Yes, I posted a circuit here a while back that used low-leakage diode from signal to a 4.3V voltage at low source impedance, by running several mA through the zener.
This let me reduce the signal series resistor to 1k (I think) and thus have little effect on the signal integrity (eventually goes to a dual slope converter, so more noise not an issue here). In my case I'm protecting the input of a
+/- 5V powered CMOS device (4052) from an opamp powered from +12V/-5V's output, in order to get clean, accurate signal performance from -3V to 5V. No clamp for -ve signal as opamp and cmos use same -ve supply.Point is to make the clamp voltage low impedance so it absorbs the over-voltage, not let CMOS diodes pump up the supply rails, which is a Bad Thing.
Grant.