A DPRAM is placed in the RF path before the digital to analog converter, to provide dynamic path gain compensation to the digital signal prior to conversion to an analog signal. The DPRAM stores corrections to the signal to compensate for amplitude losses in the signal arising from heat and non-linearities. The DPRAM has two sets of identical addresses. A logic switch, alternately directs an input signal to one of the two sets of addresses. Pre-calculated signal values which compensate for path gain are stored in one of the two sets of addresses in the DPRAM. The signal input to the DPRAM is directed to the other block. The value of the signal input to the DPRAM will determine the address to which the new value can be found. It is this new value which is actually input to the DAC and from which an analog signal is created. The updated values written to the DPRAM are the signal values with path gain compensation that is independently calculated and applied to the RF signal by a Dynamic Path Gain Compensation Controller ("DPGCC"). The DPGCC may apply any known algorithms to compute the path gain compensation and adjust the signal accordingly. In one advantageous embodiment the DPGCC accounts for thermal losses and non-linearity and takes into consideration overdrive protection constraints.

Use of amorphous perfluorinated polymers for preparing transparent films at 157 nm, said perfluorinated polymers being free from unstable ionic end groups COF, COOH or their amidic derivatives, esters or salts, said polymers formed by cyclic units deriving from perfluorodioxoles of formula: ##STR00001## wherein R'.sub.F is equal to R.sub.F or OR.sub.F wherein R.sub.F is a perfluoroalkyl radical having 1 5 carbon atoms; X.sub.1 and X.sub.2, equal to or different from each other, are F, CF.sub.3; said polymers optionally containing units deriving from perfluorinated comonomers optionally containing oxygen atoms; in said polymers the cyclic units deriving from the perfluorodioxoles of formula (IA) being .gtoreq.95% by moles.

Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): ##STR00001## wherein R'.sub.F is equal to R.sub.F or OR.sub.F wherein R.sub.F is a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; X.sub.1 and X.sub.2, equal to or different from each other, are F, CF.sub.3; said polymers having a dioxole content.gtoreq.95% by moles, having the following property combination: Tg, measured according to the ASTM 3418 (DSC) method, from 180.degree. C. to 195.degree. C.; intrinsic viscosity, measured at the temperature of 30.degree. C. in perfluoroheptane (Galden.RTM. D80) according to the ASTM D 2857-87 method, from 13 cc/g to 100 cc/g.

Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): ##STR00001## wherein R'.sub.F is equal to R.sub.F or OR.sub.F wherein R.sub.F is a linear or branched perfluoroalkyl radical having 1 5 carbon atoms; X.sub.1 and X.sub.2, equal to or different from each other, are F, CF.sub.3; said polymers having a dioxole content .gtoreq.95% by moles, having the following property combination: Tg, measured according to the ASTM 3418 (DSC) method, from 180.degree. C. to 195.degree. C.; intrinsic viscosity, measured at the temperature of 30.degree. C. in perfluoroheptane (Galden.RTM. D80) according to the ASTM D2857-87 method, from 13 cc/g to 100 cc/g.