Choosing voltage opamp

Article View: sci.electronics.design

Article #2053

Back to sci.electronics.design Previous Next

#2053

From: Vitaliy
Date: Sat, 23 Sep 2006 17:05

21 lines
1997 bytes

Hello,

I'm looking to add the 2nd stage to photodiode transimpedance
amplifier. All I want to achieve by 2nd stage is voltage gain and
capability to drive 50 Ohm loads. The first stage is OPA657.

1) a) Given power supply for opamp +-5V, should I select the opamp that
has Io,max=>200mA. I do expect Vpeak-to-peak,output to be 10V.
   b) Is that output current achievable only at maximum supply voltage,
or as long as

2) I need to get an opamp with maximum input impedance (well, anything
>=1MOhm will do it). Should I get the one with JFET-input? Or any voltage amplifier will do the job?

3) What is Iq per channel(Max)(mA)?

4) Would SOIC packaging be better in general? Given that pcb layout is
optimized.

Thanks in advance,
Vitaliy

Technical Details

Message-ID: <1159031128.442881.267560@m7g2000cwm.googlegroups.com>

Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!m7g2000cwm.googlegroups.com!not-for-mail

Show Full Headers

Complete Article Headers

X-Google-Thread: 112d1e,c037ff6b3e0ae32c,start
X-Google-Thread: 111d0a,c037ff6b3e0ae32c,start
X-Google-Thread: 103407,c037ff6b3e0ae32c,start
X-Google-Attributes: gid112d1e,gid111d0a,gid103407,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!m7g2000cwm.googlegroups.com!not-for-mail
From: "Vitaliy" <vmykhayl@ee.ryerson.ca>
Newsgroups: sci.electronics.design,sci.electronics.basics,aus.electronics
Subject: Choosing voltage opamp
Date: 23 Sep 2006 10:05:28 -0700
Organization: http://groups.google.com
Lines: 22
Message-ID: <1159031128.442881.267560@m7g2000cwm.googlegroups.com>
NNTP-Posting-Host: 69.194.63.24
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Trace: posting.google.com 1159031132 10656 127.0.0.1 (23 Sep 2006 17:05:32 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sat, 23 Sep 2006 17:05:32 +0000 (UTC)
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; MRA 4.2 (build 01102); .NET CLR 1.1.4322),gzip(gfe),gzip(gfe)
Complaints-To: groups-abuse@google.com
Injection-Info: m7g2000cwm.googlegroups.com; posting-host=69.194.63.24;
   posting-account=y8LvZQ0AAAAaJu-ufjWjKg4Mvxudys0H