Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-10-03
1987-02-10
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307352, 307262, 328133, 328155, 328 26, H03K 526, H03K 5159, H03K 500
Patent
active
046424890
ABSTRACT:
A sampled data phase detector is created using a differential amplifier that is provided with a feedback capacitor connected between the output and the inverting input. A reference potential is coupled to the noninverting input. A coupling capacitor is connected between the inverting input and a sampling switch that switches the coupling capacitor alternately between ground and a circuit input terminal. A second switch alternately shorts out the feedback capacitor at the clock rate during the time interval the input capacitor is grounded. In this state both inputs and the output are forced to the reference potential. On the other half of the clock cycle the amplifier input is coupled to sense the data signal. The result is a rectified version of the data signal appearing at the amplifier output. The d-c level of this signal is related to the amplitude and phase of the data signal. A full wave version of the circuit is also disclosed.
REFERENCES:
patent: 4109308 (1978-08-01), Rodel
patent: 4297642 (1981-10-01), Baldwin et al.
patent: 4329599 (1982-05-01), Gregorian et al.
patent: 4355285 (1982-10-01), Kelley et al.
patent: 4439693 (1984-03-01), Lucas et al.
patent: 4453130 (1984-06-01), Bennett
patent: 4521743 (1985-06-01), Heimer
Callahan Timothy P.
Heyman John S.
National Semiconductor Corporation
Winters Paul J.
Woodward Gail W.
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