A Further Note on the LinearSlope Delay Approximation
P. Gottwald · 1968
-- - The reason for the difference between (4) and Penfield and Sawyer's (45) is the thermal noise of the load resistance R,, which also contributes to the total output noise power of the photoparametric amplifier; therefore, in general, it also has to be taken into account. By connecting the photoparametric amplifier to the load by means of an impedance transformer and a circulator having a matched drain, '