Compound Op Amp Vco Driver

  
This circuit produces 5- to 25-V output to drive a VCO from a standard ± 15-V supply system. R7 and CI supply fr

equency compensation. Ql through Q3 form an inverting amplifier with a gain of two. Negative feedback through R2 closes the loop. This circuit can act as a an active load-log filter and directly drive a voltage-controlled oscillator.




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