Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1985-09-19
1989-04-11
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307264, 307448, H03K 19094, H03K 19092
Patent
active
048209376
ABSTRACT:
A TTL/CMOS compatible input buffer includes an input inverter and a reference voltage generator. In the TTL mode, the reference voltage generator supplies a reference voltage to the source of the P-channel transistor in the inverter having a magnitude which forces the trigger point of the input inverter to assume a preselected value. Typically the preselected value is selected to be 1.4 volts in order to maximize the input noise margins. A second stage input inverter introduces hysteresis to improve the noise immunity of the system. The reference voltage generator includes an operational amplifier connected to a voltage divider network. In the CMOS mode, the reference voltage generator is disabled and a voltage equal to power supply voltage is provided to the input inverter. As a result, the trigger point of input inverter is higher than 1.4 volts which provides a larger input noise margin. The voltage divider network and the operational amplifier are powered down so that no DC power is consumed.
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Xilinx, Incorporated
Zazworsky John
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