Transimpedance Amplifer (TIA) & photodiode questions

[wylee]

tia photodiode

I have a few questions about TIA and photodiode,

TIA
1. what is the ideal input impedance and output impedance of such circuit?
2. as I recalled, classical TIA has a resistive feedback to boost BW, but reduces Gain. If I designed a TIA using RGC structure without resistive feedback, would there be a problem? (like oscillations or unstable gain?)
3. How to measure 'Sensitivity (dBm) of TIA using HSPICE or Cadence?
4. How to measure 'input referred noise' of TIA using HSPICE or Cadence?

Photodiode
1. can anyone give me a example of practical photodiode model/schematics in the current industry?
2. what is the typical photodiode capacitance (Cpd) for 3.2Gbps applications nowadays? 0.6pF? 1pF?
3. what is the typical dark current (when photodiode is not receiving any data)? 1nA? 5uA? 15uA?

~ :!: any diagrams or sample datasheet would be very helpful...

 

[mipedja]

transimpedance

2. Shunt feedback configuration with resistor Rf is a good compromise between bandwidth, and noise.
As you know it is good to have higher Rf as you can, than you have higher TIA gain, but this is limited to amplifier GainBandwidth product, which is technology dependant.
Instead of Rf it is better if you use NMOS in triode region (much smaller parasitic capacitance).

4. I thinh it should be Vnoise rms at the output divided by TIA gain @0 Hz.

 

[alastair41]

photodiode tia

1. It is application specific. There is no such a circuit can fit all.

 

[flatulent]

burr brown transimpedance photodiodo

There is a famous book Photodiode Amplifiers by Jerald Graeme that covers this topic. The Burr Brown web site has application notes derived from chapters of this book.

 

[wylee]

tia photodiode amplifier hamamatsu

flatulent,
do you have a link or ebook for the book u mentioned?

 

[Puppet1]

tia design for photodiode

I posted this book:

Broadband Circuits for Optical Fiber Communication

in the IEEE Papers, Study Papers section, has details on TIA design and other Optical circuits.

As for measurement in Cadence, I have done these circuits in ADS, and I can send documents about doing measurements for them in ADS.

 

[penghan]

tia photo diode

I have Photodiode Amplifier.
It is more about theory,and will be very usefull.

 

[wylee]

tia photodiode to

penghan, do u have a link to the book "Photodiode Amplifier"?

 

[penghan]

example of pspice photdiode model

Sorry,i just borrow it from library.
The book is published in 1996 and i don't know if there is a ebook.

 

[penghan]

noise tia photodiode

I posted this book:

Broadband Circuits for Optical Fiber Communication

in the IEEE Papers, Study Papers section, has details on TIA design and other Optical circuits.

As for measurement in Cadence, I have done these circuits in @DS, and I can send documents about doing measurements for them in @DS.

This book is excellent,too.

 

[biobartman]

transimpedance gain spice

Other good links to information about photodiode and amplification circuits can be found at
**broken link removed**
and
**broken link removed**
and
**broken link removed**

A promising article about a PSPICE photodiode model is here
http://www.nsti.org/procs/MSM2001/7/T51.19
or at
**broken link removed**

biobartman

 

[v_naren]

hamamatsu pspice



this book will be of great help
trust me!

 

[PONDERBOY]

tia input referred noise

do there have any example?

 

[v_naren]

spice model hamamatsu photodiode

yes there are examples

 

[owomax]

About TIA bandwidth

Please everyone, I need a help about something. I want to know if TIA bandwidth increase can degrades BER performance of optical OFDM systems?