Take a look at the circuit(BGR)

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liuguojia387

Joined: 08 Aug 2009
Posts: 16

29 Oct 2009 12:51 Take a look at the circuit(BGR)

I found the circuit in a paper.But one of my collaegues pointed out it has one fault about mismatch.

I want to know the difference betweeen the circuit and the typical BGR which use an amplifier to assure the equality ?

Who can give me advantages and disadvantages of the two circuits?

thank you for your answers!

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mikersia

Joined: 19 Feb 2009
Posts: 41
Helped: 2

29 Oct 2009 16:00 Take a look at the circuit(BGR)

Advantage of this circuit is higher power supply rejection (PSR) due to embedded voltage regulation. But be carefull with it implementation,- I met on practice with it unsimulated unstability. Suppose that AC model of bipolars wasn't fully correct,- this unfortunately is typical for many manufacturers.

liuguojia387

Joined: 08 Aug 2009
Posts: 16

29 Oct 2009 16:07 Re: Take a look at the circuit(BGR)

mikersia wrote:

I'm sorry,but what is unsimulated unstability?

cheinkuos

Joined: 31 Oct 2008
Posts: 1

02 Nov 2009 3:48 Re: Take a look at the circuit(BGR)

what papaer do you research and why you pick up this schematic of BGR?
i looks so complex~~

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liuguojia387

Joined: 08 Aug 2009
Posts: 16

02 Nov 2009 4:54 Re: Take a look at the circuit(BGR)

cheinkuos wrote:

what papaer do you research and why you pick up this schematic of BGR?
i looks so complex~~

I refer to this paper .

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mikersia

Joined: 19 Feb 2009
Posts: 41
Helped: 2

02 Nov 2009 10:08 Take a look at the circuit(BGR)

Unsimulated unstability was concluded in fact, that the manufactured BGR structure had oscillations, which didn't reproduced by any simulations, including extracting all layout parasitics.