| 摘要 |
PURPOSE:To perform a high-resolution sampling with a low frequency, by inserting a PLL circuit between a frequency divider and a circuit to be measured. CONSTITUTION:The output of a pulse generator 1 which generates pulses having a repeat period T is connected directly to the input of a sample holding circuit 5, and a PLL circuit consisting of a frequency divider 3, a phase detector 6, and a voltage control oscillator (VCO) 7 is inserted between a frequency divider 2 and a circuit 4 to be measured. The repeat period of the output of the VCO 7 is set to NT/M, and this output is supplied to the circuit 4 to be measured. The phase detector 6 detects the phase defference between an output NT of the frequency divider 2 and the output NT of the frequency divider 3 and performs such control that the output NT/M of the VCO 7 is constant. N=MXK-A is true in the relation between M and N. A, K, M, and N are integers, and A is equal to or larger than 1, and K is a constant, and values of M and N are so set that N/M is not an integer. |
