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Browse Prior Art Database

Series Bandgap Cell Regulator

IP.com Disclosure Number: IPCOM000089106D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Azzis, D: AUTHOR

Abstract

The drawing shows an integrated circuit regulator of the series type comprising easily integrable components wherein the geometry and current matching properties achieved by integrated circuit technology are used.

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At least one non-text object (such as an image or picture) has been suppressed.
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Series Bandgap Cell Regulator

The drawing shows an integrated circuit regulator of the series type comprising easily integrable components wherein the geometry and current matching properties achieved by integrated circuit technology are used.

The supply voltage V(IN) to be regulated is provided on terminal 1 and the regulated output voltage V(OUT) is generated on terminal 2. The regulator comprises bandgap cell circuit B, current mirror M, amplifier A, current limiting circuit L and start-up circuit S.

The bandgap cell circuit B, comprising transistors T1, T2 and T3 and resistors R1, R2 and R3, receives currents i and hi on branches 3 and 4. Currents i and lambda i are provided by current mirror M, comprising transistors T4 to T8.

According to the bandgap principle, voltage V(OUT) depends on temperature and lambda, consequently lambda is adjusted so that the V(OUT) temperature coefficient is null.

Amplifier A, comprising transistors T9 to T11, maintains voltage V(OUT) constant and provides high output current for the load. Transistors T11 and T12 constitute a voltage follower which provides a high input impedance.

Start-up circuit S, comprising resistors R4, RS and R6 and transistors T13 and T14, provides an initial bias for transistors T9 and T10 of amplifier A. Under normal conditions, transistor T14 saturates so that this start-up circuit is disabled.

Current limiter L, comprising transistor T15 and resistor R7, insures that, for large output current, the cur...