Method for simulating a mixer in circuit simulators and the like
A method for operating a data processing system to simulate a mixer having an RF port, a LO port, and an IF port. In the present invention, the signal leaving the IF port is approximated by: b 2= f ( a 1, a 3 )+ S 22* a 2 where S22 is a constant, a 2 is a signal input to the IF port, a 1 is a signal input to said RF port and a 3 is a signal input to said LO port, and f ( a1 , a3 ) = ∑ i = o M ∑ j = o N C ij * a1 i * a3 j The coefficients C ij are constants that depend on said mixer design. These coefficients can be determined by measuring the b 2 when a 1 and a 3 are single tone signals. In addition, the coefficients can be determined by simulating said mixer on a non-linear circuit simulator when a 1 and a 3 are single tone signals.
1. A method for operating a data processing system to simulate a mixer having a known design, said mixer having an RF port, a LO port, and an IF port, said method comprising generating an estimate, b 2 , of the output signal leaving said IF port when an input signals a 1 , a 2 , and a 3 are applied to said RF port, said IF port, and said LO port, respectively wherein,
b 2 = f ( a 1 , a 3 )+ S 22* a 2
where:
S22 is a constant and,
f
(
a1
,
a3
)
=
∑
i
=
o
M
∑
j
=
o
N
C
ij
*
a1
i
*
a3
j
said coefficients C ij being contants that depend on said mixer design and wherein M and N are integers greater than 0.
2. The method of claim 1 wherein said coefficients C ij are determined by measuring a signal leaving said IF port when a 1 and a 3 are single tone signals.
3. The method of claim 1 wherein the coefficients C ij are determined by simulating said mixer on a non-linear circuit simulator and determining a signal leaving said IF port when a 1 and a 3 are single tone signals.