sine wave (input, output) code segment

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sine wave ( input, output) code segment

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module vco(in, out) ; 
`define  M_PI  3 
parameter real amplitude = 1.0, centre_frequency = 1K, gain = 1K ; 
parameter integer steps_per_cycle=20 ; 
localparam real omegac = 2.0 * `M_PI * centre_frequency, omega_gain = 2.0 * `M_PI * gain ; 
 
electrical in, out ; 
 
analog begin : main 
 
real vin, instantaneousFreq ; 
 
vin = V(in) ; 
V(out) <+ amplitude*sin(idt(vin*omega_gain+omegac,0.0)) ; 
 
// Use $bound_step system task to limit time step 
// This is to ensure that sine wave is rendered with 
// adequate detail. 
instantaneousFreq = centre_frequency + gain * vin ; 
$bound_step (1.0 / instantaneousFreq / steps_per_cycle) ; 
end 
endmodule
 
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