请教NCO输出的jitter
时间：12-12
整理：3721RD
点击：
下面这段话里说的“输出clock的jitter是输入clock的一个周期”，怎么理解？
多谢
The Numerically Controlled Oscillator (NCO) is ideally suited for
this purpose. For some applications, the output reference
signal is a square wave, so the temptation is to use only the
MSB of the NCO output. This is useful in low frequency
applications such as motor controllers, but is inadequate for
most communications tasks. This is because the zero
crossings of this signal can vary by one period of the input
clock from one pulse to the next, which creates an
unacceptable amount of jitter in the output. For example, if
the NCO is clocked at 30MHz, the jitter is 33ns. For a 1MHz
square wave, this results in 12o of phase jitter.
多谢
The Numerically Controlled Oscillator (NCO) is ideally suited for
this purpose. For some applications, the output reference
signal is a square wave, so the temptation is to use only the
MSB of the NCO output. This is useful in low frequency
applications such as motor controllers, but is inadequate for
most communications tasks. This is because the zero
crossings of this signal can vary by one period of the input
clock from one pulse to the next, which creates an
unacceptable amount of jitter in the output. For example, if
the NCO is clocked at 30MHz, the jitter is 33ns. For a 1MHz
square wave, this results in 12o of phase jitter.