AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164. Before I feed yet another $31 into the voracious maw of the IEEE, does anybody have a copy handy? Thanks Phil Hobbs
Paper on reducing 1/f noise in amplifiers
Started by ●May 5, 2015
Reply by ●May 5, 20152015-05-05
Am 05.05.2015 um 23:20 schrieb Phil Hobbs:> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164. Before I feed yet another $31 into the voracious maw of the IEEE, does anybody have a copy handy?No, but by now it should be common knowledge if it's any good. Places to go: www.rubiola.org nist.gov, search for Fred Walls, Ferre-Pikal, timefreq group, 1134.pdf "origin of 1/f PM and AM noise in Bipolar Junction Transistor Amplifiers"; there is more. regards, Gerhard
Reply by ●May 5, 20152015-05-05
I just looked at it. No special magic... Quote: "GOOD LOW-NOISE PERFORMANCE at low frequencies is difficult to achieve in an amplifier without resorting to careful selection of the input transistors. Such selection is, at best, an expensive process for discrete-component circuits and a nearly unobtainable luxury for monolithic integrated circuits. The circuit of Figure 1 has superior low-noise performance at low frequencies. It consists of a Darlington pair of transistors and a dc current source connected to the emitter of the input transistor. This current source allows the independent adjustment of the small-signal transconductance of the input transistor. When the transconductances of the two transistors are equal, the excess output noise is nulled. In a typical realization described below, the noise performance is an order of magnitude better than that of either transistor alone." They then show how to make a differential pair of the same circuit. Steve
Reply by ●May 5, 20152015-05-05
On 5/5/2015 6:29 PM, sroberts6328@gmail.com wrote:> I just looked at it. No special magic... > > Quote: > > "GOOD LOW-NOISE PERFORMANCE at low frequencies is difficult > to achieve in an amplifier without resorting to careful > selection of the input transistors. Such selection is, at best, > an expensive process for discrete-component circuits and > a nearly unobtainable luxury for monolithic integrated > circuits. The circuit of Figure 1 has superior low-noise performance > at low frequencies. It consists of a Darlington pair > of transistors and a dc current source connected to the > emitter of the input transistor. This current source allows > the independent adjustment of the small-signal transconductance > of the input transistor. When the transconductances > of the two transistors are equal, the excess output > noise is nulled. In a typical realization described below, the > noise performance is an order of magnitude better than that > of either transistor alone." > > They then show how to make a differential pair of the same circuit. > > Steve >I'm interested in reducing the 1/f noise of pHEMTs, which besides low V_A is their only vice. An order of magnitude improvement in the 1/f noise would reduce their noise corner from 10 MHz to 100 kHz, a fairly startling improvement. Of course the mechanism is different, so the BJT trick may well not work. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●May 6, 20152015-05-06
On 5/5/2015 5:20 PM, Phil Hobbs wrote:> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette > & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. > 164. Before I feed yet another $31 into the voracious maw of the > IEEE, does anybody have a copy handy? >Received a copy from the estimable John M in Scotland. Interesting bit of work, but only a couple of pages long--about $15 per page from the ever-generous IEEE. Thanks, John! Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●May 6, 20152015-05-06
Some Engineering student or professor on campus goes around exercising his freedom of speech. He pops up A4 posters reading: "IEEE Transactions on Opportunity Hoarding" Steve
Reply by ●May 6, 20152015-05-06
On Wed, 06 May 2015 01:57:48 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 5/5/2015 5:20 PM, Phil Hobbs wrote: >> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette >> & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. >> 164. Before I feed yet another $31 into the voracious maw of the >> IEEE, does anybody have a copy handy? >> > >Received a copy from the estimable John M in Scotland. Interesting bit >of work, but only a couple of pages long--about $15 per page from the >ever-generous IEEE. Thanks, John! > >Cheers > >Phil HobbsWhat annoys me is that virtually all of this research is funded by the taxpayer, so we get to pay twice :-( Maybe a lawsuit is in order? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Statistics means never having to say you are certain
Reply by ●May 6, 20152015-05-06
On Wed, 06 May 2015 06:56:19 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Wed, 06 May 2015 01:57:48 -0400, Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote: > >>On 5/5/2015 5:20 PM, Phil Hobbs wrote: >>> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette >>> & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. >>> 164. Before I feed yet another $31 into the voracious maw of the >>> IEEE, does anybody have a copy handy? >>> >> >>Received a copy from the estimable John M in Scotland. Interesting bit >>of work, but only a couple of pages long--about $15 per page from the >>ever-generous IEEE. Thanks, John! >> >>Cheers >> >>Phil Hobbs > >What annoys me is that virtually all of this research is funded by the >taxpayer, so we get to pay twice :-( > >Maybe a lawsuit is in order? > > ...Jim ThompsonThe abstracts are written to make it unclear whether the paper might be useful. You have to buy the whole thing to find out. It's better to assume that it's not useful, which is the general case. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 6, 20152015-05-06
Den onsdag den 6. maj 2015 kl. 16.09.39 UTC+2 skrev John Larkin:> On Wed, 06 May 2015 06:56:19 -0700, Jim Thompson > <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > > >On Wed, 06 May 2015 01:57:48 -0400, Phil Hobbs > ><pcdhSpamMeSenseless@electrooptical.net> wrote: > > > >>On 5/5/2015 5:20 PM, Phil Hobbs wrote: > >>> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette > >>> & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. > >>> 164. Before I feed yet another $31 into the voracious maw of the > >>> IEEE, does anybody have a copy handy? > >>> > >> > >>Received a copy from the estimable John M in Scotland. Interesting bit > >>of work, but only a couple of pages long--about $15 per page from the > >>ever-generous IEEE. Thanks, John! > >> > >>Cheers > >> > >>Phil Hobbs > > > >What annoys me is that virtually all of this research is funded by the > >taxpayer, so we get to pay twice :-( > > > >Maybe a lawsuit is in order? > > > > ...Jim Thompson > > The abstracts are written to make it unclear whether the paper might > be useful. You have to buy the whole thing to find out. It's better to > assume that it's not useful, which is the general case. >it's 2 pages with four graphs and two rough schematics here anyone can walk in to university library and see it for free, or if you are on a university network just download it -Lasse
Reply by ●May 6, 20152015-05-06
On 5/6/2015 10:24 AM, Lasse Langwadt Christensen wrote:> Den onsdag den 6. maj 2015 kl. 16.09.39 UTC+2 skrev John Larkin: >> On Wed, 06 May 2015 06:56:19 -0700, Jim Thompson >> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>> On Wed, 06 May 2015 01:57:48 -0400, Phil Hobbs >>> <pcdhSpamMeSenseless@electrooptical.net> wrote: >>> >>>> On 5/5/2015 5:20 PM, Phil Hobbs wrote: >>>>> AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette >>>>> & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. >>>>> 164. Before I feed yet another $31 into the voracious maw of the >>>>> IEEE, does anybody have a copy handy? >>>>> >>>> >>>> Received a copy from the estimable John M in Scotland. Interesting bit >>>> of work, but only a couple of pages long--about $15 per page from the >>>> ever-generous IEEE. Thanks, John! >>>> >>>> Cheers >>>> >>>> Phil Hobbs >>> >>> What annoys me is that virtually all of this research is funded by the >>> taxpayer, so we get to pay twice :-( >>> >>> Maybe a lawsuit is in order? >>> >>> ...Jim Thompson >> >> The abstracts are written to make it unclear whether the paper might >> be useful. You have to buy the whole thing to find out. It's better to >> assume that it's not useful, which is the general case. >> > > it's 2 pages with four graphs and two rough schematics > > here anyone can walk in to university library and see it for free, > or if you are on a university network just download it > > > -Lasse >Same here, but my spending an afternoon driving to the city and back would cost the customer a lot of 31 buckses. There's an outfit called DeepDyve that lets you take a squint at the paper for 6 bucks or so before buying it, iirc, which is better but still annoying. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
