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All npn-transistor ptat current source

A technology of absolute temperature and current source, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc.

Inactive Publication Date: 2007-11-07
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the known PTAT current sources have the disadvantage of requiring both n-type and p-type transistors

Method used

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  • All npn-transistor ptat current source
  • All npn-transistor ptat current source
  • All npn-transistor ptat current source

Examples

Experimental program
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Embodiment Construction

[0028] Figure 1 is a simplified schematic circuit diagram illustrating the general principles of the invention. The circuit for generating a current proportional to absolute temperature comprises a first current path 10 and a second current path 20 connected in parallel with the first current path 10 . There is also a proportional to absolute temperature (PTAT) current path 30 in parallel with the first current path 10 and the second current path 20 . The first current path 10 comprises a first resistive element R1 and a first transistor arrangement T1 coupled at a first node N1. The second current path 20 comprises a second resistive element R2 and a second transistor arrangement T2 coupled at a second node N2. The PTAT current path includes a first current source I1, a second current source I2, and a resistor R, and the resistor R, as a current sensitive element, is coupled to the first current source I1 and the second current source I2 at the third node N3 and the fourth n...

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PUM

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Abstract

The present invention relates to an improved PTAT current source and a respective method for generating a PTAT current. Opportune collector currents are generated and forced in two transistors exploiting the logarithmic relation between the base-emitter voltage and the collector current of a transistor. A resistor senses a voltage difference between the base-emitter voltages of the two transistors, which can have either the same or different areas. A fraction of the current flowing through the resistor is forced into a transistor collector and mirrored by an output transistor for providing an output current. By this principle an all npn-transistor PTAT current source can be provided that does not need pnp transistors as in conventional PTAT current sources. The invention is generally applicable to a variety of different types of integrated circuits needing a PTAT current reference.

Description

technical field [0001] The invention relates to a circuit according to claim 1 . Background technique [0002] Current reference circuits are well known circuits that are widely used in a wide range from A / D converters and D / A converters to voltage regulators, memories and bias circuits. The heaviest of the current reference circuits is the so-called proportional to absolute temperature (PTAT) current source, which produces a current that varies linearly with temperature. Fig. 8 shows a simplified general PTAT current source scheme, which can be found, for example, in H.C Nauta and E.H Nordholt, "New class of high-performance PTAT currentsources", (Electron. Lett, vol.21, pp.384-386, Apr.1985 ) found in . [0003] The basic concept of this PTAT reference circuit is based on two npn-transistors and a resistor R. Equal currents are supplied to transistors T1 and T2, which are generated by a current mirror formed by two npn-transistors T4 and T3. Therefore, equal collector ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/22H10N10/00
CPCG05F3/262
Inventor 洛伦佐·特里波迪米哈伊·A·T·桑杜利努彼得·G·布兰肯
Owner NXP BV
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