db()

Returns the decibel measure of a voltage ratio

Syntax
y = db(r, z1, z2)

Arguments

Name	Description	Range	Type	Default	Required
r	voltage ratio (vOut/vIn)	(-∞, ∞)	integer, real, complex		yes
z1	source impedance	(-∞, ∞)	integer, real, complex	50.0	no
z2	load impedance	(-∞, ∞)	integer, real, complex	50.0	no

Examples

y = db(100)
returns 40
y = db(8-6*j)
returns 20

Defined in

Built in

See Also

dbm(), pae()

Notes/Equations

dbValue = 20 log(mag(r)) - 10 log(zOutfactor/zInfactor)
zOutfactor = mag(z2)**2 / real (z2)
zInfactor = mag(z1)**2 / real (z1).