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Design >> Analog Design >> mosfet as current source
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Message started by aman gupta on Jul 24^th, 2013, 5:25am

Title: mosfet as current source
Post by aman gupta on Jul 24^th, 2013, 5:25am

I was reading razavi's book where it was mentioned that " current source injects current into ground or draw current from VDD and only 1 terminal of current source is floating"

My question is if 1 terminal is floating how can the current flow as there has to be a loop ???

Title: Re: mosfet as current source
Post by aaron_do on Jul 24^th, 2013, 5:37am

I guess he means that the current is independent of the voltage, so the voltage can take on any value...

Aaron

Title: Re: mosfet as current source
Post by AnilReddy on Jul 25^th, 2013, 5:47am

Hi,

The loop will be closed by other circuits where this Source/Sink of current is used.

Bye,
Anil

Title: Re: mosfet as current source
Post by aman gupta on Jul 26^th, 2013, 7:00am

what is meant by floating terminal ??

Title: Re: mosfet as current source
Post by boe on Jul 26^th, 2013, 8:49am

aman gupta wrote on Jul 26^th, 2013, 7:00am:

what is meant by floating terminal ??

In this context it is a terminal which does not have a fixed voltage (e.g. ground, power supply, etc).
- B O E