Vco Circuit Design. Below is the complete exponential converter that will be used in our vco engine to convert the input linear voltage into an exponential voltage where the voltage output doubles for every 1v increase in the input. Q2 is connected in the common base configuration.
The vco phase noise a number of design rules should be respected. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted. Caps of m1 and m2 including 4cgd cap of l1 input cap of next stage tuning range may be limited.
Also op amps multivibrator transistors 555 timers can also be utilised to build oscillating circuits.
This requires sound theoretical design followed by careful choice of all the components and then a good pcb layout. Behavioral spice model emulates vco 07 06 95 edn design ideas a behavioral model treats a circuit as a black box which you can describe using an equation or table. Listing 1 is a microsemi pspice behavioral model that simulates the operation of a voltage controlled oscillator vco. 13 vco type i to maximize tuning range we wish to minimize c1.
