INT-9501
Hand Held Spectrum Analyzer
Overview
The INT-9501 provides
the capabilities of a small hand held spectrum analyzer by displaying
the frequency domain power spectra of the input signal on its LCD
display. Pan and zoom controls allow the user to vary the center
frequency and displayed bandwidth to a resolution of 1 KHz.
The unit samples the
video input signal at 16.384 MSPS to 8 bits and stores 16k continuous
samples in high speed FIFO memory for subsequent retrieval and
analysis by its on card DSP processor. A DSP microcomputer implements
signals processing algorithms to compute the selected power spectra to
display on the LCD. Six AA batteries with an operating life of 5 hours
power the unit. Small physical size is essential, and the design uses
surface mounted small outline integrated circuits for this purpose.
The INT-9501 accepts
video input signals via SMA connector. The input must be band limited
DC - 8192KHz, at a maximum level of 0.6v pp. Input signals are
buffered using an Analog Devices AD9617 op amp and applied to an
Analog Devices AD9020 analog to digital converter. The AD9020
digitizes the video input to 8 bits with a SNR of 40 dB minimum at
16.384 MSPS. The digitized video is clocked directly from the AD9020
into an IDT7206 FIFO, which provides storage for 16,384 samples
An Analog Devices
AD2101 DSP serves as the central processing element. A 16Kx24 program
memory RAM and 7 pages of 16Kx16 data memory RAM using Sharp LH21008K
or equivalent SRAMs are available. The serial interface conforms to
RS-232 signal levels and operates full duplex at up to 19,200 bps. The
PCMCIA and serial interfaces are unused at the present time