
The following worksheets require the use of Mathcad software by Mathsoft, Inc. Save the file using the supplied name, then open it in Mathcad to perform the calculations. 

Design



harlep.mcd (31 k Mathcad file):
This worksheet calculates the transfer curve of a Schottky diode detector (without matching circuit, zero frequency) at any temperature. It is based upon the work of Harrison & LePolozec.



largesig.mcd (32 k Mathcad file):
Large signal version of harlep.mcd, useful for the design of detectors which operate over the range of 15 to +20 dBm (such as AGC circuit detectors).



pi_attn.mcd (86 k Mathcad file):
Calculates attenuation and return loss vs. bias voltage for three versions of the 4diode Pi attenuator described in Application Note 1048.



p_diss.mcd (25 k Mathcad file):
Calculates the junction temperature of a diode, given the ambient temperature, DC bias current, RF power dissipated in the diode, diode and package type.


Characterization



pin_char.mcd (23 k Mathcad file):
Calculates the two APLAC parameters (n and Is) from four pairs of forward VI data. Also calculates Rs, needed to plot the VI curve using pin_vi.mcd.



pin_vi.mcd (22 k Mathcad file):
Plots the forward VI curve of a PIN diode, given n, Is and Rs.



schottky.mcd (28 k Mathcad file):
Plots the VI curve for any Schottky diode at any temperature. Calculates maximum safe current.



sch_char.mcd (24 k Mathcad file):
This worksheet is used to characterize a Schottky diode (series resistance, ideality factor, saturation current), given five VI data pairs.



zbs_char.mcd (26 k Mathcad file):
Characterizes the junction resistance and junction capacitance of a zero bias Schottky diode.


General



_g_to_z.mcd (19 k Mathcad file):
Converts S11 or complex reflection coefficient to complex impedance.



_z_to_g.mcd. (19 k Mathcad file):
Converts complex impedance to S11 or complex reflection coefficient.



r_and_c.mcd (33 k Mathcad file):
Calculates series or shunt resistance or capacitance, given a value of attenuation and frequency.
