Digital frequency control circuit, phase control circuit, pll circuit
A phase control circuit and circuit technology, applied in the direction of automatic power control, electrical pulse generator circuit, and logic circuit to generate pulses, etc., can solve the upper limit of sampling frequency, digital calculation and processing range limitation, etc., to achieve improved accuracy Effect
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no. 1 example
[0059] Fig. 1(A) shows a digital PLL circuit in a first embodiment according to the present invention.
[0060] This circuit is provided with a digital frequency control circuit 10, a digital phase control circuit 20, and an oscillation circuit 30.
[0061] The first feature of this digital PLL circuit is that it uses an oscillating circuit 30 as shown in Fig. 1(B), which outputs a signal whose period T can be expressed as a linear function of the control input value S . For example the period T is expressed as
[0062] T=k(S-Sc)+Tc, (1)
[0063] Among them, k, Sc and Tc are constants.
[0064] The oscillation frequency fo of the oscillation circuit 30 is expressed as
[0065] fo=1 / T. (2)
[0066] The oscillating circuit can be constructed in such a way that the input of an inverter is connected via a delay circuit to the output of an inverter, so that the time delay of this delay circuit is adjusted corresponding to the value S of the control input. An example of this i...
no. 3 example
[0141] Fig. 13 shows a digital PLL circuit according to the present invention in a third embodiment.
[0142] In the digital frequency control circuit 10B, by loading -Tc / K+Sc to the counter 12 instead of clearing the counter 12, the calculation circuit 13 in FIG. 1(A) is omitted.
[0143] In other respects, the third embodiment is the same as the first embodiment.
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