However, if the 
, we may also treated the device as unilateral for the
design. If we assume 
for a non-unilateral device, what is the amount of error
resulting from gain calculation? The transducer power gain of a non-unilateral device is
Hence the bounds of the ratio between the actual transducer power gain and the transducer gain when treating
the device as unilateral is
If we use complex conjugated matching 
, 
for both terminals. The bounds become
Example if U=0.1 then the error is less than 
1 dB. If the error is acceptable, we may
apply the design procedures in unilateral design for an unconditionally stable device such that
calculation can be simplified.