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or a real positive pole becomes dominant at with heavy load resistances R,. Having the possibility of controlling the gain of the current mirror M , the output impedance of the voltage buffer can he tuned. This can be achieved either by using a tunable current amplifier 131, or in a small range using the regulated cascode current mirror  with different regulation currents. 4th September 1992 1. Muchadoi:10.1049/el:19921328 fatcat:kgcakrk6obg2dm65746d2giyaa