Transistors used in DSP, Microprocessors and Microcontrollers

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Discussion Overview

The discussion revolves around the differences between digital signal processors (DSPs) and microprocessors, as well as the types of transistors used in these devices, specifically focusing on BJTs and MOSFETs. The scope includes technical explanations and comparisons of transistor performance in various applications.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • Some participants inquire about the differences between DSPs and microprocessors, suggesting that DSP may simply refer to digital signal processing without significant technological distinctions.
  • There is a question regarding which type of transistor is more commonly used in these devices, specifically whether BJTs or FETs are preferred.
  • One participant argues that MOSFETs are advantageous due to their faster switching capabilities and lower current draw compared to other transistors.
  • Another participant notes that while MOSFETs can switch faster than BJTs, they may draw more current at high speeds due to the drive requirements for input capacitance and current surges during transitions.
  • There is a suggestion that the differences in power consumption between CMOS and BJT ICs at certain switching speeds should be considered.

Areas of Agreement / Disagreement

Participants express differing views on the distinction between DSPs and microprocessors, with some suggesting no significant difference while others imply there may be more to explore. The discussion on transistors also reflects competing perspectives on their performance characteristics.

Contextual Notes

Some claims regarding power consumption and switching speeds depend on specific conditions and assumptions that are not fully detailed in the discussion.

pairofstrings
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how is dsp different from devices which contain microprocessors?
 
Last edited:
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Which transistor in action. Is it BJT, FET? And why?
 
MOSFETs. They switch faster and draw less current than other types of transistors.
 
MOSFET can be much faster because it does not go into saturation( forward forward biasing) like the BJT, even the schottky can only speed up so much.

BUT at high speed, MOSFET draw even more current than BJT because of the drive that needed to drive the input capacitance of the gate and the current surge at the transition where both the transistor of the complementarity pair turn on . Look at the Icc vs speed of switching and you'll see at certain switching speed, CMOS draw more power than BJT ICs.
 
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There should be no difference. DSP is digital signal processing, that is far as my understanding unless there is other meaning after I left the industry! If so, that is only a name, has nothing to do with the technology.
 
pairofstrings said:
how is dsp different from devices which contain microprocessors?

pairofstrings said:
Which transistor in action. Is it BJT, FET? And why?

You need to show some effort before we can offer tutorial help. I've moved your posts from EE to Homework Help where they belong. In the future, please do some research and show some effort in your schoolwork questions here.
 

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