I am building a chopper amplifier to remove 1/f noise. I used ADG1436YRUZ as the modulator for the differential input; then modulated the differential signal is amplified and converted to single ended signal; then this signal and its inverted signal is passed through ADG1419BRMZ for demodulation. For current board, it still has 1/f noise, (around 1Hz). I will improve the clock distribution in next version. But I don't see any schematic mentioning using ADG analog mux as chopper switch. All of the article talking about using discrete NMOS for chopper switches. Is there problem for me to use ADG for this purpose?
I'm glad you found a solution. Just to note for ultra low charge injection you could also look at our ADG1208 family. The ADG1236 and ADG1219 are SPDT switches.