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Q&A Is a BJT 3-transistor Wilson mirror faster than a simple mirror?

My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations. A mirror set up to switch a current, and there ...

1 answer  ·  posted 3y ago by Pete W‭  ·  edited 9mo ago by Lorenzo Donati‭

#19: Post edited by user avatar Lorenzo Donati‭ · 2023-08-09T21:22:14Z (9 months ago)
Retagged.
#18: Post edited by user avatar Lorenzo Donati‭ · 2023-08-09T21:21:35Z (9 months ago)
Retagged.
#17: Post edited by user avatar Pete W‭ · 2021-01-29T22:00:03Z (about 3 years ago)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![image-1](https://electrical.codidact.com/uploads/8XcMwQogob4VqBGd412aQuWB)
  • ![image-2](https://electrical.codidact.com/uploads/bUdBa7NrccrcmCCga3oJVvVG)
  • My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![image-1](https://electrical.codidact.com/uploads/8XcMwQogob4VqBGd412aQuWB)
  • ![image-2](https://electrical.codidact.com/uploads/bUdBa7NrccrcmCCga3oJVvVG)
#16: Post edited by user avatar Pete W‭ · 2021-01-29T21:46:33Z (about 3 years ago)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![image-1](https://electrical.codidact.com/uploads/pgLYpRZ49nW3mjkNkYUi4wu8)
  • ![image-2](https://electrical.codidact.com/uploads/bUdBa7NrccrcmCCga3oJVvVG)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![image-1](https://electrical.codidact.com/uploads/8XcMwQogob4VqBGd412aQuWB)
  • ![image-2](https://electrical.codidact.com/uploads/bUdBa7NrccrcmCCga3oJVvVG)
#15: Post edited by user avatar Pete W‭ · 2021-01-29T21:44:29Z (about 3 years ago)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![image-1](https://electrical.codidact.com/uploads/pgLYpRZ49nW3mjkNkYUi4wu8)
  • ![image-2](https://electrical.codidact.com/uploads/bUdBa7NrccrcmCCga3oJVvVG)
#14: Post edited by user avatar Pete W‭ · 2021-01-29T21:41:31Z (about 3 years ago)
  • Is a BJT half-Wilson mirror faster than a simple mirror?
  • Is a BJT 3-transistor Wilson mirror faster than a simple mirror?
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • 3-transistor Wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
#13: Post edited by user avatar Pete W‭ · 2021-01-29T21:40:22Z (about 3 years ago)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
#12: Post edited by user avatar Pete W‭ · 2021-01-29T21:39:27Z (about 3 years ago)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero current each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
#11: Post edited by user avatar Pete W‭ · 2021-01-29T21:32:33Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror input is ramping up and down from near zero current each time (for other reasons) -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the constraint in the scenario here is that the mirror ramps all the way up and down each time)
  • My question is trying to understand if there is an effect on the switching time, between the following configurations.
  • A mirror set up to switch a current, and there is switching on the input side of the mirror input (for other reasons), meaning the simple mirror's base voltage must ramp up and down from near zero current each time. In this configuration, is there a speed benefit to the
  • (half?)-wilson mirror? Talking about discrete components, output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration-with-simple-mirror](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • ![simlified-illustration-with-half-wilson](https://electrical.codidact.com/uploads/ZJXsyrgy78eAYtMRBUzUcy3a)
#10: Post edited by user avatar Pete W‭ · 2021-01-29T15:09:58Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror input is ramping up and down from near zero current each time (for other reasons) -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror input is ramping up and down from near zero current each time (for other reasons) -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the constraint in the scenario here is that the mirror ramps all the way up and down each time)
#9: Post edited by user avatar Pete W‭ · 2021-01-29T15:09:15Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror output is ramping up and down from near zero current each time (for other reasons), output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror input is ramping up and down from near zero current each time (for other reasons) -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? output 470pF, ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
#8: Post edited by user avatar Pete W‭ · 2021-01-29T15:08:18Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror is ramping up from near zero current each time, output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? (1 MHz ballpark)
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror output is ramping up and down from near zero current each time (for other reasons), output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? ~1 MHz switch freq.
  • ![simplified-illustration](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
#7: Post edited by user avatar Pete W‭ · 2021-01-29T15:06:34Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror is ramping up from near zero current each time, output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? (1 MHz ballpark)?
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps up from scratch each time)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror is ramping up from near zero current each time, output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? (1 MHz ballpark)
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps all the way up and down each time)
#6: Post edited by user avatar Pete W‭ · 2021-01-29T15:05:25Z (about 3 years ago)
  • If a simple BJT current mirror has input current switching on and off, and output going to 470pF capacitor -- then is there a speed benefit to the wilson mirror? (1 MHz ballpark)?
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration)
  • If a simple BJT current mirror has input current switching on and off, and the setup is such that the mirror is ramping up from near zero current each time, output going to 470pF -- then is there a speed benefit to the
  • (half?)-wilson mirror (not shown)? (1 MHz ballpark)?
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration... the point is the scenario here is that the mirror ramps up from scratch each time)
#5: Post edited by user avatar Pete W‭ · 2021-01-29T15:02:29Z (about 3 years ago)
  • If a BJT current mirror has input current switching on and off, and output going to 470pF capacitor -- then is there a speed benefit to the wilson mirror? (1 MHz ballpark)
  • If a simple BJT current mirror has input current switching on and off, and output going to 470pF capacitor -- then is there a speed benefit to the wilson mirror? (1 MHz ballpark)?
  • ![Image alt text](https://electrical.codidact.com/uploads/TyHJRdH3ipq2ELVSwxYQ4Kac)
  • (conceptual illustration)
#4: Post edited by user avatar Pete W‭ · 2021-01-29T14:56:43Z (about 3 years ago)
  • If a BJT current mirror has input current switching on and off, and output going to low impedance (capacitor) -- then is there a speed benefit to wilson mirror? (1 MHz ballpark)
  • If a BJT current mirror has input current switching on and off, and output going to 470pF capacitor -- then is there a speed benefit to the wilson mirror? (1 MHz ballpark)
#3: Post edited by user avatar Pete W‭ · 2021-01-29T14:54:15Z (about 3 years ago)
  • If a BJT current mirror has input current switching on and off, and output going to low impedance (capacitor) -- then is there a speed benefit to wilson mirror?
  • If a BJT current mirror has input current switching on and off, and output going to low impedance (capacitor) -- then is there a speed benefit to wilson mirror? (1 MHz ballpark)
#2: Post edited by user avatar Pete W‭ · 2021-01-29T14:53:28Z (about 3 years ago)
  • Is a BJT half-Wilson mirror faster than a simple mirror
  • Is a BJT half-Wilson mirror faster than a simple mirror?
#1: Initial revision by user avatar Pete W‭ · 2021-01-29T14:52:55Z (about 3 years ago)
Is a BJT half-Wilson mirror faster than a simple mirror
If a BJT current mirror has input current switching on and off, and output going to low impedance (capacitor) -- then is there a speed benefit to wilson mirror?