PLL loop filter capacitor test circuit and method for on...

Details PLL loop filter capacitor test circuit and method for on... PLL loop filter capacitor test circuit and method for on...

2006-07-18

2006-07-18

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C324S763010

Reexamination Certificate

active

07078887

ABSTRACT:
A test circuit within an existing design to enable the test circuit to test directly within the circuit. This invention provides a way to test and measure the leakage of the PLL loop filter capacitor leakage during test with a simple digital tester using existing pins. The test PLL circuit has circuit a plurality of capacitors and responsive amplifiers circuits for measuring leakage including a first capacitor set having multiple transistors coupled in series and with a reference resistor circuit coupled to a first amplifier and a second capacitor set having multiple transistors coupled in series and said reference resistor circuit coupled to a second amplifier to measure the leaking across the respective capacitors coupled to said first and second amplifiers and to provide an output of the leakage for measurement with the output of said first and second amplifiers. The reference resistor circuit is broken into several series resistors and additional transistors and resistors are supplied with their terminals shorted out, to allow for RIT-B circuit tuning. The output of the test circuit provides the measurement of analog leakage to a digital tester for testing of chips having the circuit during manufacturing test.

REFERENCES:
patent: 5973571 (1999-10-01), Suzuki
patent: 6832173 (2004-12-01), Starr et al.

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