Browse Prior Art Database

Constant Current Source Network

IP.com Disclosure Number: IPCOM000073806D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Baitinger, UG: AUTHOR [+3]

Abstract

A network generates a gate voltage for FET circuits as a function of the particular threshold voltage of the involved FET devices. An on-chip derivation of the gate voltage can be performed and an independence from process dependent tolerance variation is achieved.

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Constant Current Source Network

A network generates a gate voltage for FET circuits as a function of the particular threshold voltage of the involved FET devices. An on-chip derivation of the gate voltage can be performed and an independence from process dependent tolerance variation is achieved.

Referring to the drawing, the voltage V1 in Fig. 1 is a function of the threshold voltage Vth as shown in Fig. 1A. The voltage V3 is independent of Vth as shown in Fig. 1B. The voltage V4 is a function of the voltage Vth as shown in Fig. 1C. The voltage V4 is then applied to the gate of the FET device T7. The resulting current through the load and T7 is independent of the threshold voltage Vth. Fig. 2 shows a similar arrangement wherein the voltage divider R1, R2 is substituted for the transistors T1, T2, T3, T4 in Fig. 1.

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