High-impedance digitisers

Agilent has expanded its Acqiris high-speed digitiser product range with more functionalities on its PXI digitisers.

Both the U1061A and U1062A 8- and 10-bit digitisers now feature an optional high-impedance mezzanine, making these devices suitable for combining with a signal probe in ATE applications, such as telecommunications and semiconductor component testing.

The U1062A is said to be the world’s first 10-bit, 4 GS/s, 3U PXI digitiser, with input bandwidths of up to 2 GHz and acquisition memories of up to 256 MS/ch.

It reduces testing and data-acquisition time, making the digitiser suitable for high-speed ATE applications, where test time should be limited only by the speed limits of the device under test.

The dual-channel 8-bit U1061A, with up to 1 GHz of instant bandwidth, provides synchronous sampling on both input channels of 1 GS/s with up to 8 MS of acquisition memory.

In single-channel applications both digitisers provide the possibility of channel interleaving: either channel can be selected and the ADC’s interleaved, providing 2 GS/s and 16 MS memory (U1061A) and 4 GS/s and 512 MS (U1062A).

The high-impedance front end, which enables high-voltage measurements on both products, uses programmable front-end electronics to provide a complete set of input voltage ranges from 50 mV to 5 V full scale into 50 Ω and up to 50 V full scale into 1 MΩ impedance.

With a bandwidth into 50 Ω of 1 GHz for the U1061A and 1.4 GHz with the U1062A, using 1 MΩ impedance gives a bandwidth of 300 MHz. The amplifier response is optimised, with switchable filtering and fast recovery from out-of-range signals.