rampgen的输入频率是什么频率，

typedef struct { _iq Freq; // Input: Ramp frequency (pu)
_iq StepAngleMax; // Parameter: Maximum step angle (pu)
_iq Angle; // Variable: Step angle (pu)
_iq Gain; // Input: Ramp gain (pu)
_iq Out; // Output: Ramp signal (pu)
_iq Offset; // Input: Ramp offset (pu)
} RAMPGEN;

/*------------------------------------------------------------------------------
Object Initializers
------------------------------------------------------------------------------*/
#define RAMPGEN_DEFAULTS {0, \
0, \
0, \
_IQ(1), \
0, \
_IQ(1), \
}

/*------------------------------------------------------------------------------
RAMP(Sawtooh) Generator Macro Definition
------------------------------------------------------------------------------*/

#define RG_MACRO(v) \
\
/* Compute the angle rate */ \
v.Angle += _IQmpy(v.StepAngleMax,v.Freq); \
\
/* Saturate the angle rate within (-1,1) */ \ 为什么限定在-1到1？  _IQ(1.0)表示什么意思？
if (v.Angle>_IQ(1.0)) \
v.Angle -= _IQ(1.0); \
else if (v.Angle<_IQ(-1.0)) \
v.Angle += _IQ(1.0); \
v.Out=v.Angle;

// Use the code snippet below if gain/offset needed. \
/* Compute the ramp output */ \
v.Out = _IQmpy(v.Angle,v.Gain) + v.Offset; \
/* Saturate the ramp output within (-1,1) */ \为什么限定在-1到1？
if (v.Out>_IQ(1.0)) \
v.Out -= _IQ(1.0); \
else if (v.Out<_IQ(-1.0)) \
v.Out += _IQ(1.0);

#endif // __RAMPGEN_H__