SA5211 Просмотр технического описания (PDF) - Philips Electronics

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SA5211

Transimpedance amplifier (180 MHz)

Philips Electronics 

Philips Semiconductors

SA5211

Transimpedance amplifier (180 MHz)

strongly determined by the quiescent current of Q1, the feedback resistor RF, and the

bandwidth; however, it is not dependent upon the internal Miller-capacitance. The

measured wideband noise was 41 nA RMS in a 200 MHz bandwidth.

14. Dynamic range calculations

The electrical dynamic range can be defined as the ratio of maximum input current to

the peak noise current:

Electrical dynamic range, DE, in a 200 MHz bandwidth assuming IINMAX = 60 µA and

a wideband noise of IEQ = 41 nARMS for an external source capacitance of CS = 1 pF.

DE = (-(--MP---e--a-a--xk---.--n-i-n-o--p-i--su--e-t---cc---uu---rr--rr--ee---nn---tt-)-)

(5)

DE (dB) = 20 log(-(--6---20-----4×--1---1-1--0-0--–-–-6-9--)-)

(6)

DE(dB) = 20 log (-(--65---08-----µn----AA----)-)= 60db

(7)

In order to calculate the optical dynamic range the incident optical power must be

considered.

For a given wavelength λ;

Energy of one Photon = h--λ--c- watt sec (Joule)

Where h = Planck’s Constant = 6.6 × 10-34 Joule sec.

c = speed of light = 3 × 108 m/sec

c / λ = optical frequency

--P---

No. of incident photons/sec = -h-λ--c- where P = optical incident power

--P---

No. of generated electrons/sec = η × -h-λ--c-

where η = quantum efficiency

=

n----o---.---o---f---g---e---n---e--r--a---t--e--d-----e---l-e---c---t-r--o---n-----h---o---l--e----p---a--i--r--s-

no. of incident photons

9397 750 07427

Product specification

Rev. 03 — 07 October 1998

© Philips Electronics N.V. 2001. All rights reserved.

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