FUNCTIONAL

FREQUENCY

DESCRIPTION

SYNTHESIS

Frequency

Frequency modulation (FM) of the YIG-tuned oscil-

Modulation

lator RF output is achieved by summing an external

 

or internal modulating signal into the FM control

 

path of the YIG loop. Refer to Figures 2-1 and 2-2.

 

The external modulating signal comes from the

 

front panel or rear panel FM IN input; the internal

 

modulating signal comes from the A8 Function Gen-

 

erator PCB. Circuits on the A11 FM PCB adjust the

 

modulating signal for the FM sensitivity selected,

 

then sum it into the YIG loop FM control path.

 

There, it frequency modulates the RF output signal

 

by controlling the YIG-tuned oscillator’s FM (fine

 

tuning) coil current.

Phase

Phase modulation (￿M) of the YIG-tuned oscillator

Modulation

RF output is achieved by summing an external or

(Option 6)

internal modulating signal into the FM control path

 

of the YIG loop. The external modulating signal

 

comes from the front panel or rear panel FM IN/￿M

 

IN input; the internal modulating signal comes from

 

the A8 Function Generator PCB. Circuits on the

 

A11 FM PCB adjust the modulating signal for the

 

￿M sensitivity selected, convert the modulating sig-

 

nal to a ￿M signal by differentiation, and then sum

 

it into the YIG loop FM control path. There, it phase

 

modulates the RF output signal by controlling the

 

YIG-tuned oscillator’s FM (fine tuning) coil current.

Analog Sweep

Broad-band analog frequency sweeps (>100 MHz

Mode

wide) of the YIG-tuned oscillator RF output are ac-

(683XXB only)

complished by applying appropriate analog sweep

 

ramp signals, generated by the A12 Analog Instruc-

 

tion PCB, to the YIG-tuned oscillator’s main tuning

 

coil (via the A13 YIG Driver PCB). In this mode, the

 

start, stop, and bandswitching frequencies are

 

phase-lock-corrected during the sweep.

NOTE

For 683X5B models at frequencies of ￿2.2 GHz, broad-band analog fre- quency sweeps are >25 MHz wide; narrow-band analog frequency sweeps are ￿25 MHz.

Narrow-band analog frequency sweeps (￿100 MHz wide) of the YIG-tuned oscillator RF output are ac- complished by summing appropriate analog sweep ramp signals, generated by the A12 Analog Instruc- tion PCB, into the YIG-tuned oscillator’s FM tuning coil control path. The YIG-tuned oscillator’s RF out- put is then swept about a center frequency. The cen- ter frequency is set by applying a tuning signal (also from the A12 PCB) to the YIG-tuned oscillator’s main tuning coil (via the A13 YIG Driver PCB). In this mode, YIG loop phase locking is disabled except during center frequency correction, which occurs during sweep retrace.

2-14

682XXB/683XXB MM

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Anritsu 682XXB, 683XXB manual Frequency
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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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