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Oh, I just thought maybe just a summer based upon resistorsa and an op-amp will do so?
A summer adds the two signals together, but not in the way you want. If you summed them as you proposed, you would end up with a 100KHz signal riding on a 1kHz signal. But you would not have a 101kHz signal. To get that requires a non-linear multiplier (mixer) circuit.Oh, I just thought maybe just a summer based upon resistorsa and an op-amp will do so?
No, a 'summer' wouldn't do it, as suggested a 'multiplier' is what's required, however it's not as complicated as it sounds. If you didn't want double balancing then almost anything will do, a transistor, a diode etc.
But a standard mixer isn't balanced, so you get out of it sum, difference, and BOTH inputs - so a double banacned mixer cancels out the original, something like an MC1496 would be fine.
A summer adds the two signals together, but not in the way you want. If you summed them as you proposed, you would end up with a 100KHz signal riding on a 1kHz signal. But you would not have a 101kHz signal. To get that requires a non-linear multiplier (mixer) circuit.
Any circuit/chip to get just one output as I want?
Nigel already told you a chip to use.
https://www.electro-tech-online.com/custompdfs/2010/09/mc1496-1.pdf
https://www.electro-tech-online.com/custompdfs/2010/09/mc1496apnote-1.pdf