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Low-pass filters/amplifiers offer high signal capacity

Posted: 16 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:filter? amplifier? wireless communications?

Linear Technology has introduced a family of four high-performance, dual fixed-frequency, low-pass active filters/amplifiers targeting an array of wireless communications and industrial signal processing equipment applications.

The LT6604-xx consists of two matched, fully differential amplifiers, combined with fourth-order filters along a Chebyshev low-pass response. Each device gives guaranteed matched amplitude and phase characteristics for current and next-generation wireless communication standards such as LTE and WiMAX, while addressing the challenge of channel matching.

Devices consisting the LT6604-xx family

? LT6604-2.5: 2.5MHz cut-off frequency

? LT6604-5: 5MHz cut-off frequency

? LT6604-10: 10MHz cut-off frequency

? LT6604-15: 15MHz cut-off frequency

These products are claimed to provide best-in-class low distortion and low noise, supporting a high system signal-to-noise performance. The differential output stage of each filter is designed to drive directly into high-sampling rate ADCs with minimum distortion and high signal-to-noise performance. Each amplifier has a minimum output swing of 2Vp-p and an adjustable common-mode voltage, letting it to interface to a wide range of ADCs.

The LT6604-xx combines baseband channel filtering and gain matching to form a compact solution for high-performance I/Q demodulators. These devices can be used as pre-filters for multichannel ADCs. Each filter in the LT6604 offers better than 0.9dB of in-band gain flatness right up to the cut-off frequency. The 4th order Chebyshev filter provides sharp roll-off while exhibiting minimum group delay response. The filter characteristics are specified for 3V, 5V and 5V supply operation. Each differential filter/amplifier gain can be set from 0dB to more than 12dB using a pair of external resistors.

The LT6604 draws a total quiescent supply current of 26mA per channel. All four devices are offered in a 34-lead, 4mm x 7mm QFN surface-mount package with identical pin-outs.

-Gina Roos

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