Bias Current Generator

a current generator and bias technology, applied in pulse generators, pulse techniques, instruments, etc., can solve the problems of requiring a lot of chip area for resistors with such high resistance, affecting the power supply of the generator, and limiting the range and flexibility of vsub>be /sub>be, etc., to achieve less chip area and less power consumption.

Active Publication Date: 2009-02-12
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect that this patented technology solves by providing circuits on small devices can generate more heat without consuming too much energy compared to previous designs.

Problems solved by technology

Technics Problem: Integral Electronic Circuitries require various types of bias currents/voltage sources that can affect their performance at different temperatures depending on how well they work properly. These factors include changes caused by external conditions like heating from sunlight hitting certain parts inside the system; variations due to agitation during shipment or handling processes where the integrated electronics may move around within them; and differences between expected operating environments and actual environmental circumstances. To address this problem, some solutions use resistors made up entirely of materials called PCTs instead of traditional semiconductor devices.

Method used

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Examples

Experimental program
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Embodiment Construction

[0013]FIG. 1 shows a simplified block diagram of an NTC current generator according to the prior art. Bipolar transistor T1 has a base to emitter voltage VBE. The transistor receives a bias current Ibias from a constant current source. The base to emitter voltage VBE is coupled to the positive input of a differential amplifier AMP. The output of the amplifier AMP is coupled to the gates of PMOS transistors P1 and P2. The source of PMOS transistor P1 is coupled to a supply voltage VCC and its drain is coupled to the negative input of the amplifier AMP and a resistor R. Due to the feedback connection of the amplifier AMP, the base to emitter voltage VBE of bipolar transistor T1 also appears across resistor R. The output current ICTAT at PMOS transistor P2 is used for further biasing purposes having the desired temperature coefficient (TC). The TC of the output current ICTAT can be negative. However, the NTC can also be partially compensated or completely compensated by a PTC of the resis

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Abstract

An electronic device generates a current with a predetermined temperature coefficient. The circuit comprises a temperature coefficient (TC) component receiving a bias current, a differential amplifier providing a buffered output voltage based on the voltage across the TC component and a resistor receiving an TC current based on the differential amplifier output voltage. The differential amplifier has a predetermined input related offset which decreases the voltage drop across the resistor. The temperature coefficient component could have either a negative temperature component (NTC) or a positive temperature component (PTC).

Description

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Claims

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Application Information

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Owner TEXAS INSTR INC
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