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Symmetricom 6502 distribution amplifier

A look inside the symmetricom 6502 frequency distribution amplifier.

Input stage is based on LMH6702 http://www.ti.com/lit/ds/symlink/lmh6702.pdf.

Output stage is based on LMH6609 http://www.ti.com/lit/ds/symlink/lmh6609.pdf

PDF of sketched schematic, based on the photos: 6502B_schematic_v2

I measured the phase-noise at 10MHz earlier. This amplifier has a far-out phase-noise floor of around -163 dBc/Hz.

sketch of input stage schematic.

sketch of output stage schematic. this is repeated 10 times.

output-spectrum up to 100 MHz.

output spectrum up to 500 MHz

Overview. Transformer and linear regulators at the bottom. Two input BNCs top left with the input stage. Ten output stages after that.

One output stage.

-3dB measured to be about 30 MHz.

Input stage.