FUNCTIONAL

RF DECK

DESCRIPTION

ASSEMBLIES

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.

When the 683XXB is generating broad-band analog frequency sweeps (>100 MHz wide), the main tun- ing coil current tunes the oscillator through the sweep frequency range. Phase locking to fine adjust the oscillator’s output frequency is only done at the bottom and top of the sweep ramp and on both sides of each band switch point. Narrow-band analog fre- quency sweeps (￿100 MHz wide) in the 683XXB are accomplished by summing the appropriate sweep ramp signal into the oscillator’s FM tuning coil con- trol path. The YIG-tuned oscillator’s RF output is then swept about a center frequency that is set by the main tuning coil current. Phase locking to fine tune the output frequency is done at the center fre- quency of the sweep.

Power Level The RF output signal from the YIG-tuned oscillator Control and is fed to connector J6 of the switched filter assembly.

Modulation In the switched filter assembly, the RF signal is am- plified then goes to the modulator. A portion of the RF signal to the modulator is picked off and coupled out via connector J5 to the Sampler for use by the YIG loop circuitry. The modulator provides for power level control, AM, and pulse modulation of the RF output signals.

In addition to the amplified RF signal from the YIG-tuned oscillator, the modulator has two other inputs—the modulator control input and the pulse input. 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 J7 from the A6 Pulse Generator PCB.

RF Signal The RF signal from the modulator is fed via PIN

Filtering switches to the switched low-pass filters. PIN switch drive current is received from the A9 PIN Control PCB. A coupler in the switched filter path provides the RF signal for the down converter. Whenever an instrument is generating RF signals of <2 GHz (￿2.2 GHz for 682X5B/683X5B models), a RF signal is coupled out, through a 8.5 GHz low-pass filter and connector J3 to the down converter. Another

682XXB/683XXB MM

2-23

Page 50 Page 52
Page 51
Image 51
Anritsu 683XXB, 682XXB manual Functional RF Deck Description
Page 50 Page 52

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.
Top Page Image Contents