance tester (without aluminum case)??Attribute: RF Frequency Domain Analysis Tool?Interface: usb?Power: usb?Standby current: ≤60Ma ,,,, to avoid the "high current event" of the whole machine current is greater than 200mA for a long time, it is important for separate USB power supply, simplify the focus of NWT4.?Sweep current: ≤80mA?Sweep bandwidth: 0.05mHz --- 40mHz?Sweep step: ≥ 1Hz?Sweep speed: ≥800 points / second?Sweep dynamic logarithmic ratio:> 70dB (-75dBm ~~~ + 5dBm)?Point frequency or sweep frequency output power: -3dBm --- 5 dBm?Input detection: ≤10dbm?Software used on the computer side: NWT4.09.07?Computer operating system: winxp, win732, win764 (win10, most can)???Application: The analysis of the frequency characteristics of the dual-port network of the RF circuit. The frequency characteristic analysis is the basis for R & D, debugging and maintenance of the RF circuit. Instrumentation for R & D, maintenance and debugging of terminal IF.?The frequency sweeper is the master machine engaged in radio work. The frequency sweeper is an instrument used to measure the high-frequency parameters of capacitance and inductance. The high-frequency L (C) Q value, parasitic capacitance, and high-frequency dielectric loss of C are important indicators. These high-frequency indicators are as important as The function of its own capacitance and inductance.????Applicable: radio enthusiasts, young students?NWT4 is a very good design. The design focus of this product is to simplify its protocol instructions and reduce the current of its original design.?????Core components: stm32f103 single-chip microcomputer. As a built-in can2.0 controller becomes the most familiar single-chip microcomputer for hardware engineers, it has a function library for programming. We only use popular single-chip computers. There are many learning materials on Baidu, self-study is easy, and the price is friendly.???AD9834, typical DDS chip, digital synthetic oscillator, maximum internal clock 100mhz in the full bandwidth 50khz--40mhz, the suppression ratio of fundamental wave and harmonics (spurious control) can reach more than 60db through simple low pass You can see a smooth, non-deformed sine wave), which is more accurate when measuring, very good, low power consumption, perfect match with OPA695 high-speed operational amplifier.?????Working principle: Using the VFO source constituted by AD9834, the frequency of the dual-port circuit network is automatically and quickly scanned point by point to obtain the S21 parameter curve.?????Appearance: circuit board size 60mmX98mm
Core components: STM32F103 single-chip computer, as a result of the built-in can 2.0 controller has become the most familiar single-chip computer to the majority of hardware engineers, programming function library, hands-on very fast.
AD9834, a typical DDS chip, a digital synthetic oscillator, a maximum internal clock of 100 mhz, the suppression ratio of fundamental wave to harmonic wave (spurious control) in the full bandwidth of 50 khz-40 mhz, can reach more than 60 dB through simple low-pass energy (using 200 m bandwidth oscilloscope can see smooth and deformed sinusoidal wave). The measurement is accurate, quite good, low power consumption, and matches OPA695 high-speed operational amplifier perfectly.
The overfrequency performance of ad9834 is very good. When using 100MHz osc, the actual current of the whole machine has not increased. It seems that the overfrequency potential is very large. Actually, when I use osc150m active crystal to overfrequency to 60m detection bandwidth, the working current of the whole machine is not much more than a few mA, which has nothing to do with AD9834. It is caused by OSC power supply unlimited current, and 75 ohm resistance current limit is normal.
Working Principle: VFO source composed of AD9834 is used to automatically and quickly sweep the network frequency of two-port circuit point by point, and the S21 parameter curve is obtained.
Appearance: Circuit Board Size 60mm X98mm
Note: In order to adapt to the new OSC 150 MHz as the reference sampling frequency of this DDS, the 50 kHz - 60 MHz low pass of the suppression mirror frequency is changed as follows for reference only.
Measuring capacitance and inductance by sweeping frequency line (frequency-amplitude characteristic curve) is the duty of sweeper. Compared with the frequency spectrum, its step can be very small to 1hz. The measurement bandwidth is very meaningless. The bandwidth of tens of megabytes is enough. The parameters involved in high frequency capacitance and inductance are not single values, but also involve high frequency dielectric loss of capacitance, parasitic capacitance of inductance, Q value of LC, etc. By comparing the sweep lines, the measurement is made.
Through the sweep line, you can understand the relationship between capacitance value, inductance value, Q value and frequency. These experiences are the basic knowledge to "mage".
We now compare the patch inductors with the same inductance and the 0.5 enameled coils. The LC parallel circuit uses the same 1000pf capacitance for testing.
SMD inductance is 205nhThe inductance of the coil can be adjusted to 205nh, which is the same harmonic frequency as the chip inductance.
The harmonic frequency of LC loop is measured by using the phenomenon of pure resistance (maximum impedance) at its harmonic point. The value of Q is measured by comparing the "sinking" depth of sweep line at the harmonic point.
We can see that the Q value of the LC loop composed of coils is higher than that of the patch inductor. The high Q value of LC frequency selection in oscillating circuit means that the frequency stability is good.
Here is the process of measuring inductance and calculating inductance value with software when measuring capacitance value of LC circuit by sweeping line harmonic point method.
In this way, the inductance of 65.55nh can be calculated accurately by software through the known capacitance value of 2000 PF in LC circuit.
Conversely, capacitance is measured with known inductance.
Q value of inductance (quality factor, rectangular coefficient) because there are many factors determining Q value (parasitic capacitance, dielectric loss, iron loss, and process), the way of comparing sweep curve is very intuitive. For example, the inductance of 100uh is also measured. In order to compare, a self-made resistance coil of 100uh is added.
Width is inversely proportional to Q value. This inductance is obviously higher than Q value of resistance coil. The Q-value factor that determines L (C) is a lot of.
Sweep line comparison, because intuitive easier to understand and easier to grasp.
Measuring 455 Ceramic Filter
Direct measurement of 50 ohm impedance (mismatch)
High resistance matching
Measuring 10.7 Crystal Filter
Measurement of 8 MHz crystal oscillation
OUT port can also output point frequency
Annex: SMA jumper 2pcs (20cm long); USB line 1pcs ,and files send by netdisc.
