Hi everyone!
I have some questions to scale the resistances of a differential amplifier with passive load. I will present the circuit:
The objective is to scale the circuit of the figure to obtain a collector current of 5 mA transistor Q3. My first step was to create a current source of 5mA. I used a diode and a BJT and tested in a simulator, it is okay.
Now my question is how to scale the resistors R1 and R2.
Things that I know:
vb = 0
vbe = vb-ve = 0.7 -> v =- 0.7
(12-vc) / R1 = ic -> VC1 = 12 - ic1 * R1 ...
Can someone tell me how I can get some value of R1 and R2 only with this information?
I don't ask for resolutions, I really prefer a explication of the operation or a method to resolve my problem than expressions with values, etc, etc because I'm not very comfortable with this.
I appreciate any clarification.
I have some questions to scale the resistances of a differential amplifier with passive load. I will present the circuit:
The objective is to scale the circuit of the figure to obtain a collector current of 5 mA transistor Q3. My first step was to create a current source of 5mA. I used a diode and a BJT and tested in a simulator, it is okay.
Now my question is how to scale the resistors R1 and R2.
Things that I know:
vb = 0
vbe = vb-ve = 0.7 -> v =- 0.7
(12-vc) / R1 = ic -> VC1 = 12 - ic1 * R1 ...
Can someone tell me how I can get some value of R1 and R2 only with this information?
I don't ask for resolutions, I really prefer a explication of the operation or a method to resolve my problem than expressions with values, etc, etc because I'm not very comfortable with this.
I appreciate any clarification.