Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-08-17
1994-02-08
Wambach, Margaret R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307578, 307607, 328155, 331 17, H03K 17687, H03K 513
Patent
active
052851141
ABSTRACT:
A charge pump in a phase lock loop equalizes the charge and discharge currents flowing into the filter capacitor independent of the loop node voltage for providing a linear VCO output frequency. The potential at the output of the charge pump determines whether the charging/discharging current is decreased or increased. An active up control signal to increase VCO output frequency and a low level potential at the output of the charge pump limits the charging current to the loop filter while increasing the discharge current. An active down control signal to decrease the VCO output frequency and a high potential at the output of the charge pump limits the discharging current while increasing the charge current. The voltage change at the output of the charge pump in response to the up control signal is made equal to the voltage change during the down control signal for providing equal charge and discharge currents to the loop filter independent of the loop voltage.
REFERENCES:
patent: 4910713 (1990-03-01), Madden et al.
Atriss Ahmad H.
Peterson Benjamin C.
Atkins Robert D.
Codex Corp.
Wambach Margaret R.
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