FUNCTIONAL

RF DECK

DESCRIPTION

ASSEMBLIES

amplified, and coupled out for use in internal level- ing. The detected RF sample is routed to the A10

ALC PCB.

The 0.01 to 2 GHz RF output from the down con- verter goes to input connector J1 of the switched fil- ter assembly. There, the 0.01 to 2 GHz RF signal is multiplexed into the switched filter’s output path.

0.5to 2.2 GHz The 0.5 to 2.2 GHz Digital Down Converter assem- Digital Down bly (Figures 2-6 and 2-7), found in the 682X5B/

Converter 683X5B models, provides improved phase noise

across the 0.5 to 2.2 GHz frequency range. Power is applied to the down converter assembly at all times; however, the down converter amplifier is powered on by the A13 YIG Driver PCB only when the 0.5 to 2.2 GHz frequency range is selected.

During CW or swept frequency operations in the 0.5 to 2.2 GHz frequency range, the 2 to 4.4 GHz RF signal output from J3 of the switched filter assem- bly goes to the input connector J1 of the digital down converter. In the down converter, the 2 to

4.4 GHz RF signal is divided by 2 to produce fre- quencies of 1 to 2.2 GHz and divided by 2 again to develop frequencies of 0.5 to 1 GHz. From the fre- quency dividers, the 0.5 to 2.2 GHz RF signal then goes to the modulator which provides power level control, AM, and pulse modulation of the RF sig- nals.

In addition to the 0.5 to 2.2 GHz RF signal from the frequency dividers, the modulator has two other in- puts—the modulator control input and the pulse in- put. The modulator control input adjusts the gain of the modulator to control the power level of the RF output signals. The modulator control signal is re- ceived from the A9 PIN Control PCB where it is de- veloped from the ALC control signal. Amplitude modulation is accomplished by varying the modula- tor control signal with the modulating signal. Pulse modulation is achieved by switching the modulator on and off at a rate determined by the modulating pulse input. The modulating pulse input is received via connector J4 from the A6 Pulse Generator PCB. The modulating pulse signal is also routed out via connector J5 to the switched filter assembly.

The RF signal from the modulator is amplified and fed via PIN switches to the switched low-pass fil-

682XXB/683XXB MM

2-25

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Anritsu 683XXB, 682XXB manual Alc Pcb
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682XXB, 683XXB specifications

The Anritsu 683XXB and 682XXB series are advanced vector network analyzers (VNAs) renowned for their precision and versatility in characterizing RF and microwave components. Designed for engineers and technicians involved in the development, manufacturing, and testing of high-frequency devices, these analyzers offer state-of-the-art technology that ensures optimal performance in various applications.

One of the hallmark features of the Anritsu 683XXB and 682XXB is their high dynamic range, which allows for accurate measurements of small reflection and transmission coefficients, essential for assessing the performance of complex RF structures. With frequency coverage extending from DC to 70 GHz, these analyzers cater to a broad spectrum of applications, making them suitable for industries such as telecommunications, aerospace, and automotive.

The user-friendly interface of the Anritsu VNAs is complemented by a high-resolution display, which facilitates easy navigation through measurement setups and results. The analyzers feature multiple measurement modes, including S-parameter measurements, time-domain analysis, and noise figure measurements, providing engineers with comprehensive tools for device characterization.

Both the 683XXB and 682XXB implement advanced calibration techniques, including automated calibration and error correction methods, to enhance measurement accuracy. These methods significantly reduce the uncertainties associated with test setups, enabling reliable performance evaluations of components like filters, amplifiers, and antennas.

Anritsu’s proprietary technologies, such as the VectorStar and ShockLine series integration, further empower the 683XXB and 682XXB models. These technologies enable high-throughput testing and improved measurement stability, addressing the needs of modern production environments that demand rapid turnaround times without sacrificing precision.

Additionally, the analyzers come equipped with various connectivity options, including USB, LAN, and GPIB, ensuring seamless integration into automated test systems. This adaptability enhances the analyzers' utility in both laboratory settings and field operations.

In conclusion, the Anritsu 683XXB and 682XXB series vector network analyzers represent the pinnacle of RF and microwave testing technology. With their unmatched precision, comprehensive measurement capabilities, and advanced calibration techniques, these instruments are indispensable tools for professionals striving to push the boundaries of high-frequency device performance and reliability.
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