wateror
Member level 4
bias voltage
I am designing a 64*64 pixel array driver circuits. Every pixel has a class ab amplifier in it. The question is how to design bias circuits for these amplifiers. It is better to mirror the current source at local area. But that will need 64*64 bias current source for the whole chip, which is impossible for layout. But if I just generate the bias voltage outside the pixel array, then collect it to all the bias circuirts inside the pixel. That may cause too much mismatch for the currents. So is there any better solution?
I am designing a 64*64 pixel array driver circuits. Every pixel has a class ab amplifier in it. The question is how to design bias circuits for these amplifiers. It is better to mirror the current source at local area. But that will need 64*64 bias current source for the whole chip, which is impossible for layout. But if I just generate the bias voltage outside the pixel array, then collect it to all the bias circuirts inside the pixel. That may cause too much mismatch for the currents. So is there any better solution?