DC2645A

Demonstration circuit 2645A showcases the LTC®5594 300MHz to 9GHz high linearity I/Q demodulator with wideband IF amplifiers. The USB serial controller, DC590B is required to control and configure LTC5594 for its evaluation. The DC2645A’s single-ended RF input is optimized for 500MHz to 9GHz and can be easily modified for lower frequency evaluations down to 300MHz. Its single-ended LO input is programmable for 300MHz to 9GHz operation via SPI bus. The demo circuit includes discrete L-C interstage lowpass filters between the demodulator outputs and the IF amplifier inputs, which limits the DC-coupled differential I and Q outputs to about 1GHz. By writing to specific registers through SPI bus, LTC5594’s IF amplifier gain, LO input frequency, output DC offset, image rejection, and linearity can be adjusted or optimized.

Notes

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