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Track-and-hold amps suit UWB apps

Posted: 24 Apr 2006     Print Version  Bookmark and Share

Keywords:1820TH  1821TH  track-and-hold amplifiers  THA  Inphi 

Inphi Corp. claims to have set a new industry standard with the launch of its GigaTrack family of 2GSps track-and-hold amplifiers (THA) that deliver ultra-wide 18GHz analogue bandwidth.

The combined bandwidth, sample rate and linearity of these four track-and-holds are said to make possible direct conversion and software-defined receivers. The THAs operate from a single, -5.2V power supply and dissipate 1.3W.

"GigaTrack track-and-holds will enable an entirely new class of instrumentation, communications, ATE, and military systems," said Kevin Nary, Inphi's vice president of engineering. "In addition to providing the highest performance available, the low power dissipation and size of these devices will result in digital receivers and data acquisition systems that are themselves low power and compact," he said.

With the GigaTrack THAs, engineers can for the first time replace numerous components in traditional heterodyne receiver architectures with a track-and-hold and a high sample rate ADC, Nary said. "The resulting receivers are lower power and more compact than traditional heterodyne receivers and they provide far more flexibility," he said.

The BGA versions of the GigaTrack family offer 18GHz (small signal) and 15GHz (0.5V peak to peak) input analogue bandwidths with >60ps settling times. Plastic QFN versions provide 13GHz analogue bandwidth (100mV peak to peak).

Total harmonic distortion (-70dB typical at 1GHz and 500mV peak to peak input) and aperture jitter (<50fs) support improved ADC signal-to-noise-and-distortion ratios, according to Nary.

The 1820TH and 1821TH are both supported in a 49-pin, 6mm BGA package. The 1821TH is also offered in die form.

The 1820TH and 1821TH with clock mode select are priced at $489 and $549, respectively in 1,000-piece quantities. The lower bandwidth 1320TH and 1321TH are supported in a 24-pin, 4mm QFN package priced at $329 and $379, respectively in same quantities.

- Bettyann Liotta
eeProductCenter




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