High-speed supply independent level shifter

Details High-speed supply independent level shifter High-speed supply independent level shifter

1987-01-12

1988-08-30

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307296R, 307491, 330258, 330277, 330310, 330296, H03K 502, H03K 508

Patent

active

047679468

ABSTRACT:
A high-speed, supply independent level shifter is implemented in bipolar, JFET, MOSFET or MESFET integrated circuit technology. A level shift circuit having a desired input potential V.sub.1 and a required output potential V.sub.2, is incorporated into a first current leg connected between first and second supply voltages. A second current leg in parallel with the first leg establishes a reference current. The two current legs are coupled by a current mirror to establish a fixed, preferably equal, relationship between the currents in the two legs. Each current leg includes a reference resistor. A buffered, floating voltage source is coupled in series with the resistor in the first leg to the control conductor of the current mirror. The voltage source is designed and the resistor values selected to provide a potential V.sub.3 that is an additive function of potentials V.sub.1 and V.sub.2 such that V.sub.1 is independent of the supply voltages.

REFERENCES:
patent: 4456838 (1984-01-01), Taguchi et al.
patent: 4578602 (1986-03-01), West et al.
patent: 4644194 (1987-02-01), Birrittella et al.

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