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18 Threads found on 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.
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. Datasheet (...)
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
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.
try using wilson current mirror as given in this link.... it uses isolation of load from current mirror and hence leads to better regulation...
For a normal current source , we first have a current , then the current flows through a dioded connected mos and generates a voltage vx, so vx makes M0 generate a current. But for a wilson current mirror, how does it generates vy and vz ? Only formula forces these two (...)
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 (...)
wilson current source? help me~ thanks
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. Cheers
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.
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 (...)
thanks, sharonma, but I think wilson is the same as cascode when refer to output impedance. hi,kgl,you really remind me of the source degeneration,thanks a lot
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 (...)
Hi all, 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 (...)
You can refer to some advanced current mirror configuration, such as wilson.
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.
Hi, 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
Hello All, 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.