Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate
2007-02-20
2007-02-20
Anderson, Matthew D. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
C455S067140, C455S226100, C455S255000
Reexamination Certificate
active
10114698
ABSTRACT:
A loop-back self-test circuit (10) that has particular application for a cellular telephone base station, where the components of the self-test circuit (10) are integrated on a common integrated circuit chip (20). The transmit signal and an LO signal are applied to a mixer (28) to convert the frequency of the transmit signal to the frequency of a receive signal. A VCO (56) generates the LO signal and a PLL (26) synchronizes the phase of the VCO signal to the phase of a reference signal. A divided reference signal and a divided VCO signal are applied to a phase comparator (52) that generates an error signal indicative of the phase difference between the reference signal and the VCO signal. The error signal is applied to a charge pump (60) that generates a current signal to tune a tank circuit (66). A voltage signal from a loop filter (62) is applied to the VCO (56) to tune it to the LO frequency.
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Vaucher, C.S., “An Adaptive PLL Tuning System Architecture Combining High Spectral Purity and Fast Settling Time”, IEEE Journal of Solid-State Circuits, IEEE Inc., New York, US. vol. 35, No. 4, Apr. 1, 2000, pp. 490-502.
Chu Peter F.
Goyette William R.
Grant Jeffrey A.
Simmons, Jr. Willie O.
Anderson Matthew D.
Miller John A.
Northrop Grumman Corporation
Warn, Hoffmann, Miller & LaLone, P.C.
Yun Eugene
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