STOIKOV
Full Member level 4
Biasing mixer and VCO
I will be characterizing a mixer and a VCO (900MHz) and have some doubts about biasing. I need the following voltages :
- 3.3V and 5V for VDD purposes
- 1.2V and 2.56V for biasing, applied in MOS gates
- variable 0-5V to adjust VCO frequency, applied in MOS gates
My plan is to use a battery and get the desired voltages through low-noise low-dropout regulators, placed in a PCB.
I've read that RF chokes are used to pass DC to a circuit and suppress RF from the circuit. My questions are :
- Are chokes needed in this work frequency, or it's not critical ?
- Are chokes needed in all voltages described above ?
- Would I need an RF choke per DC output ?
- How will be a simple way to implement a choke ? inductor, inductor + shunt capacitor, inductor + resistor + shunt capacitor ?
- What about the component values (L,C) ?
thanks !
I will be characterizing a mixer and a VCO (900MHz) and have some doubts about biasing. I need the following voltages :
- 3.3V and 5V for VDD purposes
- 1.2V and 2.56V for biasing, applied in MOS gates
- variable 0-5V to adjust VCO frequency, applied in MOS gates
My plan is to use a battery and get the desired voltages through low-noise low-dropout regulators, placed in a PCB.
I've read that RF chokes are used to pass DC to a circuit and suppress RF from the circuit. My questions are :
- Are chokes needed in this work frequency, or it's not critical ?
- Are chokes needed in all voltages described above ?
- Would I need an RF choke per DC output ?
- How will be a simple way to implement a choke ? inductor, inductor + shunt capacitor, inductor + resistor + shunt capacitor ?
- What about the component values (L,C) ?
thanks !