1. Yes, and the advantage of analog is significantly reduced as well, as a binary multiply and add then reduce to single gate operations. 2. Switched capacitor

1. Yes, and the advantage of analog is significantly reduced as well, as a binary multiply and add then reduce to single gate operations. 2. Switched capacitor multipliers (actually almost anything analog) have difficulty scaling with feature shrinks, and that's before considering noise. E.g. see all the difficulties Xilinx went through to get 16nm FinFET ADCs efficiently working.