Controlled Sine Wave Oscillator

This function is a controlled sine wave oscillator with parameterizable values of low and high peak output. It takes an input voltage or current value. This value is used as the independent variable in the piecewise linear curve described by the coordinate points of the cntl_array and freq_array pairs. From the curve, a frequency value is determined, and the oscillator will output a sine wave at that frequency. From the above, it is easy to see that array sizes of 2 for both the cntl_array and the freq_array will yield a linear variation of the frequency with respect to the control input. Any sizes greater than 2 will yield a piecewise linear transfer characteristic. For more detail, refer to the description of the piecewise linear controlled source, which uses a similar method to derive an output value given a control input.

 Alternatively to the pair of parameters cntl_array and freq_array it is possible to determine the frequency of the VCO using the pair of parameters FC and KF.

Port Table

Description Direction Default Type Allowed Types Vector Vector Bounds Null Allowed
Input IN v v,vd,i,id,vnam NO   NO
Output OUT v v,vd,i,id NO   NO

Parameter Table

Name Description Data Type Default Value Limits Vector Vector Bounds Null Allowed
cntl_array control in array Real 0.0   YES 2 / - YES
freq_array frequency array Real 1.0e3 0 / - YES 2 / - YES
FC center Frequency Real 1.0e6   NO   YES
KF frequency sensitivity in Hz/Volt Real 1.0e5   NO   YES
out_low output low value Real -1.0   NO   YES
out_high output high value Real 1.0   NO   YES

Error Messages

SINE: Error allocating sine block storage

Generic storage allocation error.

SINE: Extrapolated frequency limited to 1e-16 Hz

This error occurs whenever the controlling input value is such that the output frequency ordinarily would be set to a negative value. Consequently, the output frequency has been clamped to a near-zero value.

SINE: Size of control array different than frequency array

This error message normally occurs whenever the controlling input array and the frequency array are different sizes.


asine 1 2 in_sine
.model in_sine sine(cntl_array = [-1 0 5 6]
+                   freq_array =[10 10 1000 1000] 
+                   out.low = -5.0 out.high = 5.0)

See also

XSPICE Devices
XSPICE Code Models