PLL automatic test circuit and test method
An automatic test and circuit technology, applied in the direction of measuring electricity, measuring electrical variables, electronic circuit testing, etc., can solve the problems that cannot be completed automatically, the test results need manual observation, and cannot cover the working range of PLL, so as to save risks and workload , Avoid the effect of incomplete test coverage
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[0024] Such as figure 1 As shown, the PLL automatic test circuit of the present invention includes a frequency configuration storage unit 101, a frequency configuration unit 102, a path selection unit 103, a lock detection unit 104, a counter unit 105, a comparison unit 106 and an expected value storage unit 107; Unit 101, frequency configuration unit 102, path selection unit 103 are connected to the PLL in turn; and the frequency configuration unit 102 and path selection unit 103 are all connected to the test mode valid status bit signal; the path selection unit 103 is also connected to the Configure the control signal; the lock detection unit 104, PLL, counter unit 105, comparison unit 106 and expected value storage unit 107 are connected in sequence; the lock detection unit 104 is also connected to the counter unit 105, the comparison unit 106; the PLL, counter The unit 105 is also connected to the reference clock signal; the comparison unit 106 is also connected to the fre...
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