Query regarding the Verilog-A code given under "Modeling Oscillators with Arbitrary Phase Noise Profiles"

Dear All,

I was trying to understand the Verilog-A code given under "Modeling Oscillators with Arbitrary Phase Noise Profiles" .

( see the link  http://support.cadence.com/wps/myportal/cos/COSHome/viewsolution/!ut/p/a1/nY_LDoIwEEW_hQ8wnUKhsKyPgKWBqBhpNwYiMY28guDCrxeMiSs1cXYzOXNmLlIoRarObvqc9bqps3LqlXNc4xXBQQzc99gCGNAN34fYDKk9AnIE4EMx-LV_QOqJfDHI8QR9O1whPGB-6GwDmlgQU7Svm64an91NrlNRtELXFyT7biimybUphylONFR50SGJMaW24zovsR0sCXDAPJ6bFFiQEJ9EAkNs_i1uqxRmsnItW-d3ZhgPAm41FA!!/dl5/d5/L2dBISEvZ0FBIS9nQSEh/ )

I want to know the meaning of the two lines present in that verilog-A code:-  ( What they are meant for ?)

isource #(.type("sine"), .ampl(`pow2v(`dbm2pow(power),rout)/rout), .freq(freq) ) is1(gnd,out);

vsource #(.type("sine"), .ampl(`pow2v(`dbm2pow(power),rout)/rout), .sinephase(-90), .freq(freq) ) vs1(gnd,int);

The code is as below:-

`define db10_real(x) pow(10, (x)/10)

`define dbm2pow(x) `db10_real( ((x)-30) )

`define pow2v(x,r) sqrt(8*(r)*(x))

module oscwphnoise(out, ph);

inout out;

input ph;

electrical out;

electrical ph;

electrical gnd;

ground gnd;

electrical int;

parameter real power = 10 ;

parameter real rout = 50 ;

parameter real freq = 1e+09 ;

isource #(.type("sine"), .ampl(`pow2v(`dbm2pow(power),rout)/rout), .freq(freq) ) is1(gnd,out);

vsource #(.type("sine"), .ampl(`pow2v(`dbm2pow(power),rout)/rout), .sinephase(-90), .freq(freq) ) vs1(gnd,int);

analog begin

I(out) <+ -V(int)*V(ph);

I(out) <+ V(out)/rout;

end

endmodule