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Temperature Compensated On-chip Power System

IP.com Disclosure Number: IPCOM000049730D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Heimeier, HH: AUTHOR [+4]

Abstract

A temperature-compensated on-chip power system is described which consists of three partial circuits, a reference voltage generator, a voltage follower, and a distribution system.

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Temperature Compensated On-chip Power System

A temperature-compensated on-chip power system is described which consists of three partial circuits, a reference voltage generator, a voltage follower, and a distribution system.

The figure shows the circuit diagram. In the left part, the reference voltage generator is shown. This generator essentially consists of a bandgap reference voltage generator (T1 - T4, R1 - R3, C1) which, as a result of being suitably dimensioned in a known manner, supplies a temperature-independent voltage of 1.2 V at its output O. Transistors T1 and T2, serving as a load for amplifier T3 of the bandgap reference voltage generator, are decoupled by emitter follower 14. Capacitance C1 serves to suppress oscillations, if any.

Transistor 15, wired to form a diode, determines the temperature coefficient of the output voltage of the reference voltage generator.

The degree of temperature dependence may be influenced by suitably selecting the current density in transistor T5. By means of the voltage divider consisting of resistors R4 and R5, the output voltage of the reference voltage generator is reduced to the desired value and fed to the voltage follower shown in the center of the figure, in order to make the chip internal supply voltage independent of the load.

The voltage follower consists, amongst others, of differential amplifier T6, T7 and feedback loop T8, T9. Transistor 18 also serves as a driver transistor for the power distribution syst...