AOR AR2300 Specifications download pdf (Page 53)

15. I/Q DIGITAL OUTPUT DETAILS FOR DEVELOPPERS

1 GENERAL

The I/Q digital output of the AR2300 represents the actual signal used after digital processing in the

receiver. The digital I/Q output interface streams I/Q data to the PC through USB2.0 isochronous

mode, with nearly 72Mbps.wide bandwidth.

A Windows XP/VISTA/7 device driver is provided free of charge for software developers, to allow

them to develop their own I/Q software, or to integrate the AR2300 I/Q acquisition feature to their

existing software..

2 SIGNAL FLOW

In the AR2300 circuitry, 45.05MHz of intermediate frequency (IF) is being sampled directly at 36MHz.

No AGC is applied at the preceding stage in order to obtain a digital signal with wider dynamic range.

The output of the ADC is digitally heterodyned to ZERO frequency to obtain an I/Q signal.

Thereafter, the I/Q signal is being filtered to limit the bandwidth and further down sampling for DSP

processing.

The USB2.0 is running at a top speed of approx. 100Mbps in isochroous mode in order to obtain

the continuous signal flow.

The I/Q output utilizes a CIC filter to simplify the circuit. And the signal flows through FIR Low Pass filter

for getting rid of the alias produced by the CIC filter. The signal is processed into 1MHz bandwidth and

1.125Msamples/sec.

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AOR AR2300 Specifications Page 53