18 Threads found on edaboard.com: Wilson Current Source
The wilson current source is particularly advantageous to use in the case of bipolar tech. There is no advantage for the case of MOSFETs. The explanation is given in more detail by Prof.Brodersen in his video lecture(EECS140 at ) when another person asked the same question as you did.
Analog Circuit Design :: 27.08.2004 14:17 :: v_naren :: Replies: 23 :: Views: 12918
I need to design a current source rated 1Amp for a battery charger i'm doing, i need to know what would be the best one, a simple wilson, a widlar, mos, bjt or something else altogether?
Should i use simple transistors or a transistor array and which ones u recommend?
It's for driving Dallas/Maxim Ds2711 circuit battery charger.
Hobby Circuits and Small Projects Problems :: 19.07.2005 17:10 :: Microemission :: Replies: 1 :: Views: 1482
In bipolar,we use wilson current mirror to get rid of the systematic error due to base current
but in CMOS,we don't have "gate current",then do we use wilson current mirror in CMOS?
if so, what's the benefit of using it?
Thanks in advance
Analog IC Design and Layout :: 30.10.2006 00:09 :: pugongying :: Replies: 11 :: Views: 3409
This is called wilson current source. The presence of MC4 is to boost output resistance of cascoded current source formed by MC5 and MC6 by gm4*(rc4//rc7).
The current goes through MC5 may not equal to Ibias, but is set by Vbias.
Analog Circuit Design :: 09.04.2007 13:11 :: bageduke :: Replies: 3 :: Views: 920
try using wilson current mirror as given in this link....
it uses isolation of load from current mirror and hence leads to better regulation...
Professional Hardware and Electronics Design :: 20.07.2007 16:37 :: A.Anand Srinivasan :: Replies: 1 :: Views: 1334
The wilson current mirror doesn't provide much advantage when using MOS. It's biggest strength is eliminating base current error when using BJT's.
However, here's how it functions in your configuration:
Assuming initially all devices are off, the following sequence of events will happen during start-up:
1) I4 will start increasing (...)
Analog IC Design and Layout :: 03.06.2008 07:07 :: gszczesz :: Replies: 4 :: Views: 684
the main thing of the all current sources to get constant wilson and normal sources, output current of the current source is equal to reference current. but in widlar it is not like that,output current less than the reference (...)
Electronic Elementary Questions :: 10.09.2012 15:19 :: rameshbalan :: Replies: 1 :: Views: 894
wilson current source?
Analog Circuit Design :: 22.08.2007 22:05 :: paraon00 :: Replies: 3 :: Views: 636
well, basically, any current source topology will do it. You might want to use a normal current source composed of two transistors or you might even want to try something more complicated like wilson or..... .
Please let me know if you want more help.
Analog Circuit Design :: 16.05.2008 23:12 :: Sadegh.j :: Replies: 10 :: Views: 2394
I'm studying current mirror right now and I'm wondering how do we choose between widlar, wilson and cascode current mirror?
Is there any disadvantages of using widlar/wilson current mirror in CMOS circuit? The textbook by Baker didn't even mention about these 2 current mirrors.
Analog Circuit Design :: 03.10.2008 06:25 :: lipkai :: Replies: 3 :: Views: 1190
You can use a bandgap reference to generate it.
I don't remember the name of the circuit but you can also use a a simple n-channel current mirror(1:N) with a resistor between the source and ground of N-size MOSFET. The load for both the transistors is a p-channel current-mirror load. I think it is some variation of (...)
Analog IC Design and Layout :: 04.07.2009 11:27 :: kishore2k4 :: Replies: 4 :: Views: 611
You can try using a different topology, such as wilson or Widlar current mirrors.
Or just a simple cascode.
Analog IC Design and Layout :: 19.09.2010 07:05 :: sharonma :: Replies: 3 :: Views: 1007
I am using NG Spice for simulating a current mirror circuit. In the circuit the MOSFET through which Iout flows has drain left open. How can i simulate the circuit and view the output current vs voltage graph..? Can i simulate improved wilson current mirrors in NG Spice. If not, please suggest any other open (...)
Analog Circuit Design :: 21.04.2013 12:41 :: mkpriya457 :: Replies: 6 :: Views: 372
I am an undergraduate student and I have a question regarding how to determine whether a node is AC ground.
For example, in simple current mirror, when doing the small signal analysis to find output resistance. The gate of the transistor at the output side is AC grounded. However in wilson current mirror, to find Rout, the gate (...)
Analog IC Design and Layout :: 24.09.2006 03:03 :: celeng :: Replies: 1 :: Views: 549
You can refer to some advanced current mirror configuration, such as wilson.
Analog Circuit Design :: 15.11.2006 02:54 :: adsl :: Replies: 6 :: Views: 593
This is the popular wilson mirror. This is negative feedback and can become unstable. Do a websearch to know more about it.
i think shd be no problem because only have one inversion in the loop or one gain stage and one dominant pole.
Analog Circuit Design :: 23.11.2008 23:48 :: surianova :: Replies: 4 :: Views: 740
I have to design a circuit that employs negative feedback to achieve the design
specifications shown below:
Closed-Loop current Gain = 15 A/A up to 10 MHz with 60 degrees of Phase Margin
Closed-Loop Input Resistance < 1 Ohm
Closed-Loop Output Resistance > 10 MOhm
Supply voltages VDD = 2.5 V and VSS = -2.5 V
driving the load of 1K and c
Analog Circuit Design :: 16.03.2009 23:44 :: edaoj :: Replies: 1 :: Views: 907
I have some questions about cmos comparator design.
I need to design a very low power comparator. The Vdd = 3.3V, Midband Gain ~55dB, GBW ~500KHz. The current needs to be as small as possible.
I plan to put the differential pair in subthreshold region and the rest of the transistors in strong inversion or moderate inversion.
Analog IC Design and Layout :: 22.12.2009 03:21 :: wandola :: Replies: 3 :: Views: 1101